text:
Office of Scientific and Technical Information
Tapping into Wave and Tidal Ocean Power: 15% Water Power by 2030 |
Energy.gov (U.S. Department of Energy (DOE)) Indexed Site
Tapping into Wave and Tidal Ocean Power: 15% Water Power by 2030 Tapping into Wave and Tidal Ocean Power: 15% Water Power by 2030 Tapping into Wave and Tidal Ocean Power: 15% Water Power by 2030 January 27, 2012 - 11:30am Addthis A map generated by Georgia Tech's tidal energy resource database shows mean current speed of tidal streams. The East Coast, as shown above, has strong tides that could be tapped to produce energy. | Photo courtesy of Georgia Institute of Technology A map generated by Georgia Tech's tidal energy resource database shows mean current speed of tidal streams. The East Coast, as shown above, has strong tides that could be tapped to produce energy. | Photo courtesy of Georgia Institute of Technology Hoyt Battey Water Power Market Acceleration and Deployment Team Lead, Wind and Water Power Program
Observation of the Power Spectrum of Ocean Waves Using a Cloverleaf Buoy
Science Conference Proceedings (OSTI)
The power spectra of typical sets of ocean wave data obtained in the open ocean using a cloverleaf buoy are analyzed to determine an idealized form for the spectrum of ocean surface waves. It is shown that most of the single-peaked spectra ...
Hisashi Mitsuyasu; Fukuzo Tasai; Toshiro Suhara; Shinjiro Mizuno; Makoto Ohkusu; Tadao Honda; Kunio Rikiishi
MHK Technologies/Ocean Wave Power Spar Buoy Engine | Open Energy
Open Energy Info (EERE)
Spar Buoy Engine Spar Buoy Engine < MHK Technologies Jump to: navigation, search << Return to the MHK database homepage Ocean Wave Power Spar Buoy Engine.jpg Technology Profile Primary Organization Functional Design Engineering Inc Technology Resource Click here Wave Technology Type Click here Point Absorber - Submerged Technology Readiness Level Click here TRL 4 Proof of Concept Technology Description A long period spar buoy supports a subsurface flow augmentor The augmentor directs water from the wave s submarine flow field to a free prime mover piston The prime mover is decoupled from the machine s PTO during times in the wave s cycle when there is little power available for conversion Wave energy is stored in the device until the is enough flow magnetude that power take off can efficiently take place Power can be taken off as high pressure water crankshaft torque or directly as DC electricity
Riding the Waves: Harnessing Ocean Wave Energy through ...
... The opportunities for ocean wave power to become a new, reliable and clean source of renewable energy will be discussed, as well as activities of ...
The Wirewalker: A Vertically Profiling Instrument Carrier Powered by Ocean Waves
Ocean wave energy is used to drive a buoyant instrument platform down a wire suspended from a surface float. At the lower terminus of the profiling range, the cam that rectifies wave vertical motion is released and the package, termed the ...
R. Pinkel; M. A. Goldin; J. A. Smith; O. M. Sun; A. A. Aja; M. N. Bui; T. Hughen
Oceanic Internal Waves Are Not Weak Waves
It is shown that the oceanic internal wave field is too energetic by roughly two orders of magnitude to be treated theoretically as an assemblage of weakly interacting waves. This may be seen both from recent weak wave theoretical calculations ...
Greg Holloway
Ocean Tidal and Wave Energy
First published in 2000, the annual Renewable Energy Technical Assessment Guide (TAG-RE) provides a consistent basis for evaluating the economic feasibility of renewable generation technologies. This excerpt from the 2005 TAG-RE addresses ocean tidal and wave energy conversion technologies, which offer promise for converting the significant energy potential available in ocean tidal currents and waves to electricity in the future.
Green Ocean Wave Energy | Open Energy Information
Ocean Wave Energy Jump to: navigation, search Name Green Ocean Wave Energy Sector Marine and Hydrokinetic Website http:http:www.greenoceanwa Region United States LinkedIn...
Wave Power: Destroyer of Rocks; Creator of Clean Energy
E E PG&E Wave Energy Wave Energy Federal Utility Partnership Federal Utility Partnership Working Group Meeting Working Group Meeting Wave Energy Wave Energy Development Development Ontario, CA Ontario, CA November 18 November 18- -19, 200 19, 2009 9 Donald G. Price Donald G. Price Senior Consulting Scientist, PG&E Senior Consulting Scientist, PG&E Wave Power Overview Wave Power Overview * * What is Wave Power? What is Wave Power? o o Wave power or wave energy is the energy contained in ocean Wave power or wave energy is the energy contained in ocean o o Wave power or wave energy is the energy contained in ocean Wave power or wave energy is the energy contained in ocean waves that is converted into electricity by various means. waves that is converted into electricity by various means. o o It is a clean, renewable energy resource capable of being utilized
Wave Power Demonstration Project at Reedsport, Oregon
SciTech Connect
Ocean wave power can be a significant source of large?scale, renewable energy for the US electrical grid. The Electrical Power Research Institute (EPRI) conservatively estimated that 20% of all US electricity could be generated by wave energy. Ocean Power Technologies, Inc. (OPT), with funding from private sources and the US Navy, developed the PowerBuoy? to generate renewable energy from the readily available power in ocean waves. OPT's PowerBuoy converts the energy in ocean waves to electricity using the rise and fall of waves to move the buoy up and down (mechanical stroking) which drives an electric generator. This electricity is then conditioned and transmitted ashore as high?voltage power via underwater cable. OPT's wave power generation system includes sophisticated techniques to automatically tune the system for efficient conversion of random wave energy into low cost green electricity, for disconnecting the system in large waves for hardware safety and protection, and for automatically restoring operation when wave conditions normalize. As the first utility scale wave power project in the US, the Wave Power Demonstration Project at Reedsport, OR, will consist of 10 PowerBuoys located 2.5 miles off the coast. This U.S. Department of Energy Grant funding along with funding from PNGC Power, an Oregon?based electric power cooperative, was utilized for the design completion, fabrication, assembly and factory testing of the first PowerBuoy for the Reedsport project. At this time, the design and fabrication of this first PowerBuoy and factory testing of the power take?off subsystem are complete; additionally the power take?off subsystem has been successfully integrated into the spar.
Mekhiche, Mike [Principal Investigator] [Principal Investigator; Downie, Bruce [Project Manager] [Project Manager
Ocean Renewable Power Company LLC | Open Energy Information
Ocean Renewable Power Company LLC Jump to: navigation, search Name Ocean Renewable Power Company LLC Place Portland, Maine Zip 4101 Sector Ocean, Renewable Energy Product Ocean...
Instability Waves in the Equatorial Atlantic Ocean
Evidence is presented for the generation of planetary waves by barotropic instability within the cyclonic shear region of the Atlantic Ocean's South Equatorial Current (SEC). Immediately following the springtime intensification of the southeast ...
Robert H. Weisberg; Thomas J. Weingartner
Observations of Steep Wave Statistics in Open Ocean Waters
A new wavelet analysis methodology is proposed to estimate the statistics of steep waves. The method is applied to open ocean wave height data from the Southern Ocean Waves Experiment (1992) and from a field experiment conducted at Duck, North ...
Nicholas Scott; Tetsu Hara; Edward J. Walsh; Paul A. Hwang
MHK Technologies/Ocean Wave Air Piston | Open Energy Information
Piston Piston < MHK Technologies Jump to: navigation, search << Return to the MHK database homepage Ocean Wave Air Piston.jpg Technology Profile Primary Organization Green Ocean Wave Energy Technology Resource Click here Wave Technology Type Click here Attenuator Technology Readiness Level Click here TRL 4 Proof of Concept Technology Description The OWAP captures power by continually raising or lowering a float which in turn raises or lowers one side of a lever arm about a stationary pivot point This therby raises or lowers a piston which is attached to the opposite side of the lever arm through a cylinder which in turn causes large volumes of air to move This air is funneled through drive turbines to produce power Mooring Configuration Monopile or platfrom
Sensitivity of the Ocean State to Lee Wave Driven Mixing
Diapycnal mixing plays a key role in maintaining the ocean stratification and meridional overturning circulation (MOC). In the ocean interior, it is mainly sustained by breaking internal waves. Two important classes of internal waves are internal ...
Angelique Melet; Robert Hallberg; Sonya Legg; Maxim Nikurashin
The Fleet Numerical Oceanography Center Global Spectral Ocean Wave Model
The Spectral Ocean Wave Model (SOWM) has been an operational product at Fleet Numerical Oceanography Center since the mid 1970s; the Global Spectral Ocean Wave Model (GSOWM) was developed to replace it. An operational test of GSOWM, using buoy, ...
R. M. Clancy; J. E. Kaitala; L. F. Zambresky
wave power density | OpenEI
power density power density Dataset Summary Description This project estimates the naturally available and technically recoverable U.S. wave energy resources, using a 51-month Wavewatch III hindcast database developed especially for this study by National Oceanographic and Atmospheric Administration's (NOAA's) National Centers for Environmental Prediction. For total resource estimation, wave power density in terms of kilowatts per meter is aggregated across a unit diameter circle. Source Electric Power Research Institute (EPRI) Date Released December 05th, 2011 (2 years ago) Date Updated Unknown Keywords EPRI MHK NREL ocean Virginia Tech wave wave power density Data application/pdf icon Download Full Report (pdf, 8.8 MiB) Quality Metrics Level of Review Some Review Comment
Examination of the Impact of a Coupled Atmospheric and Ocean Wave System. Part II: Ocean Wave Aspects
A coupled atmospheric and ocean wave system has been developed to study the impact of changes of surface roughness length induced by ocean waves. A two-way coupling between a mesoscale atmospheric model, MC2, and an oceanic wave model, a regional ...
R. Lalbeharry; J. Mailhot; S. Desjardins; L. Wilson
Simultaneous Measurement of Ocean Winds and Waves with an Airborne Coherent Real Aperture Radar
A coherent, X-band airborne radar has been developed to measure wind speed and direction simultaneously with directional wave spectra on the ocean. The coherent real aperture radar (CORAR) measures received power, mean Doppler shifts, and mean ...
William J. Plant; William C. Keller; Kenneth Hayes
MHK Technologies/Ocean Powered Compressed Air Stations | Open Energy
Powered Compressed Air Stations Powered Compressed Air Stations < MHK Technologies Jump to: navigation, search << Return to the MHK database homepage Ocean Powered Compressed Air Stations.png Technology Profile Primary Organization Wave Power Plant Inc Technology Resource Click here Wave Technology Type Click here Point Absorber - Submerged Technology Readiness Level Click here TRL 4 Proof of Concept Technology Description The Ocean Powered Compressed Air Station is a point absorber that uses an air pump to force air to a landbased generator The device only needs 4m water depth and electricity production fluctations through storing energy at a constant air pressure Technology Dimensions Device Testing Date Submitted 13:16.5 << Return to the MHK database homepage Retrieved from
An Assessment of Wave Observations from Ships in Southern Oceans
Observations of wind waves and swell from ship reports are investigated. Comparisons are made between estimates of wave parameters made from ships in southern oceans by calculating correlations as a function of ship separation, and analyzing the ...
A. K. Laing
Estimating Internal Wave Energy Fluxes in the Ocean
Energy flux is a fundamental quantity for understanding internal wave generation, propagation, and dissipation. In this paper, the estimation of internal wave energy fluxes u?p? from ocean observations that may be sparse in either time or depth ...
Jonathan D. Nash; Matthew H. Alford; Eric Kunze
Observing Ocean Surface Waves with GPS-Tracked Buoys
Surface-following buoys are widely used to collect routine ocean wave measurements. While accelerometer and tilt sensors have been used for decades to measure the wave-induced buoy displacements, alternative global positioning system (GPS) sensor ...
T. H. C. Herbers; P. F. Jessen; T. T. Janssen; D. B. Colbert; J. H. MacMahan
Wave Breaking and Ocean Surface Layer Thermal Response
The effect of breaking waves on ocean surface temperatures and surface boundary layer deepening is investigated. The modification of the Mellor–Yamada turbulence closure model by Craig and Banner and others to include surface wave breaking ...
George Mellor; Alan Blumberg
New Wave Power Project In Oregon | Department of Energy
Wave Power Project In Oregon Wave Power Project In Oregon New Wave Power Project In Oregon June 17, 2011 - 3:12pm Addthis Mike Reed Water Power Program Manager, Water Power Program What does this project do? Promises to add tremendous value to the wave energy industry, reinforcing utility-scale viability, collecting ground-breaking environmental impact data and exploring avenues for cost reduction. Has issued localized manufacturing contracts for the PB150 to several Oregon companies. If you've ever been surfing, or gone swimming in choppy water, you've experienced first-hand the striking power of waves. In fact, further offshore, wave activity becomes even more powerful, making it an excellent resource for generating clean, renewable energy. That's exactly what the Department of Energy and its partner Ocean Power Technologies (OPT) are
Ocean Renewable Power Company | Open Energy Information
Power Company Power Company Jump to: navigation, search Name Ocean Renewable Power Company LLC Place Portland, Maine Zip 4101 Sector Ocean, Renewable Energy Product Ocean Renewable Power Company, LLC was founded in 2004 for the purpose of generating reliable, competitive, emission-free electricity from the energy resources of the oceans. Coordinates 45.511795°, -122.675629° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":45.511795,"lon":-122.675629,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}
Turbine speed control for an ocean wave energy conversion system
In this work, a hydraulic turbine speed governor is proposed in view of its application in an isolated electric generation system based on an ocean wave energy converter (WEC). The proposed strategy is based on cascade closed-loop control combined with ... Keywords: Pelton turbine, cascade control, feedforward control, ocean wave energy, speed governor
Paula B. Garcia-Rosa; José Paulo V. S. Cunha; Fernando Lizarralde
The Antarctic Circumpolar Wave: A Beta Effect in Ocean–Atmosphere Coupling over the Southern Ocean
The Antarctic circumpolar wave (ACW) is a nominal 4-yr climate signal in the ocean–atmosphere system in the Southern Ocean, propagating eastward at an average speed of 6–8 cm s?1, composed of two waves taking approximately 8 years to circle the ...
Warren B. White; Shyh-Chin Chen; Ray G. Peterson
Energy Department Releases New Energy 101 Video on Ocean Power | Department
Energy Department Releases New Energy 101 Video on Ocean Power Energy Department Releases New Energy 101 Video on Ocean Power Energy Department Releases New Energy 101 Video on Ocean Power April 30, 2013 - 12:40pm Addthis See how marine and hydrokinetic technologies harness the energy of the ocean's waves, tides, and currents and convert it into electricity to power our homes, buildings and cities. Eric Barendsen Energy Technology Program Specialist, Office of Energy Efficiency and Renewable Energy FIND OUT MORE Read about the Energy Department's assessments of wave and tidal energy resources. You've probably seen water at work generating electricity at dams and other hydropower facilities in your region. But an emerging clean energy technology called marine and hydrokinetic (MHK) energy -- or ocean power -- uses water to generate electricity in a different way, and has yet to get
Energy 101 Video on Ocean Power Energy 101 Video on Ocean Power Energy Department Releases New Energy 101 Video on Ocean Power April 30, 2013 - 12:40pm Addthis See how marine and hydrokinetic technologies harness the energy of the ocean's waves, tides, and currents and convert it into electricity to power our homes, buildings and cities. Eric Barendsen Energy Technology Program Specialist, Office of Energy Efficiency and Renewable Energy FIND OUT MORE Read about the Energy Department's assessments of wave and tidal energy resources. You've probably seen water at work generating electricity at dams and other hydropower facilities in your region. But an emerging clean energy technology called marine and hydrokinetic (MHK) energy -- or ocean power -- uses water to generate electricity in a different way, and has yet to get
Modeling the Propagation, Breaking and Drift of Ocean Surface Wave
E-Print Network (OSTI)
A new model other than the classical ones given by Airy, Stokes and Gerstner for the ocean surface wave is constructed. It leads to new understandings for the wave mechanisms: (1) A wave with bigger amplitude or smaller steepness travels faster; (2) The wave breaks when the front angle is bigger than 46.3 degree; (3) The magnitude of the wave drift should be smaller than that of the known Stokes drift.
Jin-Liang Wang
Global ocean wind power sensitivity to surface layer stability
power distribution over the ocean, Geophys. Res. Lett. , 35,of wind speed over the ocean, J. Appl. Meteorol. , 25,and heat flux over the open ocean in gale force winds, J.
Capps, Scott B; Zender, Charles S
Long-Wave Trapping by Oceanic Ridges
Long waves are affected by bottom topography and under certain conditions may be trapped along topographical contours which then act as wave guides transmitting wave energy for great distances with little loss. This study examines waves trapped ...
Richard Paul Shaw; Wayne Neu
Ocean Wave Wind Energy Ltd OWWE | Open Energy Information
Wind Energy Ltd OWWE Jump to: navigation, search Name Ocean Wave Wind Energy Ltd OWWE Sector Marine and Hydrokinetic Website http:www.owwe.net Region Norway LinkedIn Connections...
Transient Ocean Currents Induced by Wind and Growing Waves
A theoretical nonlinear model for wind- and wave-induced currents in a viscous, rotating ocean is developed. The analysis is based on a Lagrangian description of motion. The nonlinear drift problem is formulated such that the solution depends on ...
Jan Erik Weber; Arne Melsom
Mapping and Assessment of the United States Ocean Wave Energy...
TECHNICAL REPORT Mapping and Assessment of the United States Ocean Wave Energy Resource EPRI Project Manager P. Jacobson 3420 Hillview Avenue Palo Alto, CA 94304-1338 USA PO Box...
Remote Sensing of Ocean Waves by Polarimetric SAR
A new method to measure ocean wave slope spectra using fully polarimetric synthetic aperture radar (POLSAR) data was developed without the need for a complex hydrodynamic modulation transform function. There is no explicit use of a hydrodynamic ...
Yijun He; Hui Shen; William Perrie
Ocean Power Technologies | Open Energy Information
Power Technologies Power Technologies Jump to: navigation, search Logo: Ocean Power Technologies Name Ocean Power Technologies Address 1590 Reed Road Place Pennington, New Jersey Zip 08534 Year founded 1994 Number of employees 100 Website http://www.oceanpowertechnolog Coordinates 40.297652°, -74.794481° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":40.297652,"lon":-74.794481,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}
The Structure of Near-Inertial Waves during Ocean Storms
Current meter data from two sites were analyzed for near-inertial motions generated by storm during the ten-month period of the Ocean Storms Experiment in the northeast Pacific Ocean. The most striking feature of the inertial wave response to ...
Hongbo Qi; Roland A. De Szoeke; Clayton A. Paulson; Charles C. Eriksen
MHK Technologies/SyncWave Power Resonator | Open Energy Information
Power Resonator Power Resonator < MHK Technologies Jump to: navigation, search << Return to the MHK database homepage SyncWave Power Resonator.jpg Technology Profile Primary Organization Marinus Power Technology Resource Click here Wave Technology Type Click here Point Absorber - Floating Technology Readiness Level Click here TRL 1 3 Discovery Concept Def Early Stage Dev Design Engineering Technology Description The SyncWave Power Resonator makes power by capturing the motion differential due to the phase lag between the two concentric float structures the Float and the Spar each having a very different resonance characteristic in waves The power generated from this phase lag is maximized under varying ocean wave conditions via a proprietary variable inertia tuning system SWELS located inside the central Spar Power is captured by an hydraulic power take off which drives a variable speed generator Power outputs conditioned by modern power electronics from several SyncWave Units in a wave farm will be collected and converted to in farm power in a sea bed mounted collector hub then transmitted ashore by subsea cable for interconnection to a shoreside load
Artificial Retardation of Barotropic Waves in Layered Ocean Models
The effect of reducing the barotropic gravity wave speed in a layered ocean model in order to gain computational speed is explored. In theory the error in the propagation of baroclinic gravity waves typically is less than 3% for a reduction of ...
Tommy G. Jensen
Mapping and Assessment of the United States Ocean Wave Energy Resource
TECHNICAL REPORT TECHNICAL REPORT Mapping and Assessment of the United States Ocean Wave Energy Resource EPRI Project Manager P. Jacobson 3420 Hillview Avenue Palo Alto, CA 94304-1338 USA PO Box 10412 Palo Alto, CA 94303-0813 USA 800.313.3774 650.855.2121 firstname.lastname@example.com 1024637 www.epri.com Final Report, December 2011 Mapping and Assessment of the United States Ocean Wave Energy Resource DISCLAIMER OF WARRANTIES AND LIMITATION OF LIABILITIES THIS DOCUMENT WAS PREPARED BY THE ORGANIZATION(S) NAMED BELOW AS AN ACCOUNT OF WORK SPONSORED OR COSPONSORED BY THE ELECTRIC POWER RESEARCH INSTITUTE, INC. (EPRI).
Global Ocean Surface Wave Simulation Using a Coupled Atmosphere–Wave Model
This study describes a 29-yr (1981–2009) global ocean surface gravity wave simulation generated by a coupled atmosphere–wave model using NOAA/GFDL's High-Resolution Atmosphere Model (HiRAM) and the WAVEWATCH III surface wave model developed and ...
Yalin Fan; Shian-Jiann Lin; Isaac M. Held; Zhitao Yu; Hendrik L. Tolman
Microcomputer Numerical Ocean Surface Wave Model
A numerical wean surface wave model has been developed specifically to operate on desktop super micro-computers. The model uses one or more local and moving grids within which waves of importance at a location of interest are generated. Within ...
Marshall D. Earle
Kinetic Wave Power | Open Energy Information
Kinetic Wave Power Jump to: navigation, search Name Kinetic Wave Power Address 2861 N Tupelo St Place Midland Zip 48642 Sector Marine and Hydrokinetic Phone number 989-839-9757...
Wave Breaking Dissipation in the Wave-Driven Ocean Circulation
If wave breaking modifies the Lagrangian fluid paths by inducing an uncertainty in the orbit itself and this uncertainty on wave motion time scales is observable as additive noise, it is shown that within the context of a wave–current interaction ...
Juan M. Restrepo
Retail beamed power using millimeter waves: Survey
Retail delivery of electric power through millimeter waves is relevant in developing areas where the market for communication devices outpaces the power grid infrastructure. It is also a critical component of an evolutionary path towards terrestrial ... Keywords: Micro renewable energy systems, millimeter wave, power beaming, rural India power, space power grid, systems
Narayanan Komerath; Aravinda Kar
On the Wind Power Input to the Ocean General Circulation
The wind power input to the ocean general circulation is usually calculated from the time-averaged wind products. Here, this wind power input is reexamined using available observations, focusing on the role of the synoptically varying wind. Power ...
Xiaoming Zhai; Helen L. Johnson; David P. Marshall; Carl Wunsch
Directionality and Crest Length Statistics of Steep Waves in Open Ocean Waters
A new wavelet analysis methodology is applied to open ocean wave height data from the Southern Ocean Waves Experiment (1992) and from a field experiment conducted at Duck, North Carolina, in 1997 with the aim of estimating the directionality and ...
Nicholas Scott; Tetsu Hara; Paul A. Hwang; Edward J. Walsh
An Evaluation of Environment Canada's Operational Ocean Wave Model Based on Moored Buoy Data
An operational ocean wave model called the Canadian Spectral Ocean Wave Model (CSOWM) has been implemented in the operational forecasting system of the Atmospheric Environment Service, Environment Canada, since early 1991. The present operational ...
M. L. Khandekar; R. Lalbeharry
Airborne Optical System for Remote Sensing of Ocean Waves
A compact, turret-based optical system has been designed and constructed for passive imaging of ocean waves using a small aircraft. The purpose of the system is to collect time series of images, which are mapped to a common geodetic surface in ...
J. P. Dugan; G. J. Fetzer; J. Bowden; G. J. Farruggia; J. Z. Williams; C. C. Piotrowski; K. Vierra; D. Campion; D. N. Sitter
Reflection of Ocean Surface Gravity Waves from a Natural Beach
The energy of seaward and shoreward propagating ocean surface gravity waves on a natural beach was estimated with data from an army of 24 bottom-mounted pressure sensors in 13-m water depth, 2 km from the North Carolina coast. Consistent with a ...
Steve Elgar; T. H. C. Herbers; R. T. Guza
Wave-coherent airflow and critical layers over ocean waves
An analysis of coherent measurements of winds and waves from data collected during the ONR HiRes program from R/P FLIP off the coast of northern California in June 2010 is presented. A suite of wind and wave measuring systems was deployed to ...
Laurent Grare; Luc Lenain; W. Kendall Melville
A Multisensor Comparison of Ocean Wave Frequency Spectra from a Research Vessel during the Southern Ocean Gas Exchange Experiment
Obtaining accurate measurements of wave statistics from research vessels remains a challenge due to platform motion. One principal correction is the removal of ship heave and Doppler effects from point measurements. Here, open ocean wave ...
Alejandro Cifuentes-Lorenzen; James. B. Edson; Christopher J. Zappa; Ludovic Bariteau
Linear Equatorial Wave Mode Initialization in a Model of the Tropical Pacific Ocean: An Initialization Scheme for Tropical Ocean Models
Data assimilation in models of the tropical oceans can generate spurious equatorial wave modes which are potentially harmful to the model background fields. The amplitudes of these spurious wave modes can often be large and, in general, depend ...
Andrew M. Moore
Nonintrusive Measurement of Ocean Waves: Lidar Wave Gauge
In December 1999, a nonintrusive directional lidar wave gauge (LWG) was field tested at the Field Research Facility (FRF) in North Carolina. The LWG uses proven lidar technology to directly measure water surface elevation from above the water's ...
Jennifer L. Irish; Jennifer M. Wozencraft; A. Grant Cunningham; Claudine Giroud
Mapping and Assessment of the United States Ocean Wave Energy Resource |
450 450 Varnish cache server Mapping and Assessment of the United States Ocean Wave Energy Resource Dataset Summary Description This project estimates the naturally available and technically recoverable U.S. wave energy resources, using a 51-month Wavewatch III hindcast database developed especially for this study by National Oceanographic and Atmospheric Administration's (NOAA's) National Centers for Environmental Prediction. For total resource estimation, wave power density in terms of kilowatts per meter is aggregated across a unit diameter circle. This approach is fully consistent with accepted global practice and includes the resource made available by the lateral transfer of wave energy along wave crests, which enables densities within a few kilometers of a linear array, even for fixed terminator devices.
The wind power input to the ocean general circulation is usually calculated from the time-averaged wind products. Here, this wind power input is reexamined using available observations, focusing on the role of the synoptically ...
Zhai, Xiaoming
Open Ocean Aquaculture & Wave Energy Site | Open Energy Information
Aquaculture & Wave Energy Site Aquaculture & Wave Energy Site Jump to: navigation, search Basic Specifications Facility Name Open Ocean Aquaculture & Wave Energy Site Overseeing Organization University of New Hampshire Hydrodynamics Hydrodynamic Testing Facility Type Offshore Berth Depth(m) 52.0 Cost(per day) Contact POC Special Physical Features The Offshore Mooring System is placed in 52m water depth with a subsurface attachment grid at 20m. The entire mooring system covers 36 acres of bottom. There are four 'bays' into which devices can be attached. Each bay is approximately 130m on a side. There is a database with ~10 years of wave data and other environmental parameters available. Towing Capabilities Towing Capabilities None Wavemaking Capabilities Wavemaking Capabilities Yes
Interplay of Resonant and Quasi-Resonant Interaction of the Directional Ocean Waves
Recent experimental study of the evolution of random directional gravity waves in deep water provides new insight into the nature of the spectral evolution of the ocean waves and the relative significance of resonant and quasi-resonant wave ...
Takuji Waseda; Takeshi Kinoshita; Hitoshi Tamura
Ocean Wave Energy Company OWECO | Open Energy Information
Energy Company OWECO Energy Company OWECO Jump to: navigation, search Name Ocean Wave Energy Company (OWECO) Place Bristol, Rhode Island Sector Ocean Product Wave energy device developer. The company has patented the OWEC Ocean Wave Energy Converter®., a device consisting of a submerged array, suspended at depths permitting full reciprocation of buoys and respective driveshafts. Coordinates 42.55678°, -88.050449° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":42.55678,"lon":-88.050449,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}
Water Power Program: Resource Assessment and Characterization
Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site
of the United States Ocean Wave Energy Resource This report, created by the Electric Power Research Institute, assesses ocean wave energy potential along the U.S. coasts....
A Coupled Atmosphere–Wave–Ocean Modeling System: Simulation of the Intensity of an Idealized Tropical Cyclone
A coupled atmosphere–wave–ocean modeling system (CAWOMS) based on the integration of atmosphere–wave, atmosphere–ocean, and wave–current interaction processes is developed. The component models consist of the Weather Research and Forecasting (WRF)...
Bin Liu; Huiqing Liu; Lian Xie; Changlong Guan; Dongliang Zhao
Long-Wave Dynamics of Sea Level Variations during Indian Ocean Dipole Events
Long-wave dynamics of the interannual variations of the equatorial Indian Ocean circulation are studied using an ocean general circulation model forced by the assimilated surface winds and heat flux of the European Centre for Medium-Range Weather ...
Dongliang Yuan; Hailong Liu
Oceanic Rossby Wave Dynamics and the ENSO Period in a Coupled Model
Tropical ocean wave dynamics associated with the El Nińo–Southern Oscillation cycle in a coupled model are examined. The ocean–atmosphere model consists of statistical atmosphere coupled to a simple reduced gravity model of the tropical Pacific ...
Ben P. Kirtman
Air–Ice–Ocean Momentum Exchange. Part 1:Energy Transfer between Waves and Ice Floes
The energy exchange between ocean surface waves and ice floes in the marginal ice zone (MIZ) involves the scattering and attenuation of wave energy and the excitation of oscillation modes of the ice floes, as open ocean waves propagate into the ...
W. Perrie; Y. Hu
Ocean Surface Wave Measurement Using a Steerable High-Frequency Narrow-Beam Ground Wave Radar
Ground wave radar is emerging as an important tool for routine monitoring of ocean surface conditions and for ship and sea-ice surveillance at ranges well beyond the line-of-sight horizon that limits conventional systems. A major Canadian advance ...
E. W. Gill; M. L. Khandekar; R. K. Howell; J. Walsh
Estimates of Power Consumed by Mixing in the Ocean Interior
Much attention has focused on the power required for driving mixing processes in the ocean interior, the thermohaline circulation, and the related meridional overturning circulation (MOC). Recent estimates range from roughly 0.5 to 2 TW (1 TW = 1 ...
Louis St. Laurent; Harper Simmons
Mass transport in the Stokes edge wave for constant arbitrary bottom slope in a rotating ocean
The Lagrangian mass transport in the Stokes surface edge wave is obtained from the vertically integrated equations of momentum and mass in a viscous rotating ocean, correct to second order in wave steepness. The analysis is valid for bottom slope ...
Peygham Ghaffari; Jan Erik H. Weber
Unstable Waves on Oceanic Fronts: Large Amplitude Behavior and Mean Flow Generation
A primitive equation numerical model is used to study the large amplitude behavior of unstable waves on an oceanic density front, concentrating on a single wave mode corresponding to the fastest growing linear solution. At Small amplitude the ...
Richard A. Wood
The WAM Model—A Third Generation Ocean Wave Prediction Model
A third generation wave model is presented that integrates the basic transport equation describing the evolution of a two-dimensional ocean wave spectrum without additional ad hoe assumptions regarding the spectral shape. The three source ...
The Wamdi Group
Rossby Wave Instability and Apparent Phase Speeds in Large Ocean Basins
The stability of baroclinic Rossby waves in large ocean basins is examined, and the quasigeostrophic (QG) results of LaCasce and Pedlosky are generalized. First, stability equations are derived for perturbations on large-scale waves, using the ...
P. E. Isachsen; J. H. LaCasce; J. Pedlosky
Mooring Design Using Wave-State Estimate from the Southern Ocean
The Southern Ocean Flux Station was deployed near 47°S, 140°E. The extreme wind and wave conditions at this location require appropriate mooring design, which includes dynamic fatigue analysis and static analysis. An accurate estimate of the wave ...
E. W. Schulz; M. A. Grosenbaugh; L. Pender; D. J. M. Greenslade; T. W. Trull
Ocean acoustic wave propagation and ray method correspondence: internal wave fine structure
Acoustic wave fields propagating long ranges through the ocean are refracted by the inhomogeneities in the ocean's sound speed profile. Intuitively, for a given acoustic source frequency, the inhomogeneities become ineffective at refracting the field beyond a certain fine scale determined by the acoustic wavelength. On the other hand, ray methods are sensitive to infinitely fine features. Thus, it is possible to complicate arbitrarily the ray dynamics, and yet have the wave field propagate unchanged. This feature raises doubts about the ray/wave correspondence. Given the importance of various analyses relying on ray methods, a proper model should, at a minimum, exclude all of the fine structure that does not significantly alter the propagated wave field when the correspondence to the ray dynamics is integral. We develop a simple, efficient, smoothing technique to be applied to the inhomogeneities - a low pass filtering performed in the spatial domain - and give a characterization of its necessary extent as a function of acoustic source frequency. We indicate how the smoothing improves the ray/wave correspondence, and show that the so-called ``ray chaos'' problem remains above a very low frequency (about 15-25 Hz).
Katherine C. Hegewisch; Nicholas R. Cerruti; Steven Tomsovic
Ocean Energy Projects Developing On and Off America's Shores | Department
Ocean Energy Projects Developing On and Off America's Shores Ocean Energy Projects Developing On and Off America's Shores Ocean Energy Projects Developing On and Off America's Shores January 22, 2013 - 1:14pm Addthis Artist rendering of Ocean Power Technologies' proposed wave park off the coast of Oregon. | Photo courtesy of Ocean Power Technologies. Artist rendering of Ocean Power Technologies' proposed wave park off the coast of Oregon. | Photo courtesy of Ocean Power Technologies. Verdant testing its tidal energy device in New York's East River. | Photo courtesy of Verdant Power. Verdant testing its tidal energy device in New York's East River. | Photo courtesy of Verdant Power. Ocean Power Technologies wave energy device. | Photo courtesy of Ocean Power Technologies. Ocean Power Technologies wave energy device. | Photo courtesy of Ocean
Calling All Coders: Help Advance America's Ocean Power Industry |
Calling All Coders: Help Advance America's Ocean Power Industry Calling All Coders: Help Advance America's Ocean Power Industry Calling All Coders: Help Advance America's Ocean Power Industry December 10, 2013 - 3:57pm Addthis The Energy Department has launched a new coding competition to help industry develop new models and tools that improve the design, development, and optimization of marine and hydrokinetic devices. | Graphic courtesy of TopCoder The Energy Department has launched a new coding competition to help industry develop new models and tools that improve the design, development, and optimization of marine and hydrokinetic devices. | Graphic courtesy of TopCoder Alison LaBonte Marine and Hydrokinetic Technology Manager Brooke White Oceanographer, Water Power Program
Propagation and Decay of Forced and Free Baroclinic Rossby Waves in Off-Equatorial Oceans
Baroclinic Rossby wave motions in the off-equatorial oceans are investigated with emphasis on how eddy dissipation can influence the propagation of the height anomalies when both the forced wave response to wind in the interior ocean and the free ...
Bo Qiu; Weifeng Miao; Peter Müller
Ocean Wave Energy-Driven Desalination Systems for Off-grid Coastal Communities in Developing Countries
Resolute Marine Energy, Inc. (RME) is based in Boston, MA and is developing ocean wave energy converters (WECs) to benefit remote off-grid communities in developing nations. Our two WEC technologies are based on the heaving and surging motion of a buoy ... Keywords: ocean wave energy, renewable energy, desalination, water, coastal communities
Eshwan Ramudu
A Spar Buoy for High-Frequency Wave Measurements and Detection of Wave Breaking in the Open Ocean
Waves and wave breaking play a significant role in the air–sea exchanges of momentum, sea spray aerosols, and trace gases such as CO2, but few direct measurements of wave breaking have been obtained in the open ocean (far from the coast). This ...
Robin W. Pascal; Margaret J. Yelland; Meric A. Srokosz; Bengamin I. Moat; Edward M. Waugh; Daniel H. Comben; Alex G. Cansdale; Mark C. Hartman; David G. H. Coles; Ping Chang Hsueh; Timothy G. Leighton
Variations in the Flow of the Global Atmosphere Associated with a Composite Convectively Coupled Oceanic Kelvin Wave
Kelvin waves in the Pacific Ocean occasionally develop and propagate eastward together with anomalies of deep convection and low-level westerly wind. This pattern suggests coupling between the oceanic waves and atmospheric convection. A simple ...
Paul E. Roundy; Lynn M. Gribble-Verhagen
Directional Wind–Wave Coupling in Fully Coupled Atmosphere–Wave–Ocean Models: Results from CBLAST-Hurricane
The extreme high winds, intense rainfall, large ocean waves, and copious sea spray in hurricanes push the surface-exchange parameters for temperature, water vapor, and momentum into untested regimes. The Coupled Boundary Layer Air–Sea Transfer (...
Shuyi S. Chen; Wei Zhao; Mark A. Donelan; Hendrik L. Tolman
Directional Wind-Wave Coupling in Fully Coupled Atmosphere-Wave-Ocean Models: Results from CBLAST-Hurricane
The extreme high winds, intense rainfall, large ocean waves, and copious sea spray in hurricanes push the surface-exchange parameters for temperature, water vapor, and momentum into untested regimes. The Coupled Boundary Layer Air-Sea Transfer (...
Estimated global ocean wind power potential from QuikSCAT observations, accounting for turbine characteristics and siting
C. S. Zender (2009), Global ocean wind power sensitivity toG. C. Johnson (2001), Ocean currents evident in satellitepower distribution over the ocean, Geophys. Res. Lett. , 35,
The dynamics of internal gravity waves in the ocean: theory and applications
In this paper we consider fundamental processes of the disturbance and propagation of internal gravity waves in the ocean modeled as a vertically stratified, horizontally non-uniform, and non-stationary medium. We develop asymptotic methods for describing the wave dynamics by generalizing the spatiotemporal ray-tracing method (a geometrical optics method). We present analytical and numerical algorithms for calculating the internal gravity wave fields using actual ocean parameters such as physical characteristics of the sea water, topography of its floor, etc. We demonstrate that our mathematical models can realistically describe the internal gravity wave dynamics in the ocean. Our numerical and analytical results show that the internal gravity waves have a significant impact on underwater objects in the ocean.
Bulatov, Vitaly V
Vitaly V. Bulatov; Yuriy V. Vladimirov
On the internal gravity waves in the stratified ocean with shear flows
In this paper, we consider a fundamental problem of describing the dynamics of internal gravity waves in the stratified ocean with shear flows. We develop an asymptotic representation of the wave fields in terms of the Green's functions. We explore the far field of the internal gravity waves generated by disturbing sources, and propose asymptotic algorithms for calculating its dynamics.
Interaction of Ocean Waves with a Soft Bottom
Soft muddy bottoms have significant effects on properties of water waves which propagate over them. The wave dispersion equation is modified and wave energy is dissipated by the coupling between the waves in water and those induced in the mud ...
S. V. Hsiao; O. H. Shemdin
MHK Technologies/Turbo Ocean Power Generator MadaTech 17 | Open...
Ocean Power Generator MadaTech 17 < MHK Technologies Jump to: navigation, search << Return to the MHK database homepage Turbo Ocean Power Generator MadaTech 17.jpg Technology...
Propagation of Low-Mode Internal Waves through the Ocean
The baroclinic tides play a significant role in the energy budget of the abyssal ocean. Although the basic principles of generation and propagation are known, a clear understanding of these phenomena in the complex ocean environment is only now ...
Luc Rainville; Robert Pinkel
Effect of Breaking Waves on the Transport of Heat and Vapor Fluxes from the Ocean
One method of studying the complexities of the atmospheric surface layer over the ocean during high sea states is to consider the waves as moving drag objects for the wind. The study treats transport equations for the momentum, temperature, ...
S. C. Ling
A Study of the Wavenumber Spectra of Short Water Waves in the Ocean
Spatial measurements of capillary-gravity waves in the ocean were obtained using a scanning slope sensor mounted on a free-drifting buoy intended to minimize the flow disturbance. The data provide direct calculation of the wavenumber spectra of ...
Paul A. Hwang; Serhad Atakturk; A. Sletten; Dennis B. Trizna
Development and Implementation of Wind-Generated Ocean Surface Wave Modelsat NCEP
A brief historical overview of numerical wind wave forecast modeling efforts at the National Centers for Environmental Prediction (NCEP) is presented, followed by an in-depth discussion of the new operational National Oceanic and Atmospheric ...
Hendrik L. Tolman; Bhavani Balasubramaniyan; Lawrence D. Burroughs; Dmitry V. Chalikov; Yung Y. Chao; Hsuan S. Chen; Vera M. Gerald
Use of the 3D Radon Transform to Examine the Properties of Oceanic Rossby Waves
One of the most successful applications of satellite-borne radar altimeter data over the oceans in recent years has been the extraction of information about long-wavelength baroclinic Rossby (or planetary) waves, which play a significant role in ...
Peter G. Challenor; Paolo Cipollini; David Cromwell
Intercomparison of the Performance of Operational Ocean Wave Forecasting Systems with Buoy Data
The monthly exchange of ocean wave model data has successfully been taking place among five operational weather centers. The data are compared with observations obtained from moored buoys and platforms. The analysis of 3 yr of data has helped to ...
Jean-Raymond Bidlot; Damian J. Holmes; Paul A. Wittmann; Roop Lalbeharry; Hsuan S. Chen
Current-Induced Modulation of the Ocean Wave Spectrum and the Role of Nonlinear Energy Transfer
Numerical simulations were performed to investigate current-induced modulation of the spectral and statistical properties of ocean waves advected by idealized and realistic current fields. In particular, the role of nonlinear energy transfer ...
Hitoshi Tamura; Takuji Waseda; Yasumasa Miyazawa; Kosei Komatsu
Transient Evolution of Langmuir Turbulence in Ocean Boundary Layers Driven by Hurricane Winds and Waves
A large-eddy simulation (LES) model, which adopts wave-averaged equations with vortex force, is used to investigate Langmuir turbulence and ocean boundary layer (OBL) dynamics in high-wind hurricane conditions. The temporally evolving spatially ...
Peter P. Sullivan; Leonel Romero; James C. McWilliams; W. Kendall Melville
A Planetary Wave Analysis Using the Acoustic and Conventional Arrays in the 1981 Ocean Tomography Experiment
Using the maximum likelihood estimation method, quasi-geostrophic wave solutions are fitted to the observations of the 1981 Ocean Acoustic Tomography Experiment. The experiment occupied a 300 km square area centered at 26°N, 70°W over a duration ...
Ching-Sang Chiu; Yves Desaubies
Airborne Measurements of the Wavenumber Spectra of Ocean Surface Waves. Part II: Directional Distribution
An airborne scanning lidar system acquires three-dimensional (3D) spatial topography of ocean surface waves. From the spatial data, wavenumber spectra are computed directly. The spectral properties in terms of the spectral slope and dimensionless ...
Paul A. Hwang; David W. Wang; Edward J. Walsh; William B. Krabill; Robert N. Swift
High-Height Long-Period Ocean Waves Generated by a Severe Storm in the Northeast Pacific Ocean during February 1983
Unusally severe storms occurred in the northeast Pacific Ocean between January and March 1983, and waves from these storms caused extensive erosion and damage along the U.S. west coast. Wave conditions as measured by eight data buoys are ...
Marshall D. Earle; Kathryn A. Bush; Glenn D. Hamilton
Ocean Energy Technology Basics | Department of Energy
Ocean Energy Technology Basics Ocean Energy Technology Basics Ocean Energy Technology Basics August 16, 2013 - 4:18pm Addthis Text Version Photo of low waves in the ocean. A dock is visible in the background. Oceans cover more than 70% of the Earth's surface. As the world's largest solar collectors, oceans contain thermal energy from the sun and produce mechanical energy from tides and waves. Even though the sun affects all ocean activity, the gravitational pull of the moon primarily drives tides, and wind powers ocean waves. Learn more about: Ocean Thermal Energy Conversion Tidal Energy Wave Energy Ocean Resources Addthis Related Articles Energy Department Releases New Energy 101 Video on Ocean Power A map generated by Georgia Tech's tidal energy resource database shows mean current speed of tidal streams. The East Coast, as shown above, has strong tides that could be tapped to produce energy. | Photo courtesy of Georgia Institute of Technology
Non-spectral methods of analysis of the internal gravity waves measurements in ocean
The paper is devoted to the presentation of the non-spectral methods of analysis of the natural measurements of the internal gravity waves in the ocean with the purpose to determine characteristics of the wave-trains composing the measured field, the forms and parameters of the ocean along the pass of these wave-trains propagation. The problem of the analysis of the data of the natural measurements of the internal waves with the purpose to separate the single wave-trains from the measured field, and on this basis to determine the characteristics of these wave-trains, to receive the information on the sources of excitation of the waves, and the information on the properties of the ocean along the pass of the waves propagation, is directly connected with the problems of the wave dynamics. The basis of the offered algorithms of the analysis is the supposition, that the measured wave field represents the sum of the plane wave-trains having the certain speed and directions of propagation. Transformation of the pac...
Bulatov, Vitaly A
Model-predicted distribution of wind-induced internal wave energy in the world's oceans
Model-predicted distribution of wind-induced internal wave energy in the world's oceans Naoki 9 July 2008; published 30 September 2008. [1] The distribution of wind-induced internal wave energy-scaled kinetic energy are all consistent with the available observations in the regions of significant wind
Miami, University of
Measurements of Ocean Surface Turbulence and Wave–Turbulence Interactions
The uppermost layers of the ocean, along with the lower atmospheric boundary layer, play a crucial role in the air–sea fluxes of momentum, heat, and mass, thereby providing important boundary conditions for both the atmosphere and the ocean that ...
Fabrice Veron; W. Kendall Melville; Luc Lenain
Structure of Intraseasonal Kelvin Waves in the Equatorial Pacific Ocean
Previous studies have shown that intraseasonal Kelvin waves are a prominent mode of variability in the eastern and central equatorial Pacific. These waves appear to be remotely forced by wind variations in the western Pacific and propagate ...
Eric S. Johnson; Michael J. Mc Phaden
A Comment on Long Waves in the Pacific Ocean
Surface currents near the equator in the eastern Pacific Ocean fluctuate with periods of 21–30 days. Channel model experiments determined that these changes in oscillations are attributed to variations in the intensity of the South Equatorial ...
Anne D. Seigel
Directional Response of Ocean Waves to Changing Wind Direction
When analysing wave measurements in turning winds, one usually assumes that the rate of change of mean wave direction is determined by the angle between ?w, the wind direction, and ?o, the mean wave direction; however, it is well known that this ...
Gao Quanduo; Gerbrand Komen
Discrete-element model for the interaction between ocean waves and sea ice
We present a discrete element method (DEM) model to simulate the mechanical behavior of sea ice in response to ocean waves. The wave/ice interaction can potentially lead to the fracture and fragmentation of sea ice depending on the wave amplitude and period. The fracture behavior of sea ice is explicitly modeled by a DEM method, where sea ice is modeled by densely packed spherical particles with finite size. These particles are bonded together at their contact points through mechanical bonds that can sustain both tensile & compressive forces and moments. Fracturing can be naturally represented by the sequential breaking of mechanical bonds. For a given amplitude and period of incident ocean wave, the model provides information for the spatial distribution and time evolution of stress and micro-fractures and the fragment size distribution. We demonstrate that the fraction of broken bonds,, increases with increasing wave amplitude. In contrast, the ice fragment size decreases with increasing amplitude.
Xu, Zhijie; Tartakovsky, Alexandre M.; Pan, Wenxiao
The Effect of Wind–Wave–Current Interaction on Air–Sea Momentum Fluxes and Ocean Response in Tropical Cyclones
In this paper, the wind–wave–current interaction mechanisms in tropical cyclones and their effect on the surface wave and ocean responses are investigated through a set of numerical experiments. The key element of the authors' modeling approach ...
Yalin Fan; Isaac Ginis; Tetsu Hara
Airborne Measurements of the Wavenumber Spectra of Ocean Surface Waves. Part I: Spectral Slope and Dimensionless Spectral Coefficient
An airborne scanning lidar system acquires 3D spatial topography of ocean surface waves. From the spatial data, wavenumber spectra are computed directly. The spectral analyses of two distinctively different wave fields are presented. The first ...
Seawater pump study: Ocean Thermal Energy Conversion Program. Final report. [For ocean thermal power plants
DOE Green Energy (OSTI)
The pumping power required to move cold seawater and warm seawater through an Ocean Thermal Energy Conversion (OTEC) power plant is a significant portion of the plant power output; therefore, seawater pump performance, sizing, and cost information are very influential inputs into any power plant system design optimizations. The analysis and evaluation of large seawater pumping systems selected specifically for the OTEC application are provided with a view toward judging the impact of pump selection on overall OTEC power plant performance. A self-contained bulb, direct drive, axial flow pump was found to have a distinct advantage in performance and arrangement flexibility. A design of a pump operating at a net total head rise of 3.5 meters and a flow capacity of 100 m/sup 3//s is presented including pump blade geometry (profiles), pump diffuser geometry, and pump/diffuser configuration and performance. Results are presented in terms of the geometric and power requirements of several related pump designs over a range of seawater capacity from 25 m/sup 3//s to 100 m/sup 3//s. Summary analysis and evaluations include pump design weights and cost estimates.
Little, T.E.
Resource This project estimates the naturally available and technically recoverable U.S. wave energy resources, using a 51-month Wavewatch III hindcast database developed...
MHK Technologies/Wave Power Desalination | Open Energy Information
Desalination < MHK Technologies Jump to: navigation, search << Return to the MHK database homepage Wave Power Desalination.gif Technology Profile Primary Organization Delbuoy...
Correlations between Ambient Noise and the Ocean Surface Wave Field
Measurements of the ambient noise spectrum level N with simultaneous, coincident wind and wave measurements were made from RP FLIP in fall 1991. The measurements were designed to investigate the correlation between the ambient noise and relevant ...
Francis C. Felizardo; W. Kendall Melville
Evolution of the Bimodal Directional Distribution of Ocean Waves
Recent results of numerical wave models have shown that the presence of a bimodal directional spreading is a robust feature at wavenumbers above the spectral peak. This directional bimodality is controlled mainly by directional transfer of energy ...
David W. Wang; Paul A. Hwang
The Annual Rossby Wave in the Central Equatorial Pacific Ocean
We attribute observed annual variations in the subthermocline thermal structure of the central equatorial Pacific to a forced gravest-meridional-mode Rossby wave. In the region between 300 and 800 m (where the Väisälä frequency varies slowly and ...
Roger Lukas; Eric Firing
Dynamic Excitation of Internal Gravity Waves in the Equatorial Oceans
It is proposed that shear instability of the upper flank of the equatorial undercurrent may generate, under a broad range of conditions, downward propagating internal gravity waves (IGW) of large amplitude. The generation mechanism is shown to ...
B. R. Sutherland
Ocean Wave Slope Observations Using Radar Backscatter and Laser Altimeters
Combination of laser and radar aboard an aircraft is used to directly measure long gravity wave surface tilting simultaneously with nadir-viewing microwave backscatter from the sea surface. The presented dataset is extensive, encompassing varied ...
D. Vandemark; B. Chapron; J. Sun; G. H. Crescenti; H. C. Graber
Oceanic Isopycnal Slope Spectra. Part I: Internal Waves
Horizontal tow measurements of internal waves are rare and have been largely supplanted in recent decades by vertical profile measurements. Here, estimates of isotherm displacements and turbulence dissipation rate from a towed vehicle deployed ...
Jody M. Klymak; James N. Moum
Karhunen-Loeve representation of stochastic ocean waves
A new stochastic representation of a seastate is developed based on the Karhunen–Loeve spectral decomposition of stochastic signals and the use of Slepian prolate spheroidal wave functions with a tunable bandwidth parameter. ...
Sclavounos, Paul D.
Modification of the Physics and Numerics in a Third-Generation Ocean Wave Model
The ocean wave model WAM was recently upgraded to improve the coupling between the sea state and the air flow and, in particular, enhance the growth of young wind sea over that of old wind sea. Prior to this change, numerous validations of the ...
Leslie C. Bender
An Open Ocean Trial of Controlled Upwelling Using Wave Pump Technology
In 1976, John D. Isaacs proposed to use wave energy to invert the density structure of the ocean and pump deep, nutrient-rich water into the sunlit surface layers. The basic principle is simple: a length of tubing attached to a surface buoy at ...
Angelicque White; Karin Björkman; Eric Grabowski; Ricardo Letelier; Steve Poulos; Blake Watkins; David Karl
Measurement of Ocean Wave Directional Spectra Using Doppler Side-Scan Sonar Arrays
A technique is presented for extraction of ocean wave directional spectra using Doppler side-scan sonars. Two 103-kHz steerable side-scan beams from a freely drifting subsurface platform are used to estimate horizontal water surface velocity due ...
Mark V. Trevorrow
Trapping of Waves by a Constant Slope internal Interface in a Two-Layer Ocean
It is well known that "edge" and "continental shelf" waves can be trapped by a constant slope nearshore bottom; in a two-layer ocean of great constant depth, a constant slope internal interface, as well as the associated geostrophic current, can ...
Henri Lacombe
On Stable and Unstable Rossby Waves in Non-Zonal Oceanic Shear Flow
We derive linear equations for the study of baroclinic instability of a non-zonal oceanic shear flow whose direction is allowed to change with depth. These equations can be used to study unstable disturbances as well as stable Rossby waves in ...
Yong Q. Kang; James Michael Price; Lorenz Magaard
Spatially Broad Observations of Internal Waves in the Upper Ocean at the Hawaiian Ridge
The density and current structure at the Hawaiian Ridge was observed using SeaSoar and Doppler sonar during a survey extending from Oahu to Brooks Banks. Across- and along-ridge changes in internal wave statistics in the upper ocean within 200 km ...
Joseph P. Martin; Daniel L. Rudnick; Robert Pinkel
Eulerian versus Lagrangian Approaches to the Wave-Induced Transport in the Upper Ocean
It is demonstrated that the Eulerian and the Lagrangian descriptions of fluid motion yield the same form for the mean wave-induced volume fluxes in the surface layer of a viscous rotating ocean. In the Eulerian case, the volume fluxes are ...
Jan Erik H. Weber; Göran Broström; Řyvind Saetra
Statistics of Richardson Number and Instability in Oceanic Internal Waves
The probability density function (pdf) of Richardson number in a Gaussian internal-wave field is derived. It is found to compare well with available data. The pdf depends on only parameter ?, the rms stain in the field, which is very weakly ...
Yves Desaubies; Woollcott K. Smith
The Increasing Wave Height in the North Atlantic Ocean
There are indications that the mean significant wave height at Seven Stones Light Vessel has increased in the period 1960–85. This is of considerable interest for the design of offshore structures and for coastal defense. In this note, the ...
E. Bouws; D. Jannink; G. J. Komen
Hurricane Directional Wave Spectrum Spatial Variation in the Open Ocean
The sea surface directional wave spectrum was measured for the first time in all quadrants of a hurricane's inner core over open water. The NASA airborne scanning radar altimeter (SRA) carried aboard one of the NOAA WP-3D hurricane research ...
C. W. Wright; E. J. Walsh; D. Vandemark; W. B. Krabill; A. W. Garcia; S. H. Houston; M. D. Powell; P. G. Black; F. D. Marks
Comparison of wind stress algorithms, datasets and oceanic power input
If the ocean is in a statistically steady state, energy balance is a strong constraint, suggesting that the energy input into the world ocean is dissipated simultaneously at the same rate. Energy conservation is one of the ...
Yuan, Shaoyu
Experimental Investigation of the Power Generation Performance of Floating-Point Absorber Wave Energy Systems: Preprint
The extraction of energy from ocean waves has gained interest in recent years. The floating-point absorber (FPA) is one of the most promising devices among a wide variety of wave energy conversion technologies. Early theoretical studies mainly focused on understanding the hydrodynamics of the system and on predicting the maximum power that could be extracted by a heaving body. These studies evolve from the investigation of floating-body interactions in offshore engineering and naval architecture disciplines. To our best knowledge, no systematic study has been reported about the investigation of the power generation performance of an FPA with a close-to-commercial design. A series of experimental tests was conducted to investigate the power extraction performance of an FPA system.
Li, Y.; Yu, Y.; Epler, J.; Previsic, M.
MHK Technologies/Ocean Wave Energy Converter OWEC | Open Energy Information
Converter OWEC Converter OWEC < MHK Technologies Jump to: navigation, search << Return to the MHK database homepage Ocean Wave Energy Converter OWEC.jpg Technology Profile Primary Organization Ocean Wave Energy Company Technology Resource Click here Wave Technology Type Click here Point Absorber - Submerged Technology Readiness Level Click here TRL 5 6 System Integration and Technology Laboratory Demonstration Technology Description Neutrally suspended and positively buoyant modules are quick connected into open frame networks Submerged portions are stabilized by variable ballast buoyancy chambers and optional damper sheets situated at a relatively calm depth Frame members carry shaft components of linear rotary converters associated with large point absorber buoys Both directions of reciprocal wave motion i e vertical and horizontal motion directly drive components of counter rotating electrical generators Compared to standard generators wherein one is associated with upstroke and another of smaller proportion with downstroke this configuration increases relative speed with fewer parts Electromechanical loads are real time adjustable with respect to wave sensor web resulting in optimal energy conversion from near fully submerged wave following buoys Electrical conductors are series connected and further quick connected with those of other modules via upper frame members Through implementation of rep
MHK Technologies/Float Wave Electric Power Station | Open Energy
Wave Electric Power Station Wave Electric Power Station < MHK Technologies Jump to: navigation, search << Return to the MHK database homepage Float Wave Electric Power Station.jpg Technology Profile Primary Organization Applied Technologies Company Ltd Technology Resource Click here Wave Technology Type Click here Point Absorber - Floating Technology Readiness Level Click here TRL 5 6 System Integration and Technology Laboratory Demonstration Technology Description The module of FWEPS is an oblong axisymmetrical capsule float which is located on the sea surface Inside the capsule there is a mechanical wave energy converter consisting of an oscillatory system and drive and an electric generator and energy accumulator Under the wave effect the capsule float and inner oscillatory system of the mechanical converter are in continuous oscillatory motion while the drive engaged with the system provides a continuous turn for the electric generator
MHK Projects/Greenwave Rhode Island Ocean Wave Energy Project | Open Energy
Greenwave Rhode Island Ocean Wave Energy Project Greenwave Rhode Island Ocean Wave Energy Project < MHK Projects Jump to: navigation, search << Return to the MHK database homepage Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":5,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"500px","height":"350px","centre":false,"title":"","label":"","icon":"File:Aquamarine-marker.png","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":41.4501,"lon":-71.4495,"alt":0,"address":"","icon":"http:\/\/prod-http-80-800498448.us-east-1.elb.amazonaws.com\/w\/images\/7\/74\/Aquamarine-marker.png","group":"","inlineLabel":"","visitedicon":""}]}
How Purely Wind-Driven Long Planetary Geostrophic Waves May Be Energized in the Western Part of Ocean Subtropical Gyres
Satellite observations and idealized numerical studies reveal intensification of long-period (on the order of one cycle per year) waves in the western part of ocean basins. The authors explore the idea that the intensification is associated with ...
Ivana Cerove?ki; Roland de Szoeke
Fitting Dynamic Models to the Geosat Sea Level Observations in the Tropical Pacific Ocean. Part I: A Free Wave Model
Free, equatorially trapped sinusoidal wave solutions to a linear model on an equatorial beta plane are used to fit the Geosat altimetric sea level observations in the Tropical Pacific Ocean. The Kalman filter technique is used to estimate the ...
Lee-Lueng Fu; Jorge Vazquez; Claire Perigaud
Evaluation of Various Approximations in Atmosphere and Ocean Modeling based on an Exact Treatment of Gravity Wave Dispersion
Various approximations of the governing equations of compressible fluid dynamics are commonly used in both atmospheric and ocean modeling. Their main purpose is to eliminate the acoustic waves that are potentially responsible for inefficiency in ...
John K. Dukowicz
Modulation of South Indian Ocean Tropical Cyclones by the Madden–Julian Oscillation and Convectively Coupled Equatorial Waves
The subseasonal modulation of tropical cyclone (TC) genesis by large-scale atmospheric wave modes is studied using data from the south Indian Ocean region. The modes considered are the Madden–Julian oscillation (MJO), and the convectively coupled ...
Miloud Bessafi; Matthew C. Wheeler
Energy Flux from Traveling Hurricanes to the Oceanic Internal Wave Field
The generation of long interval waves by traveling hurricanes on an f plane is studied within the context of linear theory. The emphasis of the present work is on the interval wave power, that is, the fraction of the energy input from the ...
Johan Nilsson
A Numerical Study of Sea-Breeze-Driven Ocean Poincare Wave Propagation and Mixing near the Critical Latitude
Near the vicinity of 30° latitude, the coincidence of the period of sea breeze and the inertial period of the ocean leads to a maximum near-inertial ocean response to sea breeze. This produces a propagating inertial internal (Poincare) wave ...
Xiaoqian Zhang; David C. Smith IV; Steven F. DiMarco; Robert D. Hetland
The Use of Topographic Wave Modes to Solve for the Barotropic Mode of a Rigid-Lid Ocean Model
Topographic wave modes are defined for the barotropic mode of a rigid-lid ocean, and the question is asked whether these might form an efficient basis for a description of the barotropic mode of a general ocean flow. The modes are shown to be ...
C. W. Hughes
MHK Technologies/Gyroscopic wave power generation system | Open Energy
Gyroscopic wave power generation system Gyroscopic wave power generation system < MHK Technologies Jump to: navigation, search << Return to the MHK database homepage Technology Profile Primary Organization Gyrodynamics Corporation Technology Resource Click here Wave Technology Type Click here Attenuator Technology Readiness Level Click here TRL 5 6 System Integration and Technology Laboratory Demonstration Technology Description This gyroscopic wave power generation system is a pure rotational mechanical system that does not use conventional air turbines and is housed on a unique floating platform float In particular its outstanding feature is that it utilizes the gyroscopic spinning effect A motor is used to turn a 1 meter diameter steel disc flywheel inside the apparatus and when the rolling action of waves against the float tilts it at an angle the gyroscopic effect causes the disc to rotate longitudinally This energy turns a generator producing electricity
Protective, Modular Wave Power Generation System
The concept of small wave energy conversion modules that can be built into large, scalable arrays, in the same vein as solar panels, has been developed. This innovation lends itself to an organic business and development model, and enables the use of large-run manufacturing technology to reduce system costs. The first prototype module has been built to full-scale, and tested in a laboratory wave channel. The device has been shown to generate electricity and dissipate wave energy. Improvements need to be made to the electrical generator and a demonstration of an array of modules should be made in natural conditions.
Vvedensky, Jane M.; Park, Robert Y.
On the Patterns of Wind-Power Input to the Ocean Circulation
Pathways of wind-power input into the ocean general circulation are analyzed using Ekman theory. Direct rates of wind work can be calculated through the wind stress acting on the surface geostrophic flow. However, because ...
Roquet, Fabien
Pathways of wind-power input into the ocean general circulation are analyzed using Ekman theory. Direct rates of wind work can be calculated through the wind stress acting on the surface geostrophic flow. However, because that energy is ...
Fabien Roquet; Carl Wunsch; Gurvan Madec
EA-1916: Ocean Renewable Power Company Maine, LLC Cobscook Bay Tidal Energy
1916: Ocean Renewable Power Company Maine, LLC Cobscook Bay 1916: Ocean Renewable Power Company Maine, LLC Cobscook Bay Tidal Energy Pilot Project, Cobscook in Washington County, Maine EA-1916: Ocean Renewable Power Company Maine, LLC Cobscook Bay Tidal Energy Pilot Project, Cobscook in Washington County, Maine Summary This EA evaluates the environmental impacts of a project that would use the tidal currents of Cobscook Bay to generate electricity via cross-flow Kinetic System turbine generator units (TGU) mounted on the seafloor. The TGUs would capture energy from the flow in both ebb and flood directions. Public Comment Opportunities None available at this time. Documents Available for Download March 19, 2012 EA-1916: Finding of No Significant Impact Ocean Renewable Power Company Maine, LLC Cobscook Bay Tidal Energy Pilot
16: Ocean Renewable Power Company Maine, LLC Cobscook Bay 16: Ocean Renewable Power Company Maine, LLC Cobscook Bay Tidal Energy Pilot Project, Cobscook in Washington County, Maine EA-1916: Ocean Renewable Power Company Maine, LLC Cobscook Bay Tidal Energy Pilot Project, Cobscook in Washington County, Maine Summary This EA evaluates the environmental impacts of a project that would use the tidal currents of Cobscook Bay to generate electricity via cross-flow Kinetic System turbine generator units (TGU) mounted on the seafloor. The TGUs would capture energy from the flow in both ebb and flood directions. Public Comment Opportunities None available at this time. Documents Available for Download March 19, 2012 EA-1916: Finding of No Significant Impact Ocean Renewable Power Company Maine, LLC Cobscook Bay Tidal Energy Pilot
This project estimates the naturally available and technically recoverable U.S. wave energy resources, using a 51-month Wavewatch III hindcast database developed especially for this study by National Oceanographic and Atmospheric Administration�¢����s (NOAA�¢����s) National Centers for Environmental Prediction. For total resource estimation, wave power density in terms of kilowatts per meter is aggregated across a unit diameter circle. This approach is fully consistent with accepted global practice and includes the resource made available by the lateral transfer of wave energy along wave crests, which enables wave diffraction to substantially reestablish wave power densities within a few kilometers of a linear array, even for fixed terminator devices. The total available wave energy resource along the U.S. continental shelf edge, based on accumulating unit circle wave power densities, is estimated to be 2,640 TWh/yr, broken down as follows: 590 TWh/yr for the West Coast, 240 TWh/yr for the East Coast, 80 TWh/yr for the Gulf of Mexico, 1570 TWh/yr for Alaska, 130 TWh/yr for Hawaii, and 30 TWh/yr for Puerto Rico. The total recoverable wave energy resource, as constrained by an array capacity packing density of 15 megawatts per kilometer of coastline, with a 100-fold operating range between threshold and maximum operating conditions in terms of input wave power density available to such arrays, yields a total recoverable resource along the U.S. continental shelf edge of 1,170 TWh/yr, broken down as follows: 250 TWh/yr for the West Coast, 160 TWh/yr for the East Coast, 60 TWh/yr for the Gulf of Mexico, 620 TWh/yr for Alaska, 80 TWh/yr for Hawaii, and 20 TWh/yr for Puerto Rico.
Paul T. Jacobson; George Hagerman; George Scott
Barotropic Rossby Waves Radiating from Tropical Instability Waves in the Pacific Ocean
Tropical instability waves are triggered by instabilities of the equatorial current systems, and their sea level signal, with peak amplitude near 5°N, is one of the most prominent features of the dynamic topography of the tropics. Cross-spectral ...
J. Thomas Farrar
Radiation and Dissipation of Internal Waves Generated by Geostrophic Motions Impinging on Small-Scale Topography: Application to the Southern Ocean
Recent estimates from observations and inverse models indicate that turbulent mixing associated with internal wave breaking is enhanced above rough topography in the Southern Ocean. In most regions of the ocean, abyssal mixing has been primarily ...
Maxim Nikurashin; Raffaele Ferrari
Wavenumber–Frequency Spectra of Inertia–Gravity and Mixed Rossby–Gravity Waves in the Equatorial Pacific Ocean
In the 1970s and 1980s, there was considerable interest in near-equatorial variability at periods of days to weeks associated with oceanic equatorial inertia–gravity waves and mixed Rossby–gravity waves. At that time, the measurements available ...
J. Thomas Farrar; Theodore S. Durland
Wind-wave stabilization by a foam layer between the atmosphere and the ocean
The study is motivated by recent findings of the decrease in the momentum transfer from strong winds to sea. The Kelvin-Helmholtz instability (KHI) of a three-fluid system of air, foam and water is examined within the range of intermediately short surface waves. The foam layer thickness necessary for effective separation of the atmosphere and the ocean is estimated. Due to high density contrasts in the three-fluid system, even a relatively thin foam layer between the atmosphere and the ocean can provide a significant stabilization of the water surface by the wavelength shift of the instability towards smaller scales. It is conjectured that such stabilization qualitatively explains the observed reduction of roughness and drag.
Shtemler, Yuri M; Mond, Michael
Integrating wind and wave power in California.
??California is increasing the percentage of its electrical energy supply from renewable energy resources. The motivation to shift from fossil fuel fired electric power plants… (more)
Stoutenburg, Eric Dale
High Power Superconducting Continuous Wave Linacs for Protons and
Office of Science (SC) Website
Power Superconducting Continuous Power Superconducting Continuous Wave Linacs for Protons and Heavy-Ions Nuclear Physics (NP) NP Home About Research Facilities Science Highlights Benefits of NP Spinoff Applications Spinoff Archives SBIR/STTR Applications of Nuclear Science and Technology Funding Opportunities Nuclear Science Advisory Committee (NSAC) News & Resources Contact Information Nuclear Physics U.S. Department of Energy SC-26/Germantown Building 1000 Independence Ave., SW Washington, DC 20585 P: (301) 903-3613 F: (301) 903-3833 E: firstname.lastname@example.com More Information » Spinoff Archives High Power Superconducting Continuous Wave Linacs for Protons and Heavy-Ions Print Text Size: A A A RSS Feeds FeedbackShare Page Application/instrumentation: High Power Superconducting Continuous Wave Linacs for Protons and Heavy-Ions
This project estimates the naturally available and technically recoverable U.S. wave energy resources, using a 51-month Wavewatch III hindcast database developed especially for this study by National Oceanographic and Atmospheric Administration's (NOAA's) National Centers for Environmental Prediction. For total resource estimation, wave power density in terms of kilowatts per meter is aggregated across a unit diameter circle. This approach is fully consistent with accepted global practice and more accura...
Subsurface Hybrid Power Options for Oil & Gas Production at Deep Ocean Sites
An investment in deep-sea (deep-ocean) hybrid power systems may enable certain off-shore oil and gas exploration and production. Advanced deep-ocean drilling and production operations, locally powered, may provide commercial access to oil and gas reserves otherwise inaccessible. Further, subsea generation of electrical power has the potential of featuring a low carbon output resulting in improved environmental conditions. Such technology therefore, enhances the energy security of the United States in a green and environmentally friendly manner. The objective of this study is to evaluate alternatives and recommend equipment to develop into hybrid energy conversion and storage systems for deep ocean operations. Such power systems will be located on the ocean floor and will be used to power offshore oil and gas exploration and production operations. Such power systems will be located on the oceans floor, and will be used to supply oil and gas exploration activities, as well as drilling operations required to harvest petroleum reserves. The following conceptual hybrid systems have been identified as candidates for powering sub-surface oil and gas production operations: (1) PWR = Pressurized-Water Nuclear Reactor + Lead-Acid Battery; (2) FC1 = Line for Surface O{sub 2} + Well Head Gas + Reformer + PEMFC + Lead-Acid & Li-Ion Batteries; (3) FC2 = Stored O2 + Well Head Gas + Reformer + Fuel Cell + Lead-Acid & Li-Ion Batteries; (4) SV1 = Submersible Vehicle + Stored O{sub 2} + Fuel Cell + Lead-Acid & Li-Ion Batteries; (5) SV2 = Submersible Vehicle + Stored O{sub 2} + Engine or Turbine + Lead-Acid & Li-Ion Batteries; (6) SV3 = Submersible Vehicle + Charge at Docking Station + ZEBRA & Li-Ion Batteries; (7) PWR TEG = PWR + Thermoelectric Generator + Lead-Acid Battery; (8) WELL TEG = Thermoelectric Generator + Well Head Waste Heat + Lead-Acid Battery; (9) GRID = Ocean Floor Electrical Grid + Lead-Acid Battery; and (10) DOC = Deep Ocean Current + Lead-Acid Battery.
Farmer, J C; Haut, R; Jahn, G; Goldman, J; Colvin, J; Karpinski, A; Dobley, A; Halfinger, J; Nagley, S; Wolf, K; Shapiro, A; Doucette, P; Hansen, P; Oke, A; Compton, D; Cobb, M; Kopps, R; Chitwood, J; Spence, W; Remacle, P; Noel, C; Vicic, J; Dee, R
A Nonlinear Model of the Shoaling and Refraction of Interfacial Solitary Waves in the Ocean. Part I: Development of the Model and Investigations of the Shoaling Effect
Oceanic internal waves are frequently observed to be of large amplitude, and to exhibit significant wave front curvature, as seen in synthetic aperture radar images. The aim of this paper is to present a refraction model in two horizontal ...
Justin Small
Power supply switching for a mm-wave asymmetric multilevel outphasing power amplifier system
This thesis demonstrates power switches to be used in our new Asymmetric Multilevel Outphasing (AMO) transmitter architecture at mm-wave frequencies. The AMO topology breaks the linearity vs. efficiency design objective ...
Spaulding, Jonathon David
Advanced, High Power, Next Scale, Wave Energy Conversion Device
The project conducted under DOE contract DE?EE0002649 is defined as the Advanced, High Power, Next Scale, Wave Energy Converter. The overall project is split into a seven?stage, gated development program. The work conducted under the DOE contract is OPT Stage Gate III work and a portion of Stage Gate IV work of the seven stage product development process. The project effort includes Full Concept Design & Prototype Assembly Testing building on our existing PowerBuoy? technology to deliver a device with much increased power delivery. Scaling?up from 150kW to 500kW power generating capacity required changes in the PowerBuoy design that addressed cost reduction and mass manufacturing by implementing a Design for Manufacturing (DFM) approach. The design changes also focused on reducing PowerBuoy Installation, Operation and Maintenance (IO&M) costs which are essential to reducing the overall cost of energy. In this design, changes to the core PowerBuoy technology were implemented to increase capability and reduce both CAPEX and OPEX costs. OPT conceptually envisaged moving from a floating structure to a seabed structure. The design change from a floating structure to seabed structure would provide the implementation of stroke? unlimited Power Take?Off (PTO) which has a potential to provide significant power delivery improvement and transform the wave energy industry if proven feasible.
Mekhiche, Mike [Principal Investigator] [Principal Investigator; Dufera, Hiz [Project Manager] [Project Manager; Montagna, Deb [Business Point of Contact] [Business Point of Contact
Ocean thermal energy conversion power system development-I. Phase I. Final report
The objective of the Ocean Thermal Energy Conversion (OTEC) Power System Development-I (PSD-I), Phase I, study was to develop conceptual and preliminary designs of closed-cycle ammonia power system modules for the 100-MW(e) OTEC Demonstration Plant, the 400-MW(e) Commercial Size Plant, and Heat Exchanger Test Articles representative of the full-size power system module design. Results are presented.
Not Available
Rotordynamics in alternative energy power generation.
??This thesis analyses and discusses the main alternative energy systems that work with rotordynamics machines to generate power. Hydropower systems, wave and ocean energy, geothermal,… (more)
Cortes-Zambrano, Ivan
2005), Evaluation of global wind power, J. Geophys. Res. ,Pryor (2003), Can satellite sampling of offshore wind speedsrealistically represent wind speed distributions? , J. Appl.
Status of Wave and Tidal Power Technologies for the United States
This paper presents the status of marine applications for renewable energy as of 2008 from a U.S. perspective. Technologies examined include wave, tidal, and ocean current energy extraction devices.
Musial, W.
Generation of Annual-Period Rossby Waves in the South Atlantic Ocean by the Wind Stress Curl
The properties of first-mode annual-period baroclinic Rossby waves generated by the observed wind stress curl in a numerical model of the South Atlantic and Southwest Indian oceans are presented. The forcing wind field for the area 15°–51°S, 45°W–...
Christopher J. C. Reason; Lawrence A. Mysak; Patrick F. Cummins
On the Effect of Ocean Waves on the Kinetic Energy Balance and Consequences for the Inertial Dissipation Technique
For large wind speed (in practice >15 m s?1) observations of the surface stress by means of the inertial dissipation technique are so close to the surface that effects of growing ocean waves on the turbulent kinetic energy budget should be taken ...
Peter A. E. M. Janssen
On the Variability of Wind Power Input to the Oceans with a Focus on the Subpolar North Atlantic
Variations in power input to the ocean using a recent global "reanalysis" extending back to 1871 show a strong trend in the net power input since then, a trend dominated by the Southern Ocean region. This trend is interpreted as a spurious result ...
Xiaoming Zhai; Carl Wunsch
The Estimated Global Ocean Wind Power Potential from QuikSCAT Observations, Accounting for Turbine
The Estimated Global Ocean Wind Power Potential from QuikSCAT Observations, Accounting for Turbine offshore turbine characteristics including hub height, usable portion of the wind speed distri- bution hemisphere extratropics, respectively, between hub heights of 10 m and 100 m. A turbine with a cut-out speed
Zender, Charles
Optimal Power-Law Description of Oceanic Whitecap Coverage Dependence on Wind Speed
The optimal power-law expression for the dependence of oceanic whitecap coverage fraction W on 10 m elevation wind speed U as determined by ordinary least squares fitting applied to the combined whitecap data sets of Monahan (1971) and Toba and ...
Edward C. Monahan; IognáidÓ Muircheartaigh
A low-power wave union TDC implemented in FPGA
A low-power time-to-digital convertor (TDC) for an application inside a vacuum has been implemented based on the Wave Union TDC scheme in a low-cost field programmable gate array (FPGA) device. Bench top tests have shown that a time measurement resolution better than 30 ps (standard deviation of time differences between two channels) is achieved. Special firmware design practices are taken to reduce power consumption. The measurements indicate that with 32 channels fitting in the FPGA device, the power consumption on the FPGA core voltage is approximately 9.3 mW/channel and the total power consumption including both core and I/O banks is less than 27 mW/channel.
Wu, Jinyuan; /Fermilab; Shi, Yanchen; Zhu, Douglas; /Illinois Math. Sci. Acad.
Ocean thermal energy conversion (OTEC) power system development. Conceptual design
The conceptual design of a power system for application to the OTEC 100-MWe Demonstration Plant is presented. System modeling, design, and performance are described in detail. Materials considerations, module assembly, and cost considerations are discussed. Appendices include: A) systems analysis, B) general arrangements, C) system equipment, D) ammonia system material considerations; E) ammonia cycle, F) auxiliary subsystems, G) DACS availability analysis, H) heat exchanger supporting data, I) rotating machinery, and J) platform influences. (WHK)
Energy Basics: Ocean Resources
Energy Basics Renewable Energy Printable Version Share this resource Biomass Geothermal Hydrogen Hydropower Ocean Ocean Thermal Energy Conversion Tidal Energy Wave Energy...
Modeling and Analysis of the Wind-Waves Field Variability in the Indian Ocean During 1998-2009 Years
To calculate the wind-waves in the Indian Ocean (IO), the wind field for the period from 1998 to 2009 was used, obtained from the NCEP/NOAA archive, and numerical model WAM (Cycle-4) was applied, modified by the new source function proposed in Polnikov (2005). Based on buoy data for the Indian Ocean, the fitting of the modified model WAM was done, which provides the win in accuracy of calculations on 35%, in comparison with the original model. All the further calculations of the wave fields in IO were made for these model settings. At the first stage, the analysis of the simulation results involves a) mapping the fields of the significant wave height and the wave energy , calculated with different scales of averaging in time T and space R; b) estimating the fields of seasonal, annual and long-term variability; and c) determining the 12-year trend of the annually averaged fields. The analysis was carried out taking into account the previously introduced zoning the ocean area, provided by the spatial inhomogen...
Polnikov, V G; Sannasiraj, S A; Sundar, V
Adjustment of the Ocean under Buoyancy Forces. Part I: The Role of Kelvin Waves
The early stages of the adjustment of an ocean toward equilibrium is examined using an ocean general circulation model. The initial state is one with uniform meridional potential temperature gradients yielding density gradients representative of ...
Roxana C. Wajsowicz; A. E. Gill
Adjustment of the Ocean under Buoyancy Forces. Part II: The Role of Planetary Waves
A numerical ocean general circulation model is used to investigate the early stages in the adjustment to equilibrium of an ocean initially at rest with imposed uniform meridional potential temperature gradients, which yield density gradients ...
Roxana C. Wajsowicz
Effects of internal waves on low frequency, long range, acoustic propagation in the deep ocean
This thesis covers a comprehensive analysis of long-range, deep-ocean, low-frequency, sound propagation experimental results obtained from the North Pacific Ocean. The statistics of acoustic fields after propagation through ...
Xu, Jinshan
Wind-Generated Power Input to the Deep Ocean: An Estimate Using a 1/10° General Circulation Model
Recent studies on the wind-generated power input to the geostrophic and nongeostrophic ocean circulation components have used expressions derived from Ekman dynamics. The present work extends and unifies previous studies by deriving an expression ...
Jin-Song von Storch; Hideharu Sasaki; Jochem Marotzke
Wave Energy Conversion Technology
NLE Websites -- All DOE Office Websites (Extended Search)
Wave Energy Conversion Technology Wave Energy Conversion Technology Speaker(s): Mirko Previsic Date: August 2, 2001 - 12:00pm Location: Bldg. 90 Seminar Host/Point of Contact: Julie Osborn Scientists have been working on wave power conversion for the past twenty years, but recent advances in offshore and IT technologies have made it economically competitive. Sea Power & Associates is a Berkeley-based renewable energy technology company. We have developed patented technology to generate electricity from ocean wave energy using a system of concrete buoys and highly efficient hydraulic pumps. Our mission is to provide competitively priced, non-polluting, renewable energy for coastal regions worldwide. Mirko Previsic, founder and CEO, of Sea Power & Associates will discuss ocean wave power, existing technologies for its conversion into
Impact of the Reduced Drag Coefficient on Ocean Wave Modeling under Hurricane Conditions
Effects of new drag coefficient (Cd) parameterizations on WAVEWATCH III (WW3) model surface wave simulations are investigated. The new parameterizations are based on a coupled wind–wave model (CWW) and a wave tank experiment, and yields reduced C...
Il-Ju Moon; Isaac Ginis; Tetsu Hara
An Operational System for Predicting Hurricane-Generated Wind Waves in the North Atlantic Ocean
A new wind–wave prediction model, referred to as the North Atlantic hurricane (NAH) wave model, has been developed at the National Centers for Environmental Prediction (NCEP) to produce forecasts of hurricane-generated waves during the Atlantic ...
Yung Y. Chao; Jose-Henrique G. M. Alves; Hendrik L. Tolman
Parametric Excitation of Internal Gravity Waves in Ocean and Atmosphere as Precursors of Strong Earthquakes and Tsunami
The condition of internal gravity waves (IGW) parametric excitation in the rotating fluid layer heated from above, with the layer vibration along the vertical axis or with periodic modulation in time of the vertical temperature distribution, is obtained. We show the dual role of the molecular dissipative effects that may lead not only to the wave oscillations damping, but also to emergence of hydrodynamic dissipative instability (DI) in some frequency band of IGW. This DI also may take place for the localized in horizontal plane tornado-like disturbances, horizontal scale of which does not exceed the character vertical scale for the fluid layer of the finite depth. Investigated parametric resonance mechanism of IGW generation in ocean and atmosphere during and before earthquakes allows monitoring of such waves (with double period with respect to the period of vibration or temperature gradient modulation) as precursors of these devastating phenomena.
Chefranov, Sergey G
MHK Technologies/OceanStar | Open Energy Information
OceanStar OceanStar < MHK Technologies Jump to: navigation, search << Return to the MHK database homepage OceanStar.jpg Technology Profile Primary Organization Bourne Energy Technology Resource Click here Wave Technology Type Click here Overtopping Technology Readiness Level Click here TRL 4 Proof of Concept Technology Description The OceanStar device captures the underlying pressure wave through a series of small turbine generators The OceanStar relies upon a proprietary energy efficient process to smooth out the pulse characteristics common to wave energy in order to be electrical grid friendly The OceanStars high level of scalability is essential to reach the large surface areas required to reach utility scale ocean power generation Technology Dimensions
Annual Cycle and Depth Penetration of Wind-Generated Near-Inertial Internal Waves at Ocean Station Papa in the Northeast Pacific
The downward propagation of near-inertial internal waves following winter storms is examined in the context of a 2-yr record of velocity in the upper 800 m at Ocean Station Papa. The long time series allow accurate estimation of wave frequency, ...
Matthew H. Alford; Meghan F. Cronin; Jody M. Klymak
Vertical Reynolds Stress Divergence in the Upper Ocean Associated with Linear Wind-Driven, Near-Inertial Waves of Finite Wavelength
Study of a schematic linear, wind-driven, inertio–gravity wave model in the upper ocean finds resonant, near-inertial waves of finite horizontal wavelength to have both horizontal and vertical motions. The mean product of these horizontal motions ...
Warren B. White
The Transparency of Ocean Barriers to Rossby Waves: The Rossby Slit Problem
The transmission of barotropic Rossby wave energy through a meridional barrier pierced only by narrow gaps is studied with a quasigeostrophic model. The incident Rossby wave has the form of either a plane wave or a localized beam of wave energy. ...
Joseph Pedlosky
Large-scale Ocean-based or Geothermal Power Plants by Thermoelectric Effects
Heat resources of small temperature difference are easily accessible, free and unlimited on earth. Thermoelectric effects provide the technology for converting these heat resources directly into electricity. We present designs of electricity generators based on thermoelectric effects and using heat resources of small temperature difference, e.g., ocean water at different depths and geothermal sources, and conclude that large-scale power plants based on thermoelectric effects are feasible and economically competitive. The key observation is that the power factor of thermoelectric materials, unlike the figure of merit, can be improved by orders of magnitude upon laminating good conductors and good thermoelectric materials. The predicted large-scale power plants based on thermoelectric effects, if validated, will have a global economic and social impact for its scalability, and the renewability, free and unlimited supply of heat resources of small temperature difference on earth.
Liu, Liping
Ocean Thermal Energy Conversion power system development. Phase I. Final report
This report covers the conceptual and preliminary design of closed-cycle, ammonia, ocean thermal energy conversion power plants by Westinghouse Electric Corporation. Preliminary designs for evaporator and condenser test articles (0.13 MWe size) and a 10 MWe modular experiment power system are described. Conceptual designs for 50 MWe power systems, and 100 MWe power plants are also descirbed. Design and cost algorithms were developed, and an optimized power system design at the 50 MWe size was completed. This design was modeled very closely in the test articles and in the 10 MWe Modular Application. Major component and auxiliary system design, materials, biofouling, control response, availability, safety and cost aspects are developed with the greatest emphasis on the 10 MWe Modular Application Power System. It is concluded that all power plant subsystems are state-of-practice and require design verification only, rather than continued research. A complete test program, which verifies the mechanical reliability as well as thermal performance, is recommended and described.
Variability in the Upper-Ocean Internal Wave Field at a Sargasso Sea Site
Two 3.5 month time series records of upper-ocean current and density profiles collected in opposite seasons as part of the LOTUS (Long-Term Upper-Ocean Study) project at 34°N, 70°W indicate substantial variation in the shape of horizontal current ...
Charles C. Eriksen
Interdecadal Sea Surface Temperature Variability in the Equatorial Pacific Ocean. Part I: The Role of Off-Equatorial Wind Stresses and Oceanic Rossby Waves
The Australian Bureau of Meteorology Research Centre CGCM and a linear first baroclinic-mode ocean shallow-water model (SWM) are used to investigate ocean dynamic forcing mechanisms of the equatorial Pacific Ocean interdecadal sea surface ...
Shayne McGregor; Neil J. Holbrook; Scott B. Power
The Effect of Breaking Waves on a Coupled Model of Wind and Ocean Surface Waves. Part I: Mature Seas
This is the first of a two-part investigation of a coupled wind and wave model that includes the enhanced form drag of breaking waves. In Part I here the model is developed and applied to mature seas. Part II explores the solutions in a wide ...
Tobias Kukulka; Tetsu Hara
Ocean thermal energy conversion (OTEC) power system development. Preliminary design report, Appendices, Part 1 (Final)
The objective of this project is the development of a preliminary design for a full-sized, closed cycle, ammonia power system module for the 100 MWe OTEC demonstration plant. In turn, this demonstration plant is to demonstrate, by 1984, the operation and performance of an Ocean Thermal Power Plant having sufficiently advanced heat exchanger design to project economic viability for commercial utilization in the late 1980's and beyond. Included in this power system development are the preliminary designs for a proof-of-concept pilot plant and test article heat exchangers which are scaled in such a manner as to support a logically sequential, relatively low-cost development of the full-scale power system module. The conceptual designs are presented for the demonstration plant power module, the proof-of-concept pilot plant, and for a pair of test article heat exchangers. Costs associated with the design, development, fabrication, checkout, delivery, installation, and operation are included. The accompanying design and producibilty studies on the full-scale power system module project the performance/economics for the commercial plant. This section of the report contains appendices on the developed computer models, water system dynamic studies, miscellaneous performance analysis, materials and processes, detailed equipment lists, turbine design studies, tube cleaner design, ammonia leak detection, and heat exchanger design supporting data. (WHK)
Power system development: Ocean Thermal Energy Conversion (OTEC). Preliminary design report: appendices, Part 2 (Final)
The objective of this project is the development of a preliminary design for a full-sized, closed cycle, ammonia power system module for the 100 MWe OTEC demonstration plant. In turn, this demonstration plant is to demonstrate, by 1984, the operation and performance of an Ocean Thermal Power Plant having sufficiently advanced heat exchanger design to project economic viability for commercial utilization in the late 1980's and beyond. Included in this power system development are the preliminary designs for a proof-of-concept pilot plant and test article heat exchangers which are scaled in such a manner as to support a logically sequential, relatively low-cost development of the full-scale power system module. The conceptual designs are presented for the demonstration plant power module, the proof-of-concept pilot plant, and for a pair of test article heat exchangers. Costs associated with the design, development, fabrication, checkout, delivery, installation, and operation are included. The accompanying design and producibilty studies on the full-scale power system module project the performance/economics for the commercial plant. This section of the report contains appendices on the electrical system, instrumentation and control, ammonia pump evaluation study, ammonia and nitrogen support subsystems, piping and support design calculations, and plant availability. (WHK)
Changes of Extreme Wave Heights in Northern Hemisphere Oceans and Related Atmospheric Circulation Regimes
This study assesses trends in seasonal extremes (90- and 99-percentiles) of Significant Wave Height (SWH) in the North Atlantic and the North Pacific, as simulated in a 40-yr global wave hindcast using the National Centers for Environmental ...
Xiaolan L. Wang; Val R. Swail
Semiempirical Dissipation Source Functions for Ocean Waves. Part I: Definition, Calibration, and Validation
New parameterizations for the spectral dissipation of wind-generated waves are proposed. The rates of dissipation have no predetermined spectral shapes and are functions of the wave spectrum and wind speed and direction, in a way consistent with ...
Fabrice Ardhuin; Erick Rogers; Alexander V. Babanin; Jean-François Filipot; Rudy Magne; Aaron Roland; Andre van der Westhuysen; Pierre Queffeulou; Jean-Michel Lefevre; Lotfi Aouf; Fabrice Collard
Observed Variability of Ocean Wave Stokes Drift, and the Eulerian Response to Passing Groups
Waves and currents interact via exchanges of mass and momentum. The mass and momentum fluxes associated with surface waves are closely linked to their Stokes drift. Both the variability of the Stokes drift and the corresponding response of the ...
Jerome A. Smith
Role of Rossby Waves in the Remote Effects of the North Indian Ocean Tropical Disturbances
Remote effects due to the tropical disturbances in the north Indian Ocean are investigated by analyzing long-lasting (?5 days) tropical disturbances, which reached at least the strength of tropical storms. The present analysis is carried out for ...
J. V. Ratnam; S. K. Behera; Y. Masumoto; T. Yamagata
Tropical Ocean Decadal Variability and Resonance of Planetary Wave Basin Modes. Part II: Numerical Study
Oceanic response to stochastic wind forcing is studied in a tropical–extratropical basin using two shallow water models: a periodically forced model and a time-forward model. Consistent with theory, extratropical stochastic wind forces a decadal ...
Haijun Yang; Zhengyu Liu; Qiong Zhang
Pressure-slope momentum transfer in ocean surface boundary layers coupled with gravity waves
The paper focuses on the consequences of including surface and subsurface, wind forced, pressure-slope momentum transfer into the oceanic water column, a transfer process which competes with now-conventional turbulence transfer based on mixing ...
George Mellor
Ocean Thermal Energy Conversion power system development. Phase I: preliminary design. Final report
Westinghouse has completed the Preliminary Design Phase for the Power System Development of the Ocean Thermal Energy Conversion (OTEC) Demonstration Plant project. This study included the development of a preliminary design for a Modular Application scaled power system (10MWe) and Heat Exchanger Test Articles, both based on the concept developed in the Conceptual Design Phase. The results of this study were used to improve the baseline design of the 50MWe module for the Commercial Size Power System, which was recommended for the demonstration plant by the conceptual design study. The 50MWe module was selected since it has the lowest cost, and since its size convincingly demonstrates that future economically viable commercial plants, having reliable operation with credible anticipated costs, are possible. Additional optimization studies on the size of the power system plus hull continue to identify 50MWe as the preferred minimum cost configuration. This study was limited to a closed cycle ammonia power system module, using a seawater temperature difference of 40/sup 0/F, and a surface platform/ship reference hull. This volume describes system operation, a complete test program to verify mechanical reliability and thermal performance, fabrication and installation operations, and a cost analysis. (WHK)
Westinghouse has completed the Preliminary Desigh Phase for the Power System Development of the Ocean Thermal Energy Conversion (OTEC) Demonstration Plant project. This study included the development of a preliminary design for a Modular Application scaled power system (10MWe) and Heat Exchanger Test Articles, both based on the concept developed in the Conceptual Design Phase. The results of this study were used to improve the baseline design of the 50MWe module for the Commercial Size Power System, which was recommended for the demonstration plant by the conceptual design study. The 50MWe module was selected since it has the lowest cost, and since its size convincingly demonstrates that future economically viable commercial plants, having reliable operation with credible anticipated costs, are possible. Additional optimization studies on the size of the power system plus hull continue to identify 50MWe as the preferred minimum cost configuration. This study was limited to a closed cycle ammonia power system module, using a seawater temperature difference of 40/sup 0/F, and a surface platform/ship reference hull. This volume presents the preliminary design configuration and system optimization. (WHK)
Energy Basics: Ocean Energy Technologies
Wirewalker: An Autonomous Wave-Powered Vertical Profiler
An inexpensive vertically profiling float that draws its energy from the ocean surface wavefield is described. Termed the "Wirewalker," it is a generalized platform capable of supporting a variety of self-contained instruments. The motion of the ...
MHK Technologies/IVEC Floating Wave Power Plant | Open Energy Information
IVEC Floating Wave Power Plant IVEC Floating Wave Power Plant < MHK Technologies Jump to: navigation, search << Return to the MHK database homepage IVEC Floating Wave Power Plant.jpg Technology Profile Primary Organization Ivec Pty Ltd Technology Resource Click here Wave Technology Readiness Level Click here TRL 7 8 Open Water System Testing Demonstration and Operation Technology Description FWP design is based on an array of linked OWC s or chambers Similar to the cylinders of a combustion engine each FWP chamber has inlet low pressure flaps valves and outlet high pressure flaps valves As a wave passes through the FWP the water level and thus the air pressure within each chamber oscillates depending on its position within the wave cycle Mooring Configuration single point
The Estimated Global Ocean Wind Power Potential from QuikSCAT Observations, Accounting for Turbine Characteristics and Siting
For the first time, global ocean usable wind power is evaluated for modern offshore turbine characteristics including hub height, usable portion of the wind speed distribution and siting depth. Mean wind power increases by 30%, 69 % and 73 % within the tropics and northern and southern hemisphere extratropics, respectively, between hub heights of 10 m and 100 m. A turbine with a cut-out speed of 25 m s?1 (30 m s?1) within the northern hemisphere storm track harvests between 55 % (82%) and 85% (> 98%) of available power. Within this region, a 2–3m s?1 change in cut-out speed can result in a 5–7 % change in usable power. 80 m wind power accumulates at a rate of 20–45 GW km2 m?2 per meter depth increase from the shore to the shelf break. Beyond the shelf break, wind power accumulates at a slower rate (wind power is assessed for three technology tiers: existing, planned, and future innovations. Usable percent of 80 m available global ocean wind power ranges from 0.40 % for existing to 2.73 % for future envisioned turbine specifications. Offshore wind power production is estimated using typical turbine characteristics including rotor diameter, rated power and siting density. Global offshore wind power is as much as 37 TW (50 % of onshore) and is maximized for the smallest and least powerful of the three turbine specifications evaluated. 1 1
Charles S. Zender
A solar powered distillation plant and pump station for use in ocean side desert areas
There are thousands of miles of ocean shoreline which could sustain a productive human existence if sufficient fresh water were available for human consumption and for irrigation of crops. While solar stills can be built to produce fresh water at or close to sea level, raising water to a height sufficient to irrigate crops, even with minimum water usage crops, requires a significant amount of energy. This paper describes a ``no-external power`` process by which seawater can be purified and raised to a height above sea level sufficient to carry on a productive living in certain areas of the world. This device, the Solar Evaporation and Pumping System (SEAPS) is described as to function and areas of use.
Dearien, J.A.; Priebe, S.J.
The Role of Ekman flow and Planetary Waves in the Oceanic Cross-Equatorial Heat Transport
A numerical model is used to mechanistically simulate the oceans' seasonal cross-equatorial heat transport, and the results of Oort and Vonder Haar (1976). The basic process of Ekman pumping and drift is found to be able to account for a large ...
Paul S. Schopf
Coupling of Biennial Oceanic Rossby Waves with the Overlying Atmosphere in the Pacific Basin
Anomalies of TOPEX/Poseidon sea level height (SLH), NCEP sea surface temperature (SST), and ECMWF meridional surface wind (MSW) and derived wind stress curl (WSC) are mapped biweekly over the global ocean from 60°S to 60°N for two years from 1993 ...
Warren B. White; Yi Chao; Chang-Kou Tai
Observation of Long Equatorial Waves in the Pacific Ocean by Seasat Altimetry
Synoptic maps of the mesoscale dynamic topography in a band between 7.5°N and 7.5°S in the Pacific Ocean are drawn from Seasat altimeter data. They show a set of eddies 600 km in diameter and 15–20 cm in amplitude moving westward with a velocity ...
Jean-Pierre Malardé; Claire Perigaud; Pierre De Mey; Jean-Francois Minster
Electron Trapping in Shear Alfven Waves that Power the Aurora
Results from 1D Vlasov drift-kinetic plasma simulations reveal how and where auroral electrons are accelerated along Earth's geomagnetic field. In the warm plasma sheet, electrons become trapped in shear Alfven waves, preventing immediate wave damping. As waves move to regions with larger v{sub Te}/v{sub A}, their parallel electric field decreases, and the trapped electrons escape their influence. The resulting electron distribution functions compare favorably with in situ observations, demonstrating for the first time a self-consistent link between Alfven waves and electrons that form aurora.
Watt, Clare E. J.; Rankin, Robert [University of Alberta, Edmonton, Alberta (Canada)
Design and cost of near-term OTEC (Ocean Thermal Energy Conversion) plants for the production of desalinated water and electric power. [Ocean Thermal Energy Conversion (OTEC)
There currently is an increasing need for both potable water and power for many islands in the Pacific and Caribbean. The Ocean Thermal Energy Conversion (OTEC) technology fills these needs and is a viable option because of the unlimited supply of ocean thermal energy for the production of both desalinated water and electricity. The OTEC plant design must be flexible to meet the product-mix demands that can be very different from site to site. This paper describes different OTEC plants that can supply various mixes of desalinated water and vapor -- the extremes being either all water and no power or no water and all power. The economics for these plants are also presented. The same flow rates and pipe sizes for both the warm and cold seawater streams are used for different plant designs. The OTEC plant designs are characterized as near-term because no major technical issues need to be resolved or demonstrated. The plant concepts are based on DOE-sponsored experiments dealing with power systems, advanced heat exchanger designs, corrosion and fouling of heat exchange surfaces, and flash evaporation and moisture removal from the vapor using multiple spouts. In addition, the mature multistage flash evaporator technology is incorporated into the plant designs were appropriate. For the supply and discharge warm and cold uncertainties do exist because the required pipe sizes are larger than the maximum currently deployed -- 40-inch high-density polyethylene pipe at Keahole Point in Hawaii. 30 refs., 6 figs., 8 tabs.
Rabas, T.; Panchal, C.; Genens, L.
Near-Millimeter Wave Issues for a Space Power Grid Narayanan Komerath, Vigneshwar Venkat, Jason Fernandez
Near-Millimeter Wave Issues for a Space Power Grid Narayanan Komerath, Vigneshwar Venkat, Jason on Earth. This phase enables renewable power plants to be built at remote locations, and yet exploit these plants to smooth out their power output using input from plants as far away as the other side
Predictive Power Control of Doubly-Fed Induction Generator for Wave Energy Converters
the Doubly- fed induction generator (DFIG). This paper deals then with a model-based predictive power control of a DFIG-based Wave Energy Converter (WEC). In the proposed control approach, the predicted output power was calculated using a DFIG linearized state-space model. The DFIG-based WEC power tracking performances further
Paris-Sud XI, Université de
, accounting for turbine characteristics and siting Scott B. Capps1 and Charles S. Zender1 Received 17 June, global ocean usable wind power is evaluated for modern offshore turbine characteristics including hub, between hub heights of 10 m and 100 m. A turbine with a cutout speed of 25 m s-1 (30 m s-1 ) within
The Antarctic Circumpolar Wave in a Coupled Ocean–Atmosphere GCM
A phenomenon called the Antarctic Circumpolar Wave (ACW), suggested earlier from fragmentary observational evidence, has been simulated realistically in an extended integration of a Max Planck Institute coupled general circulation model. The ACW ...
M. Christoph; T. P. Barnett; E. Roeckner
Observations of the Directional Distribution of Ocean-Wave Energy in Fetch-Limited Conditions
Directional energy distributions of wind-generated waves were observed with a relatively high directional resolution in fairly homogeneous and stationary wind fields in fetch-limited conditions using stereophotography of the sea surface. In a ...
L. H. Holthuijsen
Corrosion and biofouling on the non-heat-exchanger surfaces of an ocean thermal energy conversion power plant: a survey
Of the many foreseeable problems confronting economical ocean thermal energy conversion operation, two major items are the deterioration of the structural and functional components, which prevents efficient operation, and the biofouling of the surfaces, which adds excess weight to the floating ocean platform. The techniques required for effective long-term control of deterioration and corrosion have been investigated actively for many years, and successful solutions for most situations have been developed. For the most part, these solutions can be directly transferred to the ocean thermal energy conversion plant. The majority of problems in these areas are expected to be associated with scale-up and will require some advanced development due to the immensity of the ocean thermal energy conversion platform. Current antifouling control systems are not effective for long-term fouling prevention. Commercially available antifouling coatings are limited to a 3-year service life in temperate waters, and even shorter in tropical waters. However, underwater cleaning techniques and some fouling-control systems presently being used by conventional power plants may find utility on an ocean thermal energy conversion plant. In addition, some recent major advances in long-term antifouling coatings sponsored by the Navy may be applicable to ocean thermal energy conversion. 132 references.
Castelli, V.J. (ed.)
Response of the Kuroshio Extension to Rossby Waves Associated with the 1970s Climate Regime Shift in a High-Resolution Ocean Model
The response of the Kuroshio Extension (KE) to large-scale Rossby waves remotely excited by wind stress changes associated with the 1970s climate regime shift is studied using a high-resolution regional ocean model. Two ensemble simulations are ...
Bunmei Taguchi; Shang-Ping Xie; Humio Mitsudera; Atsushi Kubokawa
Applications of high power millimeter waves in the DIII-D fusion program
First operation of a new generation of MW level, 110 GHz generator (gyrotron) on the DIII-D fusion experimental device has been achieved. The desire for high power, cw millimeter (mm) wave sources to support fusion research and development is just now beginning to be realized. Plasma heating and current drive with directed mm waves rely on the strong absorption achieved when the wave frequency matches the natural ``cyclotron`` frequency of electrons in a magnetic field, or its harmonics. Recent progress in fusion experiments highlights the need for control of the interior details of the hot plasma, and nun wave systems are ideally suited for this role. A brief status of fusion research is given, and the importance of mm waves in the future directions for fusion research is described. The vacuum transmission components necessary for transmitting, monitoring, and launching high power 1 10 GHz waves into a plasma have been developed at General Atomics (GA) and will be described. High power mm waves have a number of attractive technological features for fusion applications compared with other candidate plasma heating and current drive technologies. Millimeter waves can be transmitted with high power density over large distances with low losses by utilizing corrugated waveguides, so the generators can be sited remotely, facilitating maintenance and saving valuable space near the fusion device.
Freeman, R.L.
Distortion of low-frequency acoustic signals by interaction with the moving ocean surface
A moving upper boundary in ocean acoustics . . . . . . 1.21.3 Foundations for studying ocean surface wave in?uence onmodels . . . . . . . . . . . 1.3.2 Ocean surface wave
Lynch, Stephen Dennis
Ocean Energy Technologies
Energy.gov (U.S. Department of Energy (DOE))
Oceans cover more than 70% of the Earth's surface. As the world's largest solar collectors, oceans contain thermal energy from the sun and produce mechanical energy from tides and waves. Even...
Design of Millimeter-Wave Power Ampliers in Silicon /
stub and open stub transmission lines are used as matchingthe use of slow-wave transmission lines, which reduce thethe short and open stub transmission lines. The PA operates
Kalantari, Nader
Extreme wave height estimation for ocean engineering applications in the Gulf of Mexico
Recent hurricanes in the Gulf of Mexico (e.g., Ivan, Dennis, Katrina, Rita and Ike) were observed to develop wave conditions that were near or exceeded the predicted 100-year conditions. As a result, many offshore facilities, as well as coastal infrastructure, which were designed to withstand the 100-year condition, were damaged. New estimates of extreme conditions, which incorporate recently observed maxima, are needed to provide better guidelines for design of coastal and offshore structures. Berek et al. (2007) have used modeled data to develop new criteria, but these estimates can be very sensitive to the data and to the statistical methods used in the development. Berek's estimates also do not cover the entire Gulf of Mexico. We have developed updated estimates of the 100-year extreme wave conditions for the entire Gulf of Mexico using a more comprehensive approach. First, the applicability of standard parametric wind models was examined and appropriate adjustments to the Rankine vortex model were developed to reduce the wind field errors during hurricane conditions. The adjusted winds reduced the error by up to 25 percent compared to the original Rankine vortex model. To obtain reliable wave data, merged wind fields were generated using the NCEP/NCAR Reanalysis 1 project modeled wind data for background wind and the parametric wind model for hurricane conditions. Next, the SWAN wave model was used for the 51-year period from 1958 to 2008 along with multiple statistical methods (Gumbel, Weibull and GEV-Generalized Extreme Value distribution). The effect of the recent hurricane season (2004-2008) shows that maximum 100-year wave height values and their distribution changes. A resampling technique (bootstrap) is used to evaluate and select the optimum statistical method to estimate more appropriate extreme wave conditions.
Jeong, Chan Kwon
Efficiency enhancement techniques for RF and millimeter wave power amplifiers
Power amplifiers are the circuit blocks in wireless transceivers that require the largest power budget because of their relatively low efficiencies. RF designers cannot depend solely on the development better semiconductor ...
Ogunnika, Olumuyiwa Temitope, 1978-
Wave-Turbulence interactions in the Upper Ocean. Part I: The Energy Balance of the Interacting Fields of Surface Wind Waves and Wind-Induced Three-Dimensional Turbulence
We analyze in detail the budget of total and fluctuating energy in the surface layer of the ocean. We suggest a rational scheme for separating the budget of turbulence from that of random wind-generated surface waves, and suggest in particular a ...
S. A. Kitaigorodskii; J. L. Lumley
MHK Technologies/Hybrid wave Wind Wave pumps and turbins | Open Energy
Wind Wave pumps and turbins Wind Wave pumps and turbins < MHK Technologies Jump to: navigation, search << Return to the MHK database homepage Hybrid wave Wind Wave pumps and turbins.jpg Technology Profile Primary Organization Ocean Wave Wind Energy Ltd OWWE Technology Resource Click here Wave Technology Type Click here Point Absorber - Floating Technology Readiness Level Click here TRL 1 3 Discovery Concept Def Early Stage Dev Design Engineering Technology Description 2Wave1Wind The hybrid wave power rig uses two wave converting technologies in addition to wind mills The main system is a pneumatic float in the category of overtopping as Wave Dragon In addition the pneumatic float can house point absorbers The hybrid wave power rig is based on the patented wave energy converter from 2005
MHK Technologies/Ocean Energy Rig | Open Energy Information
Rig Rig < MHK Technologies Jump to: navigation, search << Return to the MHK database homepage Ocean Energy Rig.jpg Technology Profile Primary Organization Free Flow 69 Technology Resource Click here Current Technology Type Click here Axial Flow Turbine Technology Readiness Level Click here TRL 4 Proof of Concept Technology Description The Ocean Energy Rig is a hybrid concept harnessing tidal stream with increased velocity from venturi system wave and wind power The rig also uses solar panels to power computers and warning lights Other unique features include a water ballasting system with automatic self levelling and wave ramps to maximize FreeFlow 69 s new wave power device It is envisaged that the Ocean Energy Rig would be assembled and maintained in dry docks and would be towed out into position before being semi submerged and anchored for operation Power output of the production model would be at least 10MW
Navy Catching Waves in Hawaii | Department of Energy
Navy Catching Waves in Hawaii Navy Catching Waves in Hawaii Navy Catching Waves in Hawaii June 2, 2010 - 11:56am Addthis This experimental power-generating buoy installed off the coast of Oahu can produce enough energy to power 25 homes under optimal conditions. | Photo courtesy of Ocean Power Technologies, Inc. This experimental power-generating buoy installed off the coast of Oahu can produce enough energy to power 25 homes under optimal conditions. | Photo courtesy of Ocean Power Technologies, Inc. To a casual observer, the buoy off the shore of Marine Corps Base Hawaii (MCBH) might look like nothing more than a bright yellow spot in a blue ocean. But this isn't an ordinary buoy - it's a small electrical generator, creating renewable electricity as it bobs up and down on the waves. It's also a test project by the U.S. Navy to see whether a wider
Energy Basics: Wave Energy
Electrojet-independent ionospheric extremely low frequency/very low frequency wave generation by powerful high frequency waves
Results of extremely low frequency/very low frequency (ELF/VLF) wave generation by intensity-modulated high frequency (HF) heaters of 3.2 MHz in Gakona, Alaska, near local solar noon during a geomagnetic quiet time, are presented to support an electrojet-independent ELF/VLF wave generation mechanism. The modulation was set by splitting the HF transmitter array into two subarrays; one was run at cw full power and the other run alternatively at 50% and 100% power modulation by rectangular waves of 2.02, 5, 8, and 13 kHz. The most effective generation was from the X-mode heater with 100% modulation. While the 8 kHz radiation has the largest wave amplitude, the spectral intensity of the radiation increases with the modulation frequency, i.e., 13 kHz line is the strongest. Ionograms recorded significant virtual height spread of the O-mode sounding echoes. The patterns of the spreads and the changes of the second and third hop virtual height traces caused by the O/X-mode heaters are distinctively different, evidencing that it is due to differently polarized density irregularities generated by the filamentation instability of the O/X-mode HF heaters.
Kuo, Spencer [Polytechnic Institute of New York University, 6 MetroTech Center, Brooklyn, New York 11201 (United States); Snyder, Arnold [NorthWest Research Associates, P.O. Box 530, Stockton Springs, Maine 04981 (United States); Chang, Chia-Lie [BAE Systems-Technology Solutions, 2000 North 15th Street, Suite 1100, Arlington, Virginia 22201-2627 (United States)
Wind and Wave Extremes over the World Oceans From Very Large Forecast Ensembles
Global return value estimates of significant wave height and 10-m neutral wind speed are estimated from very large aggregations of archived ECMWF ensemble forecasts at +240-h lead time from the period 2003-2012. The upper percentiles are found to match ENVISAT wind speed better than ERA-Interim (ERA-I), which tends to be biased low. The return estimates are significantly higher for both wind speed and wave height in the extratropics and the subtropics than what is found from ERA-I, but lower than what is reported by Caires and Sterl (2005) and Vinoth and Young (2011). The highest discrepancies between ERA-I and ENS240 are found in the hurricane-prone areas, suggesting that the ensemble comes closer than ERA-I in capturing the intensity of tropical cyclones. The width of the confidence intervals are typically reduced by 70% due to the size of the data sets. Finally, non-parametric estimates of return values were computed from the tail of the distribution. These direct return estimates compare very well with Ge...
Breivik, Řyvind; Abdalla, Saleh; Bidlot, Jean-Raymond
TerraPower Traveling Wave Reactor: Design and Development Status...
Aug 28 2013 09:00 AM - 10:00 AM Pat Schweiger, TerraPower, LLC, Bellevue, Washington Reactor and Nuclear Systems Division Seminar ORNL Conference Center (Bldg. 5200), TN Rm...
High Power Superconducting Continuous Wave Linacs for Protons...
(ANL) Developed in: Current Result of NP research: Spin-off of high power driver linac R&D for the FRIB project Application currently being supported by: DOE Office of Nuclear...
Burbank Water and Power SBX1 2 Compliance Plan
impact hydroelectric generation, digester gas, municipal solid waste, landfill gas, ocean wave, ocean
Ocean Motion International LLC | Open Energy Information
Ocean Motion International LLC Ocean Motion International LLC Jump to: navigation, search Name Ocean Motion International LLC Place Saulsbury, Tennessee Zip 38067 Sector Ocean Product Marine energy technology firm developing ocean/ wave powered generators. Coordinates 35.052242°, -89.083299° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":35.052242,"lon":-89.083299,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}
Solar-Powered Robot Swarm Could Clean Oil : Discovery News http://news.discovery.com/tech/solar-powered-ocean-robots-clean-oil.html?print=true[8/30/2010 8:28:06 AM
Solar-Powered Robot Swarm Could Clean Oil : Discovery News http://news.discovery.com/tech/solar-powered-ocean-robots-clean-oil.html?print=true[8/30/2010 8:28:06 AM] Solar-Powered Robot Swarm Could Clean Oil Oil-absorbing nanomaterial a new solar-powered robot prototype equipped with nanotechnology designed by researchers at MIT
Rock, Chris
Oceans cover almost three-quarters of the Earth's surface, and hold over nine-tenths of the planet's water.
, wave and tidal power). G Sustainable fishery management requires joined-up, interdisciplinary science to predict tides and storm surges accurately G how the oceans' biological productivity depends on tiny plants
Brierley, Andrew
Energy Basics: Ocean Thermal Energy Conversion
Ocean thermal energy conversion power system development-I. Phase I. Preliminary design report. Volume 1. Final report
The results of a conceptual and preliminary design study of Ocean Thermal Energy Conversion (OTEC) closed loop ammonia power system modules performed by Lockheed Missiles and Space Company, Inc. (LMSC) are presented. This design study is the second of 3 tasks in Phase I of the Power System Development-I Project. The Task 2 objectives were to develop: 1) conceptual designs for a 40 to 50-MW(e) closed cycle ammonia commercial plant size power module whose heat exchangers are immersed in seawater and whose ancillary equipments are in a shirt sleeve environment; preliminary designs for a modular application power system sized at 10-MW(e) whose design, construction and material selection is analogous to the 50 MW(e) module, except that titanium tubes are to be used in the heat exchangers; and 3) preliminary designs for heat exchanger test articles (evaporator and condenser) representative of the 50-MW(e) heat exchangers using aluminum alloy, suitable for seawater service, for testing on OTEC-1. The reference ocean platform was specified by DOE as a surface vessel with the heat exchanger immersed in seawater to a design depth of 0 to 20 ft measured from the top of the heat exchanger. For the 50-MW(e) module, the OTEC 400-MW(e) Plant Ship, defined in the Platform Configuration and Integration study, was used as the reference platform. System design, performance, and cost are presented. (WHK)
Wave-actuated power take-off device for electricity generation
Since 2008, Resolute Marine Energy, Inc. (RME) has been engaged in the development of a rigidly moored shallow-water point absorber wave energy converter, the "3D-WEC". RME anticipated that the 3D-WEC configuration with a fully buoyant point absorber buoy coupled to three power take off (PTO) units by a tripod array of tethers would achieve higher power capture than a more conventional 1-D configuration with a single tether and PTO. The investigation conducted under this program and documented herein addressed the following principal research question regarding RME'Â?Â?s power take off (PTO) concept for its 3D-WEC: Is RME's winch-driven generator PTO concept, previously implemented at sub-scale and tested at the Ohmsett wave tank facility, scalable in a cost-effective manner to significant power levels Â?Â?e.g., 10 to 100kW?
Chertok, Allan
Innovative Deepwater Platform Aims to Harness Offshore Wind and Wave Power
Deepwater Platform Aims to Harness Offshore Wind and Deepwater Platform Aims to Harness Offshore Wind and Wave Power Innovative Deepwater Platform Aims to Harness Offshore Wind and Wave Power March 28, 2011 - 5:55pm Addthis An employee installs a smart meter as part of a smart grid initiative by EPB. The project is supporting 390 jobs in the Chattanooga area. | Photo courtesy of EPB An employee installs a smart meter as part of a smart grid initiative by EPB. The project is supporting 390 jobs in the Chattanooga area. | Photo courtesy of EPB Mark Higgins Operations Supervisor, Wind & Water Power Technologies Office Principle Power, Inc, of Seattle is using $1.4 million in funding from the Department of Energy's Office of Energy Efficiency and Renewable Energy to develop an innovative technology with the potential to generate electricity
Wave Energy Basics | Department of Energy
Wave Energy Basics Wave Energy Basics Wave Energy Basics August 16, 2013 - 4:30pm Addthis Photo of a large wave. Wave energy technologies extract energy directly from surface waves or from pressure fluctuations below the surface. Renewable energy analysts believe there is enough energy in ocean waves to provide up to 2 terawatts of electricity. (A terawatt is equal to a trillion watts.) However, wave energy cannot be harnessed everywhere. Wave power-rich areas of the world include the western coasts of Scotland, northern Canada, southern Africa, and Australia as well as the northeastern and northwestern coasts of the United States. In the Pacific Northwest alone, it is feasible that wave energy could produce 40-70 kilowatts (kW) per 3.3 feet (1 meter) of western coastline. Wave Energy Technologies
Grid connection of wave power farm using an N-level cascaded H-bridge multilevel inverter
An N-level cascaded H-bridge multilevel inverter is proposed for grid connection of large wave power farms. The point-absorber wave energy converters are individually rectified and used as isolated DC-sources. The variable power characteristics of the ...
Rickard Ekström, Mats Leijon
Rectification of the Bias in the Wavelet Power Spectrum
This paper addresses a bias problem in the estimate of wavelet power spectra for atmospheric and oceanic datasets. For a time series comprised of sine waves with the same amplitude at different frequencies the conventionally adopted wavelet ...
Yonggang Liu; X. San Liang; Robert H. Weisberg
Investigation of an improved relativistic backward wave oscillator in efficiency and power capacity
Investigation of relativistic backward wave oscillator with high efficiency and power capacity is presented in this paper. To obtain high power and high efficiency, a TM{sub 021} mode resonant reflector is used to reduce the pulse shortening and increase power capacity to about 1.7 times. Meanwhile, an extraction cavity at the end of slow wave structure is employed to improve the efficiency from less than 30% to over 40%, through the beam-wave interaction intensification and better energy conversion from modulated electron beam to the electromagnetic field. Consistent with the numerical results, microwave with a power of 3.2 GW, a frequency of 9.75 GHz, and a pulse width of 27 ns was obtained in the high power microwave generation experiment, where the electron beam energy was configured to be {approx}910 kV and its current to be {approx}8.6 kA. The efficiency of the RBWO exceeds 40% at a voltage range of 870 kV-1000 kV.
Song, W.; Chen, C. H.; Sun, J.; Zhang, X. W.; Shao, H.; Song, Z. M.; Huo, S. F.; Shi, Y. C.; Li, X. Z. [Science and Technology on High Power Microwave Laboratory, Northwest Institute of Nuclear Technology, Xi'an, Shaanxi 710024 (China)
Field Measurements of Duration-Limited Growth of Wind-Generated Ocean Surface Waves at Young Stage of Development
The issue of duration-limited growth of wind-generated waves is of importance to wave studies. Most analytical solutions for wind waves are given in time rather than fetch domain. Numerical modeling of wave development is also often conducted in ...
Paul A. Hwang; David W. Wang
Phase 1: conceptual design. Ocean thermal energy conversion power system development. Volume 2 of 3. Technical details. Final report
Westinghouse has completed the conceptual design of the Power System for the Ocean Thermal Energy Conversion (OTEC) Demonstration Plant project. This study included the development of a conceptual design for the following three items: first, a full-size power system module for the 100 MWe Demonstration Plant; second, a scaled proof of concept power system; and third, a heat exchanger test article. The study was limited to a closed cycle ammonia power system module, using a water temperature difference of 40/sup 0/F., and a surface platform/ship reference hull. Two power module of 50 MWe each are recommended for the demonstration plant. The 50 MWe module was selected since it has the lowest cost, and since it is of a size which convincingly demonstrates that future economically viable commercial plants, having reliable operation with credible anticipated costs, are possible. A modular, tube bundle approach to heat exchanger design makes large heat exchangers practical and economical. Other power module elements are considered to be within state-of-practice. Technological assessments of all subsystems indicate requirements for verification only, rather than continued research. A complete test program, which will verify the mechanical reliability as well as thermal performance, is recommended.
Ocean Energy Program Overview, Fiscal years 1990--1991. Programs in utility technologies
The oceans are the world`s largest solar energy collector and storage system. Covering 71% of the earth`s surface, the oceans collect and store this energy as waves, currents, and thermal and salinity gradients. The purpose of the US Department of Energy`s (DOE) Ocean Energy Program is to develop techniques that harness ocean energy cost effectively and in ways that do not harm the environment. The program seeks to develop ocean energy technology to a point at which industry can accurately assess whether the applications of the technology are viable energy conversion alternatives, or supplements to current power-generating systems. In past studies, DOE identified ocean thermal energy conversion (OTEC), which uses the temperature difference between warm surface water and cold deep water, as the most promising of the ocean energy technologies. As a result, the Ocean Energy Program has concentrated research that advances OTEC technology. The program also monitored developments in wave energy, ocean current, and salinity gradient concepts. It is not actively developing these technologies now. The mission of the Ocean Energy Program is to develop techniques to harness the vast solar energy stored in the oceans` waves, currents, and thermal and salinity gradients.
Energy Technologies Photo of low waves in the ocean. A dock is visible in the background. Oceans cover more than 70% of the Earth's surface. As the world's largest solar...
NREL: Water Power Research Home Page
Aerial photo of ocean waves breaking as they near the shore. Aerial photo of ocean waves breaking as they near the shore. NREL's water power technologies research leverages 35 years of experience developing renewable energy technologies to support the U.S. Department of Energy Water Power Program's efforts to research, test, evaluate, develop and demonstrate deployment of innovative water power technologies. These include marine and hydrokinetic technologies, a suite of renewable technologies that harness the energy from untapped wave, tidal, current and ocean thermal resources, as well as technologies and processes to improve the efficiency, flexibility, and environmental performance of hydropower generation. The vision of the water power team at NREL is to be an essential partner for the technical development and deployment of water power technologies.
Suppression Oceanic Rippies by Surfactant-Spectral Effects Deduced from Sun-Glitter, Wave-Staff and Microwave Measurements
Experimental results on suppression of fine sea-surface structures by surfactant in terms of the roughness length obtained from wind profiles and of the wave-energy density from sun-glitter photographs, wave-staff measurements, and microwave ...
Jin Wu
Ocean Warming Effect on Surface Gravity Wave Climate Change for the End of the Twenty-First Century
Surface wind (U10) and significant wave height (Hs) response to global warming are investigated using a coupled atmosphere–wave model by perturbing the sea surface temperatures (SSTs) with anomalies generated by the Working Group on Coupled ...
Yalin Fan; Isaac M. Held; Shian-Jiann Lin; Xiaolan L. Wang
Ocean Warming effect on Surface Gravity Wave Climate Change for the end of the 21st Century
Surface wind (U10) and significant wave height (Hs) response to global warming are investigated using a coupled atmosphere-wave model by perturbing the sea surface temperatures (SSTs) with anomalies generated by WGCM CMIP-3 coupled models that use ...
MHK Projects/Coos County Offshore Wave Energy Power Plant | Open Energy
Coos County Offshore Wave Energy Power Plant Coos County Offshore Wave Energy Power Plant < MHK Projects Jump to: navigation, search << Return to the MHK database homepage Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":5,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"500px","height":"350px","centre":false,"title":"","label":"","icon":"File:Aquamarine-marker.png","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":43.0238,"lon":-124.519,"alt":0,"address":"","icon":"http:\/\/prod-http-80-800498448.us-east-1.elb.amazonaws.com\/w\/images\/7\/74\/Aquamarine-marker.png","group":"","inlineLabel":"","visitedicon":""}]}
Observations of the Dispersion Characteristics and Meridional Sea Level Structure of Equatorial Waves in the Pacific Ocean
Spectral techniques applied to altimetry data are used to examine the dispersion relation and meridional sea level structure of wavelike variability with periods of about 20 to 200 days in the equatorial Pacific Ocean. Zonal wavenumber–frequency ...
Effect of electron density profile on power absorption of high frequency electromagnetic waves in plasma
Considering different typical electron density profiles, a multi slab approximation model is built up to study the power absorption of broadband (0.75-30 GHz) electromagnetic waves in a partially ionized nonuniform magnetized plasma layer. Based on the model, the power absorption spectra for six cases are numerically calculated and analyzed. It is shown that the absorption strongly depends on the electron density fluctuant profile, the background electron number density, and the collision frequency. A potential optimum profile is also analyzed and studied with some particular parameters.
Xi Yanbin; Liu Yue [MOE Key Laboratory of Materials Modification by Laser, Electron, and Ion Beams, School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian 116024 (China)
A non-intrusive beam power monitor for high power pulsed or continuous wave lasers
DOE Patents (OSTI)
A system for monitoring the output of a laser is provided in which the output of a photodiode disposed in the cavity of the laser is used to provide a correlated indication of the laser power. The photodiode is disposed out of the laser beam to view the extraneous light generated in the laser cavity whose intensity has been found to be a direct correlation of the laser beam output power level. Further, the system provides means for monitoring the phase of the laser output beam relative to a modulated control signal through the photodiode monitor. 4 figs.
Hawsey, R.A.; Scudiere, M.B.
A system and method for monitoring the output of a laser is provided in which the output of a photodiode disposed in the cavity of the laser is used to provide a correlated indication of the laser power. The photodiode is disposed out of the laser beam to view the extraneous light generated in the laser cavity whose intensity has been found to be a direct correlation of the laser beam output power level. Further, the system provides means for monitoring the phase of the laser output beam relative to a modulated control signal through the photodiode monitor.
Excitation of guided ELF-VLF waves through modification of the F{sub 2} ionospheric layer by high-power radio waves
The possibility of controlled excitation of ELF-VLF electromagnetic waves through modification of the F{sub 2} ionospheric layer by high-power high-frequency emission is demonstrated in a natural experiment by using the Sura midlatitude heating facility. The excited low-frequency waves can be used to explore the near-Earth space and stimulate the excitation of a magnetospheric maser.
Markov, G. A.; Belov, A. S.; Komrakov, G. P. [Lobachevsky State University (Russian Federation); Parrot, M. [Environmental Physics and Chemistry Laboratory (France)
Wave Energy
Wave energy technologies extract energy directly from surface waves or from pressure fluctuations below the surface. Renewable energy analysts believe there is enough energy in ocean waves to provide up to 2 terawatts of electricity. (A terawatt is equal to a trillion watts.)
Finavera Renewables Ocean Energy Ltd | Open Energy Information
Renewables Ocean Energy Ltd Renewables Ocean Energy Ltd Jump to: navigation, search Name Finavera Renewables Ocean Energy Ltd Address 595 Burrard Street Suite 3113 Three Bentall Centre PO Box 49071 Place Vancouver Zip V7X 1G4 Sector Marine and Hydrokinetic Phone number 604-288-9051 Website http://www.finavera.com Region Canada LinkedIn Connections CrunchBase Profile No CrunchBase profile. Create one now! This company is listed in the Marine and Hydrokinetic Technology Database. This company is involved in the following MHK Projects: Coos County Offshore Wave Energy Power Plant Figueira da Foz Portugal Humboldt County Wave Project Makah Bay Offshore Wave Pilot Project South Africa Ucluelet BC Canada This company is involved in the following MHK Technologies: AquaBuoy This article is a stub. You can help OpenEI by expanding it.
Ocean thermal energy conversion (OTEC). Power system development. Preliminary design report, final
The preliminary design of the 10 MWe OTEC power module and the 200 kWe test articles is given in detail. System operation and performance; power system cost estimates; 10 MWe heat exchangers; 200 kWe heat exchanger articles; biofouling control;ammonia leak detection, and leak repair; rotating machinery; support subsystem; instrumentation and control; electrical subsystem; installation approach; net energy and resource analysis; and operability, maintainability, and safety are discussed. The conceptual design of the 40 MWe electrical power system includes four or five 10 MWe modules as designed for the 10 MWe pilot plant. (WHK)
NREL: Energy Analysis - Ocean Energy Results - Life Cycle Assessment
Ocean Energy Results - Life Cycle Assessment Review Ocean Energy Results - Life Cycle Assessment Review For more information, visit: Special Report on Renewable Energy Sources and Climate Change Mitigation: Ocean Energy OpenEI: Data, Visualization, and Bibliographies Chart that shows life cycle greenhouse gas emissions for ocean power technologies. For help reading this chart, please contact the webmaster. Estimates of life cycle greenhouse gas emissions of wave and tidal range technologies. Credit: Lewis, A., S. Estefen, J. Huckerby, W. Musial, T. Pontes, J. Torres-Martinez, 2011: Ocean Energy. In IPCC Special Report on Renewable Energy Sources and Climate Change Mitigation [O. Edenhofer, R. Pichs-Madruga, Y. Sokona, K. Seyboth, P. Matschoss, S. Kadner, T. Zwickel, P. Eickemeier, G. Hansen, S. Schlömer, C. von Stechow (eds)], Cambridge University Press. Figure 6.11 Enlarge image
Accounting for Surface Wave Distortion of the Marine Wind Profile in Low-Level Ocean Storms Wind Measurements
Marine wind measurements at three heights (3.0,4.5, and 5.0 m) from both moored and drifting buoys during the Ocean Storms Experiment are described. These winds are compared with each other, with winds from ships, from subsurface ambient acoustic ...
W. G. Large; J. Morzel; G. B. Crawford
Nonequilibrium Response of the Global Ocean to the 5-Day Rossby–Haurwitz Wave in Atmospheric Surface Pressure
The response of the global ocean to the surface pressure signal associated with the well-known 5-day Rossby–Haurwitz atmospheric mode is explored using analytical and numerical tools. Solutions of the Laplace tidal equations for a flat-bottom, ...
Rui M. Ponte
The Concept of a Microwave Radar with an Asymmetric Knifelike Beam for the Remote Sensing of Ocean Waves
The features of near-nadir probing of the ocean surface from a satellite are investigated, and a new configuration of a microwave radar for the surface slopes measurement is proposed. Numerical modeling is used to examine the feasibility of a ...
V. Yu Karaev; M. B. Kanevsky; G. N. Balandina; P. Challenor; C. Gommenginger; M. Srokosz
A Simplified General Circulation Model for a Baroclinic Ocean with Topography. Part I: Theory, Waves, and Wind-Driven Circulations
A new type of ocean general circulation model with simplified physics is described and tested for various simple wind-driven circulation problems. The model consists of the vorticity balance of the depth-averaged flow and a hierarchy of equations ...
Dirk Olbers; Carsten Eden
High power millimeter wave experiment of ITER relevant electron cyclotron heating and current drive system
High power, long pulse millimeter (mm) wave experiments of the RF test stand (RFTS) of Japan Atomic Energy Agency (JAEA) were performed. The system consists of a 1 MW/170 GHz gyrotron, a long and short distance transmission line (TL), and an equatorial launcher (EL) mock-up. The RFTS has an ITER-relevant configuration, i.e., consisted by a 1 MW-170 GHz gyrotron, a mm wave TL, and an EL mock-up. The TL is composed of a matching optics unit, evacuated circular corrugated waveguides, 6-miter bends, an in-line waveguide switch, and an isolation valve. The EL-mock-up is fabricated according to the current design of the ITER launcher. The Gaussian-like beam radiation with the steering capability of 20 deg. - 40 deg. from the EL mock-up was also successfully proved. The high power, long pulse power transmission test was conducted with the metallic load replaced by the EL mock-up, and the transmission of 1 MW/800 s and 0.5 MW/1000 s was successfully demonstrated with no arcing and no damages. The transmission efficiency of the TL was 96%. The results prove the feasibility of the ITER electron cyclotron heating and current drive system.
Takahashi, K.; Kajiwara, K.; Oda, Y.; Kasugai, A.; Kobayashi, N.; Sakamoto, K. [Japan Atomic Energy Agency, 801-1 Mukoyama, Naka, Ibaraki 311-0193 (Japan); Doane, J.; Olstad, R. [General Atomics, P.O. Box 85608, San Diego, California 92186-5608 (United States); Henderson, M. [ITER Organization, CS90 046, 13067 St. Paul lez Durance Cedex (France)
Ocean Thermal Energy Conservation (OTEC) power system development (PDS) II. Preliminary design report
This report documents the results and conclusions of the PDS II, Phase I, preliminary design of a 10 MWe OTEC power system, using enhanced plate type heat exchangers, and of representative 0.2 MWe test articles. It further provides the documentation (specifications, drawings, trade studies, etc.) resulting from the design activities. The data and discussions of the technical concepts are organized to respond to the PDS II, Phase II proposal evaluation criteria. This volume, which specifically addresses the three evaluation categories (heat exchangers, rotating machinery, and power system configuration and performance) is an integral part of the Phase II plans (proposal) which describe the technical approach to delivering test articles to OTEC-1. In addition, there is a section which addresses power system cost and net energy analysis and another which discusses the results of stainless steel feasibility studies. Supporting documentation is contained in two appendix volumes.
Observation of high-power millimeter wave emission from a virtual cathode
Intense bursts of mm wave power have been observed in microwave generation experiments with a relativistic electron beam (REB) virtual cathode oscillator. In this device an electron beam is injected into a drift space at a current above the space-charge-limit, and a potential develops downstream which is large enough to reflect electrons back to the source region. Two mechanisms can give rise to microwave oscillations in a virtual cathode device: electrons reflexing between the real and virtual cathodes, and oscillations in the amplitude and position of the virtual cathode. Typically both mechanisms are present, but in the present experiments reflexing has been shown to be dominant.
Davis, H.A.; Bartsch, R.R.; Sherwood, E.G.; Stringfield, R.M.; Thode, L.E.
Ocean thermal energy conversion gas desorption studies. Volume 1. Design of experiments. [Open-cycle power systems
Seawater deaeration is a process affecting almost all proposed Ocean Thermal Energy Conversion (OTEC) open-cycle power systems. If the noncondensable dissolved air is not removed from a power system, it will accumulate in thecondenser, reduce the effectiveness of condensation, and result in deterioration of system performance. A gas desorption study is being conducted at Oak Ridge National Laboratory (ORNL) with the goal of mitigating these effects; this study is designed to investigate the vacuum deaeration process for low-temperature OTEC conditions where conventional steam stripping deaeration may not be applicable. The first in a series describing the ORNL studies, this report (1) considers the design of experiments and discusses theories of gas desorption, (2) reviews previous relevant studies, (3) describes the design of a gas desorption test loop, and (4) presents the test plan for achieving program objectives. Results of the first series of verification tests and the uncertainties encountered are also discussed. A packed column was employed in these verification tests and test data generally behaved as in previous similar studies. Results expressed as the height of transfer unit (HTU) can be correlated with the liquid flow rate by HTU = 4.93L/sup 0/ /sup 25/. End effects were appreciable for the vacuum deaeration system, and a correlation of them to applied vacuum pressure was derived.
Golshani, A.; Chen, F.C.
Conceptual design of an open-cycle ocean thermal energy conversion net power-producing experiment (OC-OTEC NPPE)
This report describes the conceptual design of an experiment to investigate heat and mass transfer and to assess the viability of open-cycle ocean thermal energy conversion (OC-OTEC). The experiment will be developed in two stages, the Heat- and Mass-Transfer Experimental Apparatus (HMTEA) and the Net Power-Producing Experiment (NPPE). The goal for the HMTEA is to test heat exchangers. The goal for the NPPE is to experimentally verify OC-OTEC's feasibility by installing a turbine and testing the power-generating system. The design effort met the goals of both the HMTEA and the NPPE, and duplication of hardware was minimal. The choices made for the design resource water flow rates are consistent with the availability of cold and warm seawater as a result of the seawater systems upgrade carried out by the US Department of Energy (DOE), the state of Hawaii, and the Pacific International Center for High Technology Research. The choices regarding configuration of the system were made based on projected performance, degree of technical risk, schedule, and cost. The cost for the future phase of the design and the development of the HMTEA/NPPE is consistent with the projected future program funding levels. The HMTEA and NPPE were designed cooperatively by PICHTR, Argonne National Laboratory, and Solar Energy Research Institute under the guidance of DOE. The experiment will be located at the DOE's Seacoast Test Facility at the Natural Energy Laboratory of Hawaii, Kailua-Kona, Hawaii. 71 refs., 41 figs., 34 tabs.
Bharathan, D.; Green, H.J.; Link, H.F.; Parsons, B.K.; Parsons, J.M.; Zangrando, F.
Conceptual design of ocean thermal energy conversion (OTEC) power plants in the Philippines
Extensive temperature readings were obtained to determine suitable OTEC power plant sites in the Philippines. An analysis of temperature profiles reveals that surface seawater is in the range of 25 to 29{degree}C throughout the year while seawater at 500 to 700 m depth remains at a low temperature of 8 to 4{degree}C, respectively. In this article, 14 suitable sites within the Philippine seas are suggested. Conceptual designs for a 5-MW onland-type and a 25-MW floating-type OTEC power plant are proposed. Optimum conditions are determined and plant specifications are computed. Cost estimates show that a floating-type 25-MW OTEC power plant can generate electricity at a busbar power cost of 5.33 to 7.57 cents/kW {times} h while an onshore type 5-MW plant can generate electricity at a busbar cost of 14.71 to 18.09 cents/kW {times} h.
Haruo Uehara; Dilao, C.O.; Tsutomu Nakaoka (Saga Univ. (Japan))
Measurements of the Directional Spectra of Shallow Water Waves Using the Maximum Entropy Principle and a Single Ocean Bottom Seismometer
A new method for measurement of the directional spectra of surface gravity (water) waves is presented here. Measurements are made at a single point by orthogonally mounted seismometers buried 0.5 meters below the seabed surface and a pressure ...
Tom Nye; Tokuo Yamamoto; Mark Trevorrow
Fast-wave Power Flow Along SOL Field Lines In NSTX nd The Associated Power Deposition Profile Across The SOL In Front Of The Antenna
Fast-wave heating and current drive efficiencies can be reduced by a number of processes in the vicinity of the antenna and in the scrape off layer (SOL). On NSTX from around 25% to more than 60% of the high-harmonic fast-wave power can be lost to the SOL regions, and a large part of this lost power flows along SOL magnetic field lines and is deposited in bright spirals on the divertor floor and ceiling. We show that field-line mapping matches the location of heat deposition on the lower divertor, albeit with a portion of the heat outside of the predictions. The field-line mapping can then be used to partially reconstruct the profile of lost fast-wave power at the midplane in front of the antenna, and the losses peak close to the last closed flux surface (LCFS) as well as the antenna. This profile suggests a radial standing-wave pattern formed by fast-wave propagation in the SOL, and this hypothesis will be tested on NSTX-U. Advanced RF codes must reproduce these results so that such codes can be used to understand this edge loss and to minimize RF heat deposition and erosion in the divertor region on ITER.
Perkins, Roy
Assimilation of Altimeter Data into Ocean Models
The problem of assimilating satellite altimeter data into an ocean model is considered for the case in which the ocean currents are weak, so that they can be represented by a superposition of linear Rossby waves, and the altimeter measurements ...
D. J. Webb; A. Moore
Kinetics of density striations excited by powerful electromagnetic waves in the ionosphere
One of the most important effects observed when pumping ionospheric plasma by powerful radio waves from the ground is the excitation of filamentary density striations that are stretched along the ambient geomagnetic field. The kinetics of the striations present in the pump electromagnetic field is studied theoretically. The density irregularities cause inhomogeneities in the pump field, which result in a ponderomotive force acting on the striations that makes the density depressions move perpendicular to the geomagnetic field. Striations moving with different velocities can collide, thereby merging to produce larger scale striations. The merging of striations constitutes a cascade process that distributes the energy over the spatial spectrum of the striations. The resulting inhomogeneity spectrum as well as the obtained outward radial drift of a few meters per second is consistent with experimental results.
Istomin, Ya. N. [P. N. Lebedev Physical Institute, Leninsky Prospect 53, 117924 Moscow (Russian Federation); Leyser, T. B. [Swedish Institute of Space Physics, Box 537, SE-751 21 Uppsala (Sweden)
MHK Technologies/bioWave | Open Energy Information
bioWave bioWave < MHK Technologies Jump to: navigation, search << Return to the MHK database homepage BioWave.jpg Technology Profile Primary Organization BioPower Systems Pty Ltd Project(s) where this technology is utilized *MHK Projects/bioWAVE Pilot Plant Technology Resource Click here Wave Technology Type Click here Oscillating Wave Surge Converter Technology Readiness Level Click here TRL 5/6: System Integration and Technology Laboratory Demonstration Technology Description TThe bioWAVE is based on the swaying motion of sea plants in the presence of ocean waves. The hydrodynamic interaction of the buoyant blades with the oscillating flow field is designed for maximum energy absorption. Mooring Configuration Gravity base Optimum Marine/Riverline Conditions 30 to 50M depth 20kW m wave climate or greater
Ocean energy conversion systems annual research report
Alternative power cycle concepts to the closed-cycle Rankine are evaluated and those that show potential for delivering power in a cost-effective and environmentally acceptable fashion are explored. Concepts are classified according to the ocean energy resource: thermal, waves, currents, and salinity gradient. Research projects have been funded and reported in each of these areas. The lift of seawater entrained in a vertical steam flow can provide potential energy for a conventional hydraulic turbine conversion system. Quantification of the process and assessment of potential costs must be completed to support concept evaluation. Exploratory development is being completed in thermoelectricity and 2-phase nozzles for other thermal concepts. Wave energy concepts are being evaluated by analysis and model testing with present emphasis on pneumatic turbines and wave focussing. Likewise, several conversion approaches to ocean current energy are being evaluated. The use of salinity resources requires further research in membranes or the development of membraneless processes. Using the thermal resource in a Claude cycle process as a power converter is promising, and a program of R and D and subsystem development has been initiated to provide confirmation of the preliminary conclusion.
Ocean Surface Roughness Spectrum in High Wind Condition for Microwave Backscatter and Emission Computations
Ocean surface roughness plays an important role in air-sea interaction and ocean remote sensing. Its primary contribution is from surface waves much shorter than the energetic wave components near the peak of the wave energy spectrum. Field ...
Paul A. Hwang; Derek M. Burrage; David W. Wang; Joel C. Wesson
Ocean surface roughness plays an important role in air–sea interaction and ocean remote sensing. Its primary contribution is from surface waves much shorter than the energetic wave components near the peak of the wave energy spectrum. Field ...
Near and far field models of external fluid mechanics of Ocean Thermal Energy Conversion (OTEC) power plants
The world is facing the challenge of finding new renewable sources of energy - first, in response to fossil fuel reserve depletion, and second, to reduce greenhouse gas emissions. Ocean Thermal Energy Conversion (OTEC) can ...
Rodríguez Buńo, Mariana
Factors Affecting the Accuracy of SHOWEX HF Radar Wave Measurements
Ocean Surface Current Radar (OSCR) HF radar measurements of ocean waves and currents were made during the Shoaling Waves Experiment (SHOWEX) in the fall of 1999. During some periods, at some locations, good quality wave measurements were ...
Lucy R. Wyatt; Guennadi Liakhovetski; Hans C. Graber; Brian K. Haus
Microwave and millimeter-wave rectifying circuit arrays and ultra-wideband antennas for wireless power transmission and communications
In the future, space solar power transmission and wireless power transmission will play an important role in gathering clean and infinite energy from space. The rectenna, i.e., a rectifying circuit combined with an antenna, is one of the most important components in the wireless power transmission system. To obtain high power and high output voltage, the use of a large rectenna array is necessary. Many novel rectennas and rectenna arrays for microwave and millimeter-wave wireless power transmission have been developed. Unlike the traditional rectifying circuit using a single diode, dual diodes are used to double the DC output voltage with the same circuit layout dimensions. The rectenna components are then combined to form rectenna arrays using different interconnections. The rectennas and the arrays are analyzed by using a linear circuit model. Furthermore, to precisely align the mainbeams of the transmitter and the receiver, a retrodirective array is developed to maintain high efficiency. The retrodirective array is able to track the incident wave and resend the signal to where it came from without any prior known information of the source location. The ultra-wideband radio has become one of the most important communication systems because of demand for high data-rate transmission. Hence, ultra-wideband antennas have received much attention in mobile wireless communications. Planar monopole ultra-wideband antennas for UHF, microwave, and millimeter-wave bands are developed, with many advantages such as simple structure, low cost, light weight, and ease of fabrication. Due to the planar structures, the ultra-wideband antennas can be easily integrated with other circuits. On the other hand, with an ultra-wide bandwidth, source power can be transmitted at different frequencies dependent on power availability. Furthermore, the ultra-wideband antenna can potentially handle wireless power transmission and data communications simultaneously. The technologies developed can also be applied to dual-frequency or the multi-frequency antennas. In this dissertation, many new rectenna arrays, retrodirective rectenna arrays, and ultra-wideband antennas are presented for microwave and millimeter-wave applications. The technologies are not only very useful for wireless power transmission and communication systems, but also they could have many applications in future radar, surveillance, and remote sensing systems.
Ren, Yu-Jiun
Ocean Circulation Kinetic Energy: Reservoirs, Sources,
. The coupling of the generation of different energy forms in the dynamics (in either balanced or wave motions are almost nonexistent in the ocean. www.annualreviews.org · Ocean Circulation Kinetic Energy 255 Annu.Rev.Fluid processes? Are the seemingly different dynamical ranges coupled? 2. THE OCEANIC ENERGY BUDGET We begin
Ferrari, Raffaele
cycle ocean thermal difference power plant. M.S. Thesis,ocean thermal energy conversion power plants. M.S. Thesis.comments on the thermal effects of power plants on fish eggs
Sands, M. D.
Wave Power for U.S. Coast Guard First District Lighthouses
Lighthouses and other navigational aids are situated near tumultuous seas and thus may be good candidates for early applications of wave energy conversion technologies. This paper describes gravity wave physics and the characteristics of mechanical radiation (growth, propagation, diffraction, and shoaling).
Walker, A.; Kandt, A.; Heimiller, D.
Ocean thermal energy conversion (OTEC) power system development utilizing advanced, high-performance heat transfer techniques. Volume 1. Conceptual design report
The objective of this project is the development of a preliminary design for a full-sized, closed cycle, ammonia power system module for the 100 MWe OTEC Demonstration Plant. In turn, this Demonstration Plant is to demonstrate, by 1984, the operation and performance of an ocean thermal power plant having sufficiently advanced heat exchanger design to project economic viability for commercial utilization in the late 1980's and beyond. Included in this power system development are the preliminary designs for a proof-of-concept pilot plant and test article heat exchangers which are scaled in such a manner as to support a logically sequential, relatively low-cost development of the full-scale power system module. The conceptual designs are presented for the Demonstration Plant power module, the proof-of-concept pilot plant, and for a pair of test article heat exchangers. Costs associated with the design, development, fabrication, checkout, delivery, installation, and operation are included. The accompanying design and producibility studies on the full-scale power system module project the performance/economics for the commercial plant. This section of the report describes the full-size power system module, and summarizes the design parameters and associated costs for the Demonstration Plant module (prototype) and projects costs for commercial plants in production. The material presented is directed primarily toward the surface platform/ship basic reference hull designated for use during conceptual design; however, other containment vessels were considered during the design effort so that the optimum power system would not be unduly influenced or restricted. (WHK)
and economic cost?benefit analysis of offshore wind energy,energy sources [Jacobson, 2009]. Onshore wind power costs
How Long is the Memory of Tropical Ocean Dynamics?
Combining classic equatorial wave dynamics and midlatitude wave dynamics, a unified view is proposed to account for the memory of tropical ocean dynamics in terms of oceanic basin modes. It is shown that the dynamic memory of the ocean is bounded ...
Z. Liu
Ocean Energy Technology: Overview, Federal Energy Management Program (FEMP)
femp.energy.gov femp.energy.gov Ocean Energy Technology Overview Prepared for the U.S. Department of Energy Office of Energy Efficiency and Renewable Energy Federal Energy Management Program July 2009 DOE/GO-102009-2823 Ocean Energy Technology Overview i Contacts Principal Investigators: Kari Burman Phone: 303-384-7558 E-mail: email@example.com Andy Walker, PhD PE Phone: 303-384-7531 E-mail: firstname.lastname@example.com Energy Management and Federal Markets Group National Renewable Energy Laboratory (NREL) MS 301 1617 Cole Boulevard Golden, CO 80401 Sponsor: U.S. Department of Energy Federal Energy Management Program Acknowledgements This work was sponsored by the U.S. Department of Energy (DOE) Federal Energy Management Program (FEMP). Research regarding ocean energy resources, status of wave and tidal power technologies, and
Minerals Management Service, U.S. Department of the Interior Ocean Energy PAGE 1 Minerals Management Service, U.S. Department of the Interior Ocean Energy PAGE 1 Teacher Guide .......................................................... 2 Related National Science Standards .......................... 3 Introduction to Ocean Energy .................................. 4 Petroleum & Natural Gas ......................................... 5 Natural Oil and Gas Seeps ........................................ 7 Methane Hydrates .................................................... 8 Solar Energy .............................................................. 9 Wind Energy ........................................................... 10 Wave Energy ........................................................... 11 OTEC: Ocean Thermal Energy Conversion .............
Ocean energy systems. Quarterly report, January-March 1983
Progress is reported on the development of Ocean Thermal Energy Conversion (OTEC) systems that will provide synthetic fuels (e.g., methanol), energy-intensive products such as ammonia (for fertilizers and chemicals), and aluminum. The work also includes assessment and design concepts for hybrid plants, such as geothermal-OTEC (GEOTEC) plants. Another effort that began in the spring of 1982 is a technical advisory role to DOE with respect to their management of the conceptual and preliminary design activity of industry teams that are designing a shelf-mounted offshore OTEC pilot plant that could deliver power to Oahu, Hawaii. In addition, a program is underway to evaluate and test the Pneumatic Wave-Energy Conversion System (PWECS), an ocean-energy device consisting of a turbine that is air-driven as a result of wave action in a chamber. This Quarterly Report summarizes the work on the various tasks as of 31 March 1983.
PV water pumping with a peak-power tracker using a simple six-step square-wave inverter
The application of photovoltaics (PVs) has been increasingly popular, especially in remote areas, where power from a utility is not available or is too costly to install. PV-powered water pumping is frequently used for agriculture and in households. Among many available schemes, the system under study consists of a PV array, a variable-frequency inverter, an induction motor, and a water pump. The inverter feeds the induction motor, which drives the water pump. To seek the optimum power output of the PV array, the inverter is operated at variable frequency, to vary the output of the water pump. The inverter is operated to generate a six-step quasi-square wave, instead of a pulsewidth modulated (PWM) voltage output, to reduce the switching losses. The inverter acts as both a variable-frequency source and a peak-power tracker of the system, thus, having the number of switches minimized. The system is a low-cost design, with a simple control strategy. The dc bus is supported by a dc capacitor; thus, a balance-of-power flow must be maintained to avoid the collapse of the dc-bus voltage. Another advantage of the system is that the current is limited to an upper limit of the PV-array current. Thus, in case a short circuit is developed, the motor winding and the power semiconductor switches can be protected against excessive current flow.
Muljadi, E. [National Renewable Energy Lab., Golden, CO (United States)
Arnold Schwarzenegger CALIFORNIA OCEAN WAVE
Intermountain HVDC (Path 27 from Delta, Utah, 2,400 MW) CAWE LO C WINTE RHAV EN MEAD HOOVER MARKETPLACE ELDORADO
A Cross-calibrated, Multiplatform Ocean Surface Wind Velocity Product for Meteorological and Oceanographic Applications
The ocean surface wind mediates exchanges between the ocean and the atmosphere. These air–sea exchange processes are critical for understanding and predicting atmosphere, ocean, and wave phenomena on many time and space scales. A cross-calibrated ...
Robert Atlas; Ross N. Hoffman; Joseph Ardizzone; S. Mark Leidner; Juan Carlos Jusem; Deborah K. Smith; Daniel Gombos
for off- shore wind turbines in Europe and North America,of wind power and wind turbine characteristics, Renewablea multi?megawatt wind turbine, Renewable Energy, Matthews,
Wind Wave Growth at Short Fetch
Wave wire data from the large wind wave tank of the Ocean Engineering Laboratory at the University of California, Santa Barbara, are analyzed, and comparisons are made with published data collected in four other wave tanks. The behavior of wind ...
T. Lamont-Smith; T. Waseda
Nonlinear Wave Statistics in a Focal Zone
In this paper, the combined effects of refraction and nonlinearity on the evolution of ocean surface wave statistics are considered and possible implications for the likelihood of extreme waves, also known as freak or rogue waves, are examined. A ...
T. T. Janssen; T. H. C. Herbers
On the Diurnal Variation of Mountain Waves
The diurnal variation of mountain waves and wave drag associated with flow past mesoscale ridges has been examined using the Coupled Ocean–Atmosphere Mesoscale Prediction System (COAMPS) and an analytical boundary layer (BL) model. The wave drag ...
Qingfang Jiang; James D. Doyle
Instrumentation for the Measurement of Sound Speed near the Ocean Surface
Air bubbles entrained by breaking waves in the ocean surface layer can dramatically alter the velocity and attenuation of acoustic waves. The development of an effective technique for directly measuring the sound speed near the ocean surface is ...
Eric Lamarre; W. K. Melville
MHK Technologies/hyWave | Open Energy Information
hyWave hyWave < MHK Technologies Jump to: navigation, search << Return to the MHK database homepage HyWave.png Technology Profile Primary Organization Wavegen subsidiary of Voith Siemens Hydro Power Generation Project(s) where this technology is utilized *MHK Projects/Mutriku *MHK Projects/Wavegen Technology Resource Click here Wave Technology Readiness Level Click here TRL 1-3: Discovery / Concept Definition / Early Stage Development & Design & Engineering Technology Description The hyWave device rests directly on the seabed and is designed to operate in the near-shore environment in a nominal mean water depth of 15m. Optimum performance will be achieved when driven by a long ocean swell. The pneumatic power of the oscillating water column (OWC) is converted to electricity by a Wells generator and specially designed induction generators.
The decay rate of ocean swell observed by altimeter
Altimeter data from transects across the Southern Ocean is analysed to determine the decay of oceanic swell. The resulting decay rate is shown to be proportional to wave number squared and swell amplitude cubed. Such a decay relationship is ...
I. R. Young; A. V. Babanin; S. Zieger
Interannual Variability in the Eastern Subtropical North Pacific Ocean
Interannual variability in the eastern subtropical North Pacific Ocean is investigated using the Naval Research Laboratory Layered Ocean Model (NLOM). Emphasis is placed on examining the nature of westward propagating Rossby waves and their ...
Alan P. Leonardi; Steven L. Morey; James J. O'Brien
Turbulent Vertical Kinetic Energy in the Ocean Mixed Layer
Vertical velocities in the ocean boundary layer were measured for two weeks at an open ocean, wintertime site using neutrally buoyant floats. Simultaneous measurements of the surface meteorology and surface waves showed a large variability in ...
Eric A. D'Asaro
Ocean Terracing
Artworks can improve humanity ability to apply macro-engineering principles which skirt or correct oceanographic problems impairing the economic usefulness of coastal land, the overhead airshed, and seawater temperature and salinity stability. A new form of Art, Ocean Art, is here proposed which centers on deliberate terracing of appropriate regions of our world ocean; a proposed example of macro-engineered useful Ocean Art is the technically possible 21-st Century terracing of the Mediterranean Sea. Ocean Art is applicable worldwide to places that might be practically improved by its judicious employment. Such Ocean Art may constitute an entirely unique category of solutions to coastal disaster prevention planning.
Richard Cathcart; Alexander Bolonkin
MHK Projects/Wave Powered Pumping of Seawater for On Shore Use...
Powered Pumping of Seawater for On Shore Use and Electrical Generation < MHK Projects Jump to: navigation, search << Return to the MHK database homepage Loading map......
Hindcast of Waves and Currents in Hurricane Katrina
Hurricane Katrina caused extensive damage to offshore oil and gas production facilities. In this study, the state-of-the-art ocean circulation (the Princeton Ocean Model) and surface wave (Wave Watch III) models, together with high-resolution ...
Dong-Ping Wang; Lie-Yauw Oey
SeaVolt Technologies formerly Sea Power Associates | Open Energy
SeaVolt Technologies formerly Sea Power Associates SeaVolt Technologies formerly Sea Power Associates Jump to: navigation, search Name SeaVolt Technologies (formerly Sea Power & Associates) Place San Francisco, California Zip CA 94111 Sector Ocean Product The company's Wave Rider system, which is still in prototype stages, uses buoys and hydraulic pumps to convert the movement of ocean waves into electricity. References SeaVolt Technologies (formerly Sea Power & Associates)[1] LinkedIn Connections CrunchBase Profile No CrunchBase profile. Create one now! This company is listed in the Marine and Hydrokinetic Technology Database. This article is a stub. You can help OpenEI by expanding it. SeaVolt Technologies (formerly Sea Power & Associates) is a company located in San Francisco, California .
We use a large, statistical set of measurements from the Wind spacecraft at 1 AU, and supporting synthetic spacecraft data based on kinetic plasma theory, to show that the compressible component of inertial range solar wind turbulence is primarily in the kinetic slow mode. The zero-lag cross-correlation C({delta}n, {delta}B{sub ||}) between proton density fluctuations {delta}n and the field-aligned (compressible) component of the magnetic field {delta}B{sub ||} is negative and close to -1. The typical dependence of C({delta}n, {delta}B{sub ||}) on the ion plasma beta {beta}{sub i} is consistent with a spectrum of compressible wave energy that is almost entirely in the kinetic slow mode. This has important implications for both the nature of the density fluctuation spectrum and for the cascade of kinetic turbulence to short wavelengths, favoring evolution to the kinetic Alfven wave mode rather than the (fast) whistler mode.
Howes, G. G.; Klein, K. G.; TenBarge, J. M. [Department of Physics and Astronomy, University of Iowa, Iowa City, IA 52242 (United States); Bale, S. D.; Chen, C. H. K.; Salem, C. S. [Space Sciences Laboratory, University of California, Berkeley, CA 94720-7450 (United States)
Ocean thermal energy conversion (OTEC) power system development (PSD) II. Preliminary design report. Appendix I: specifications and drawings
This volume contains the specifications and drawings prepared in support of the preliminary design of a 10MWe OTEC power system using enhanced plate type heat exchangers. Included are: (1) the specification tree; (2) system specification; (3) 10 MWe heat exchangers; (4) nitrogen storage, conditioning and supply subsystem specification; (5) ammonia storage, conditioning and supply specification; (6) electrical power distribution and control subsystem specification; (7) equipment valves, instruments and live lists and specifications; (8) drawing tree; (9) drawing package; and (10) 0.2 MWe test articles procurement specifications. (WHK)
Pearson, R.O.
Traveling Waves and Power Waves
... The first floor of this grand old structure houses the retail establishments. ... circuit simulators, which find it very upsetting when passive devices in the ...
Marine pastures: a by-product of large (100 megawatt or larger) floating ocean-thermal power plants. Final report
The potential biological productivity of an open-sea mariculture system utilizing the deep-sea water discharged from an ocean-thermal energy conversion (OTEC) plant was investigated. In a series of land-based studies, surface water was used to inoculate deep water and the primary production of the resultant blooms was investigated. Each cubic meter of deep water can produce approximately 2.34 g of phytoplankton protein, and that an OTEC plant discharging deep water at a rate of 4.5 x 10/sup 4/ m/sup 3/ min/sup -1/ could produce 5.3 x 10/sup 7/ kg of phytoplankton protein per 350-day year. A series of land-based shellfish studies indicated that, when fed at a constant rate of 1.83 x 10/sup -3/ g of protein per second per 70-140 g of whole wet weight, the clam, Tapes japonica, could convert the phytoplankton protein-nitrogen into shellfish meat protein-nitrogen with an efficiency of about 33 per cent. Total potential wet meat weight production from an OTEC plant pumping 4.5 x 10/sup 4/ m/sup 3/ min/sup -1/ is approximately 4.14 x 10/sup 8/ kg for a 350-day year. Various factors affecting the feasibility of open-sea mariculture are discussed. It is recommended that future work concentrate on a technical and economic analysis. (WDM)
Laurence, S.; Roels, O.A.
Marine & Hydrokinetic Technologies (Fact Sheet), Wind And Water Power Program (WWPP)
Water Power Program Water Power Program supports the development of advanced water power devices that capture energy from waves, tides, ocean currents, rivers, streams, and ocean thermal gradients. The program works to promote the development and deployment of these new tech- nologies, known as marine and hydrokinetic technologies, to assess the potential extractable energy from rivers, estuaries, and coastal waters, and to help industry harness this renew- able, emissions-free resource to generate environmentally sustainable and cost-effective electricity. The program's research and development efforts fall under two categories: Technology Development and Market Acceleration. Technology Development The Water Power Program works with industry partners, universities, and the Department of Energy's national
Wind Waves in the Coupled Climate System
The role waves play in modulating interactions between oceans and atmosphere is emphasized. All exchanges (e.g., momentum, energy, heat, mass, radiation fluxes) are influenced by the geometrical and physical characteristics of the ocean surface, which ...
L. Cavaleri; B. Fox-Kemper; M. Hemer
13.853 Computational Ocean Acoustics, Spring 2003
Wave equations for fluid and visco-elastic media. Wave-theory formulations of acoustic source radiation and seismo-acoustic propagation in stratified ocean waveguides. Wavenumber Integration and Normal Mode methods for ...
Schmidt, Henrik
On Frontal Dynamics in Two Model Oceans
Vertically homogeneous variable-temperature layer models are often used to describe upper-ocean variability, the dynamics of jets and fronts included. Frontogenesis is known to have a preference for strong cyclonic shears. When a frontal wave ...
Tor Eldevik
Estimating Oceanic Turbulence Dissipation from Seismic Images
Seismic images of oceanic thermohaline finestructure record vertical displacements from internal waves and turbulence over large sections at unprecedented horizontal resolution. Where reflections follow isopycnals, their displacements can be used ...
W. Steven Holbrook; Ilker Fer; Raymond W. Schmitt; Daniel Lizarralde; Jody M. Klymak; L. Cody Helfrich; Robert Kubichek
A new expression for the form stress term in the vertically Lagrangian mean framework for the effect of surface waves on the upper ocean circulation
There is an ongoing discussion in the community concerning the wave-averaged momentum equations in the hybrid vertically Lagrangian and horizontally Eulerian (VL) framework and, in particular, the form stress term (representing the residual effect ...
Hidenori Aiki; Richard J. Greatbatch
MHK Technologies/Wave Rider | Open Energy Information
Rider Rider < MHK Technologies Jump to: navigation, search << Return to the MHK database homepage Wave Rider.jpg Technology Profile Primary Organization Seavolt Technologies Technology Resource Click here Wave Technology Type Click here Point Absorber - Floating Technology Readiness Level Click here TRL 4 Proof of Concept Technology Description The company s Wave Rider system uses buoys and hydraulic pumps to convert the movement of ocean waves into electricity Electricity is generated via small turbines powered by hydraulic circuits which captures the energy of the wave and converts it into high pressure hydraulic fluid flow spinning the turbines to generate electricity Technology Dimensions Device Testing Date Submitted 19:42.1 << Return to the MHK database homepage
Ocean thermal energy conversion (OTEC) power system development (PSD) II. Preliminary design report. Appendix II: supporting data
The trade studies, calculations, and reports which provide the rationale for design conclusions for the 10 MWe OTEC power system are presented in this volume. These appendices include: (1) system design and optimization model; (2) system off-design performance computer model; (3) seawater system dynamics; (4) system mechanical design studies; (5) electrical design studies; (6) structural design studies; (7) tube cleaner design report and proposed brush test program; (8) heat exchangers: mechanical design; (9) heat exchangers: thermal hydraulic computer model; (10) heat exchangers: manufacturing flow plan; (11) heat exchangers: installation and removal procedures; (12) heat exchangers: stainless steel conceptual design; (13) heat exchangers: cost studies; (14)heat exchangers: materials selection and corrosion; and (15) heat exchangers: quality assurance. (WHK)
Optical fiber evanescent wave adsorption sensors for high-temperature gas sensing in advanced coal-fired power plants
Modern advanced energy systems such as coal-fired power plants, gasifiers, or similar infrastructure present some of the most challenging harsh environments for sensors. The power industry would benefit from new, ultra-high temperature devices capable of surviving in hot and corrosive environments for embedded sensing at the highest value locations. For these applications, we are currently exploring optical fiber evanescent wave absorption spectroscopy (EWAS) based sensors consisting of high temperature core materials integrated with novel high temperature gas sensitive cladding materials. Mathematical simulations can be used to assist in sensor development efforts, and we describe a simulation code that assumes a single thick cladding layer with gas sensitive optical constants. Recent work has demonstrated that Au nanoparticle-incorporated metal oxides show a potentially useful response for high temperature optical gas sensing applications through the sensitivity of the localized surface plasmon resonance absorption peak to ambient atmospheric conditions. Hence, the simulation code has been applied to understand how such a response can be exploited in an optical fiber based EWAS sensor configuration. We demonstrate that interrogation can be used to optimize the sensing response in such materials.
Buric, M.; Ohodnicky, P.; Duy, J.
Ocean energy systems. Quarterly report, October-December 1982
Research progress is reported on developing Ocean Thermal Energy Conversion (OTEC) systems that will provide synthetic fuels (e.g., methanol), energy-intensive products such as ammonia (for fertilizers and chemicals), and aluminum. The work also includes assessment and design concepts for hybrid plants, such as geothermal-OTEC (GEOTEC) plants. Another effort that began in the spring of 1982 is a technical advisory role to DOE with respect to their management of the conceptual design activity of the two industry teams that are designing offshore OTEC pilot plants that could deliver power to Oahu, Hawaii. In addition, a program is underway in which tests of a different kind of ocean-energy device, a turbine that is air-driven as a result of wave action in a chamber, are being planned. This Quarterly Report summarizes the work on the various tasks as of 31 December 1982.
MHK Technologies/Direct Drive Power Generation Buoy | Open Energy
Power Generation Buoy Power Generation Buoy < MHK Technologies Jump to: navigation, search << Return to the MHK database homepage Direct Drive Power Generation Buoy.jpg Technology Profile Primary Organization Columbia Power Technologies Inc Technology Resource Click here Wave Technology Type Click here Point Absorber - Floating Technology Readiness Level Click here TRL 4 Proof of Concept Technology Description Direct drive point absorber In 2005 Oregon State University entered into an exclusive license agreement with Columbia Power Technologies to jointly develop a direct drive wave energy conversion device Designed to be anchored 2 5 miles off the Oregon coast in 130 feet of water it uses the rise and fall of ocean waves to generate electricity Mooring Configuration Anchored
Impact of Typhoons on the Ocean in the Pacific: ITOP
Tropical cyclones (TCs) change the ocean by mixing deeper water into the surface layers, by the direct air–sea exchange of moisture and heat from the sea surface, and by inducing currents, surface waves, and waves internal to the ocean. In turn, the ...
E.A. D'Asaro; P.G. Black; L.R. Centurioni; Y.-T. Chang; S.S. Chen; R. C. Foster; H.C. Graber; P. Harr; V. Hormann; R.-C. Lien; I.-I. Lin; T.B. Sanford; T.-Y. Tang; C.-C. Wu
Grays Harbor Ocean Energy Company | Open Energy Information
Ocean Energy Company Ocean Energy Company Jump to: navigation, search Name Grays Harbor Ocean Energy Company Place Seattle, Washington Zip 98105 Sector Renewable Energy, Wind energy Product Grays Harbor has started a demonstration project for offshore wind/wave renewable power generation in Washington State and has applied for up to 1GW in permits for wave projects around the US. Coordinates 47.60356°, -122.329439° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":47.60356,"lon":-122.329439,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}
SWIMSAT: A Real-Aperture Radar to Measure Directional Spectra of Ocean Waves from Space—Main Characteristics and Performance Simulation
The project SWIMSAT aims to measure the directional spectra of waves from space using a real-aperture radar with a low-incidence, conical-scanning beam. This system's design is based on airborne versions developed in France and the United States. ...
Daničle Hauser; Elbatoul Soussi; Eric Thouvenot; Laurent Rey
Ocean Datasets | Data.gov
Ocean Datasets Ocean Data Tools Technical Guide Map Gallery Regional Planning Feedback Ocean You are here Data.gov Communities Ocean Ocean, Coast, and Great Lakes Planning...
Riding the Crest: A Tale of Two Wave Experiments
This paper gives a general overview of two ocean wave experiments. The experimental goals of the Surface Wave Processes Program (SWAPP) and of the Surface Wave Dynamics Experiment (SWADE) are quite different but complementary. In general terms, ...
R. A. Weller; M. A. Donelan; M. G. Briscoe; N. E. Huang
The Evolution of Inhomogeneous Wave Statistics through a Variable Medium
The interaction of ocean waves with variable currents and topography in coastal areas can result in inhomogeneous statistics because of coherent interferences, which affect wave-driven circulation and transport processes. Stochastic wave models, ...
P. B. Smit; T. T. Janssen
A Global Climatology of Wind–Wave Interaction
Generally, ocean waves are thought to act as a drag on the surface wind so that momentum is transferred downward, from the atmosphere into the waves. Recent observations have suggested that when long wavelength waves—which are characteristic of ...
Kirsty E. Hanley; Stephen E. Belcher; Peter P. Sullivan
Shock Waves in Currents and Outflows
Shock waves are discontinuities (in the physical properties of a fluid) which behave in an organized manner. The possibility that such waves may occur in oceanic boundary currents is examined with a nonlinear two-layer analytical model. Attention ...
Doron Nof
Wave Breaking Dissipation Observed with "SWIFT" Drifters
Energy dissipation rates during ocean wave breaking are estimated from high-resolution profiles of turbulent velocities collected within 1 m of the surface. The velocity profiles are obtained from a pulse-coherent acoustic Doppler sonar on a wave-...
Jim Thomson
The Dynamic Balance of Internal Waves
For oceanic internal waves with vertical scales larger than 1 m the evolution of the spectrum is adequately described by weak-interaction theory. Based on simple physical arguments, a model for internal-wave energy dissipation predicts ...
C. Henry McComas; Peter Müller
Energy Basics: Power Tower Systems for Concentrating Solar Power
Energy Basics Renewable Energy Printable Version Share this resource Biomass Geothermal Hydrogen Hydropower Ocean Solar Photovoltaics Concentrating Solar Power Linear...
MHK Technologies/CETO Wave Energy Technology | Open Energy Information
Wave Energy Technology Wave Energy Technology < MHK Technologies Jump to: navigation, search << Return to the MHK database homepage CETO Wave Energy Technology.png Technology Profile Primary Organization Carnegie Wave Energy Limited Project(s) where this technology is utilized *MHK Projects/CETO La Reunion *MHK Projects/CETO3 Garden Island *MHK Projects/Perth Wave Energy Project PWEP Technology Resource Click here Wave Technology Type Click here Point Absorber Technology Readiness Level Click here TRL 7/8: Open Water System Testing & Demonstration & Operation Technology Description The CETO system distinguishes itself from other wave energy devices by operating out of sight and being anchored to the ocean floor. Each CETO unit consists of a pump unit moored to the ocean floor and connected to a submerged Buoyant Actuator via a tether. The Buoyant Actuator moves in an orbital motion, in harmony with the wave, capturing the power of the passing waves. The Buoyant Actuator is connected to a tether (marine rope) that creates a vertical upward force which actuates the seabed mounted piston pump. This force pressurises fluid in the CETO system. The high pressure fluid is then sent ashore via a subsea pipeline. Onshore the fluid passes through a standard hydroelectric turbine to generate zero-emission electricity and/or through a reverse osmosis plant to directly create zero-emission desalinated water (replacing greenhouse gas emitting electrically driven pumps usually required for such plants). The fluid is then re-circulated at low-pressure to the CETO units offshore creating a closed-loop system. The generation capacity of CETO projects is scalable. To increase the project capacity additional units can be added offshore and connected back to a larger power house onshore.
Polarized radiance fields under a dynamic ocean surface: a three-dimensional radiative transfer solution
The hybrid matrix operator, Monte Carlo (HMOMC) method previously reported [Appl. Opt.47, 1063-1071 (2008)APOPAI0003-693510.1364/AO.47.001063] is improved by neglecting higher-order terms in the coupling of the matrix operators and by introducing a dual grid scheme. The computational efficiency for solving the vector radiative transfer equation in a full 3D coupled atmosphere-surface-ocean system is substantially improved, and, thus, large-scale simulations of the radiance distribution become feasible. The improved method is applied to the computation of the polarized radiance field under realistic surface waves simulated by the power spectral density method. To the authors' best knowledge, this is the first time that the polarized radiance field under a dynamic ocean surface and the underwater image of an object above such an ocean surface have been reported.
You Yu; Zhai Pengwang; Kattawar, George W.; Yang Ping
Role of Gravity Waves in Triggering Deep Convection during TOGA COARE
The role of gravity waves in the initiation of convection over oceanic regions during the Tropical Ocean Global Atmosphere Coupled Ocean–Atmosphere Response Experiment (TOGA COARE) experiment is investigated. First, an autocorrelation method is ...
C. Lac; J-P. Lafore; J-L. Redelsperger
Program on Technology Innovation: Validation of CLASSI and SASSI Codes to Treat Seismic Wave Incoherence in Soil-Structure Interacti on (SSI) Analysis of Nuclear Power Plant Structures
The New Plant Seismic Issues Resolution Program was initiated to address emerging seismic issues as they relate to the design of new nuclear power plants. Task S2.1 of the program is a multi-phase research project to assess the effects of seismic wave incoherence on the response of foundations and structures similar to those being considered for advanced reactor designs. The initial phases of this task focused on the objective of systematically studying seismic wave incoherence effects on structures/fo...
Energy Basics: Concentrating Solar Power
Adjusting Internal Model Errors through Ocean State Estimation
Oceanic state estimation is a powerful tool to estimate internal model parameters simultaneously with the model's initial conditions and surface forcing field that jointly would bring a model into consistency with time-varying large-scale ocean ...
Detlef Stammer
Atmospheric and Oceanic Simulation
Introduction It is widely recognized that internal tides have strong influence on the global thermohaline circulation, because it contribute significantly to deep ocean mixing, the essential process for the maintenance of the thermohaline circulation [Munk and Wunsch, 1998]. Internal tides generated by strong tide-topography interactions occasionally break causing intense turbulent mixing [Lien and Gregg, 2001]. Turbulent mixing may also be induced far from wave generation sites, because propagating internal tides can nonlinearly interact with the background internal waves and cascade part of their energy down to small scales where breaking can occur. The East China Sea and adjacent seas are one of the most important generation regions of internal tides, and hence the associated turbulent mixing. Indeed, using a two-dimensional analytical model, Baines [1982] predicted that the continental shelf slope in the East China Sea is the second largest generator of the M 2 internal tide amon
Niwa; Group Representative
Water Power for a Clean Energy Future (Fact Sheet)
This fact sheet provides an overview of the U.S. Department of Energy's Wind and Water Power Program's water power research activities. Water power is the nation's largest source of clean, domestic, renewable energy. Harnessing energy from rivers, manmade waterways, and oceans to generate electricity for the nation's homes and businesses can help secure America's energy future. Water power technologies fall into two broad categories: conventional hydropower and marine and hydrokinetic technologies. Conventional hydropower facilities include run-of-the-river, storage, and pumped storage. Most conventional hydropower plants use a diversion structure, such as a dam, to capture water's potential energy via a turbine for electricity generation. Marine and hydrokinetic technologies obtain energy from waves, tides, ocean currents, free-flowing rivers, streams and ocean thermal gradients to generate electricity. The United States has abundant water power resources, enough to meet a large portion of the nation's electricity demand. Conventional hydropower generated 257 million megawatt-hours (MWh) of electricity in 2010 and provides 6-7% of all electricity in the United States. According to preliminary estimates from the Electric Power Resource Institute (EPRI), the United States has additional water power resource potential of more than 85,000 megawatts (MW). This resource potential includes making efficiency upgrades to existing hydroelectric facilities, developing new low-impact facilities, and using abundant marine and hydrokinetic energy resources. EPRI research suggests that ocean wave and in-stream tidal energy production potential is equal to about 10% of present U.S. electricity consumption (about 400 terrawatt-hours per year). The greatest of these resources is wave energy, with the most potential in Hawaii, Alaska, and the Pacific Northwest. The Department of Energy's (DOE's) Water Power Program works with industry, universities, other federal agencies, and DOE's national laboratories to promote the development and deployment of technologies capable of generating environmentally sustainable and cost-effective electricity from the nation's water resources.
Interdecadal Sea Surface Temperature Variability in the Equatorial Pacific Ocean. Part II: The Role of Equatorial/Off-Equatorial Wind Stresses in a Hybrid Coupled Model
Many modeling studies have been carried out to investigate the role of oceanic Rossby waves linking the off-equatorial and equatorial Pacific Ocean. Although the equatorial ocean response to off-equatorial wind stress forcing alone tends to be ...
Equatorial Wave-Mean Flow Interaction: The Long Rossby Waves
The interaction of long equatorial Rossby waves with mean zonal currents in the ocean is investigated in a continuously stratified finite difference numerical model. The model allows for realistic specification of the mean state including both ...
Jeffrey A. Proehl
Wave Attenuation and Wave Drift in the Marginal Ice Zone
Surface gravity waves in a viscous rotating ocean are studied theoretically when they penetrate an area covered by highly concentrated brashlike ice. The motion is described by a Lagrangian formulation, and the brash is modeled by a viscous ...
Jan Erik Weber
Ocean Thermal Energy Conversion
A process called ocean thermal energy conversion (OTEC) uses the heat energy stored in the Earth's oceans to generate electricity.
Correction of Amplitudes of Bragg Lines in the Sea Echo Doppler Spectrum of an Ocean Radar
Amplitudes of Bragg lines in the Doppler spectrum of high frequency or very high frequency (VHF) ocean radar sea echoes are important because they are used in normalizing the second-order scattering when calculating ocean wave spectra. These ...
Yukiharu Hisaki
Dimensionally Consistent Similarity Relation of Ocean Surface Friction Coefficient in Mixed Seas
Applying wavelength scaling, dimensionally consistent expressions of the ocean surface friction coefficient can be developed for both wind sea and mixed sea in the ocean. For a wind sea with a monopeak wave spectrum, the natural choice of the ...
Paul A. Hwang; Héctor García-Nava; Francisco J. Ocampo-Torres
Comparison of two and three spatial dimensional solutions of a parabolic approximation of the wave equation at ocean?basin scales in the presence of internal waves: 200–250 Hz.
Numerical solutions are given for a parabolic approximation to the acoustic waveequation at 200 and 250 Hz in two and three spatial dimensions to determine if azimuthal coupling in the horizontal coordinate significantly affects horizontal correlation in the presence of internal gravity waves in the sea. Coupling is a small effect at distances of 4000 km or less. This implies that accurate solutions are possible using computations from uncoupled vertical slices. Shapes of horizontal correlation are not far from shapes given by several theories. Estimates of horizontal correlation at 4000 km and 200 and 250 Hz are about 0.4 and 0.3 km
John Spiesberger
Numerical Simulation of Internal Kelvin Waves and Coastal Upwelling Fronts
Two three-dimensional primitive equation numerical ocean models are applied to the problem of internal Kelvin waves and coastal upwelling in the Great Lakes. One is the Princeton Ocean Model (POM) with a terrain-following (sigma) vertical ...
Dmitry Beletsky; William P. O'Connor; David J. Schwab; David E. Dietrich
RFI Comments - Wave Systems
... These attacks, such as those planted by rootkits ... PwC leveraged the power of TPMs to ... Wave EMBASSY® Remote Administration Server (ERAS) has ...
PowerPoint ?????????
Yongchen Song Dalian University of Technology Dalian, Liaoning China firstname.lastname@example.com 13889533878 CO 2 Reduction and Ocean Storage Background CO 2 Storage Technology ...
Ocean Map | Data.gov
Map Ocean Data Tools Technical Guide Map Gallery Regional Planning Feedback Ocean You are here Data.gov Communities Ocean Map Gallery Planning for ocean, coastal, and Great...
Massachusetts Ocean Management Plan (Massachusetts) | Department of Energy
Massachusetts Ocean Management Plan (Massachusetts) Massachusetts Ocean Management Plan (Massachusetts) Massachusetts Ocean Management Plan (Massachusetts) < Back Eligibility Construction Industrial Installer/Contractor Investor-Owned Utility Municipal/Public Utility Rural Electric Cooperative Utility Savings Category Water Buying & Making Electricity Wind Program Info State Massachusetts Program Type Siting and Permitting Provider Executive Office of Energy and Environmental Affairs The Massachusetts Ocean Act of 2008 required the state's Secretary of Energy and Environmental Affairs to develop a comprehensive ocean management plan for the state by the end of 2009. That plan identified certain state waters that are eligible for offshore wind, wave and tidal energy development and other state waters where such development is
Numerical performance prediction for FAU's first generation ocean current turbine.
??This thesis presents the analytically predicted position, motion, attitude, power output and forces on Florida Atlantic University's (FAU) first generation ocean current turbine for a… (more)
Vanrietvelde, Nicolas.
?? This thesis presents the analytically predicted position, motion, attitude, power output and forces on Florida Atlantic University's (FAU) first generation ocean current turbine for… (more)
Vanrietvelde, Nicolas
Hawaii Ocean Current Resources and Tidal Turbine Assessment
Interest in converting the kinetic energy of ocean current and tidal flow into electrical power has increased in recent years. This report focuses on the ocean current resource in Hawaii, which includes tidal flows as well as uni-directional oceanic current flows around the main Hawaiian Islands, with the exception of Kauai, from the shoreline to approximately the 2000-m depth contour.
Evolution of Persistent Wave Groups
During the near-field leg of the Hawaiian Ocean-Mixing Experiment (HOME-NF), short, steep surface wave groups were observed that elicited strong group-forced responses in the wave-filtered surface current field, as reported by Smith. Some of ...
Jerome A. Smith; Coralie Brulefert
Marine pastures: a by-product of large (100 megawatt or larger) floating ocean thermal power plants. Progress report, February 1, 1976--April 30, 1976
Computer programs have been developed to define the temperature increase which would be needed to bring deep-ocean water into density equilibrium with surface water for locations where data are available. A series of continuous-flow studies on phytoplankton blooms resulting from mixtures of 80 percent deep and 20 percent surface water in 2000-liter concrete culturing vessels (''reactors'') has been completed. A quantitative determination of nutrient utilization and flow through a combined primary and secondary trophic level system has been completed. This study utilized the clam Tapes semidecussata, fed from phytoplankton grown in 80 percent deep and 20 percent surface water. An analysis of the fate of the deep water discharged from a floating OTEC plant indicates that horizontal containment of the resulting deep water: surface water mixture is necessary if conditions optimal for open-sea mariculture are to obtain. The design of a small open-ocean ''pool'' is in the final stages of completion. A combined mussel/oyster/clam system is in the final stages of design and will be placed in the ocean during April 1976. (WDM)
Roels, O.A.
The Ventilated Ocean
Adiabatic theories of ocean circulation and density structure have a long tradition, from the concept of the ventilated thermocline to the notion that deep ocean ventilation is controlled by westerly winds over the Southern Ocean. This study ...
Patrick Haertel; Alexey Fedorov
On Scatterometer Ocean Stress
Scatterometers estimate the relative atmosphere–ocean motion at spatially high resolution and provide accurate inertial-scale ocean wind forcing information, which is crucial for many ocean, atmosphere, and climate applications. An empirical ...
M. Portabella; A. Stoffelen
MHK Technologies/Wave Energy Seawater Transmission WEST | Open Energy
Wave Energy Seawater Transmission WEST Wave Energy Seawater Transmission WEST < MHK Technologies Jump to: navigation, search << Return to the MHK database homepage Wave Energy Seawater Transmission WEST.jpg Technology Profile Primary Organization Atmocean Inc Project(s) where this technology is utilized *MHK Projects/WEST Testing Technology Resource Click here Wave Technology Type Click here Point Absorber Technology Readiness Level Click here TRL 1-3: Discovery / Concept Definition / Early Stage Development & Design & Engineering Technology Description Atmocean WEST efficiently captures wave energy by deploying many inexpensive devices across large ocean regions. By using hydraulic transmission, WEST avoids the high cost of seafloor power lines, generating electricity onshore to achieve higher reliability at lower cost. When WEST is combined with Bright Energy Storage Technologies seafloor compressed air energy storage (CAES) system, the two enable base load renewable power (eliminating the need for backup fossil-fuel power) at a projected levelized cost of electricity (LCOE) of $.08/kWh to $.12/kWh.
Water Power Forum | OpenEI Community
Water Power Forum Water Power Forum Home > Water Power Forum > Posts by term Content Group Activity By term Q & A Feeds CBS (1) community (1) Cost (1) Current (1) current energy (1) DOE (1) forum (1) gateway (1) GMREC (1) LCOE (2) levelized cost of energy (1) marine energy (1) MHK (1) numerical modeling (1) ocean energy (1) OpenEI (1) Performance (1) Tidal (1) Water power (1) Wave (1) Groups Menu You must login in order to post into this group. Recent content MHK LCOE Reporting Guidance Draft MHK Cost Breakdown Structure Draft Global Marine Renewable Energy Conference (GMREC) OpenEI launches new Water Power Gateway and Community Forum Group members (8) Managers: Graham7781 Recent members: Gdavis Jim mcveigh Ocop Thomas.heibel NickL Kch Rmckeel 429 Throttled (bot load) Error 429 Throttled (bot load)
Low-Frequency Barotropic Scattering on a Shelf Bordering an Ocean
BY restricting attention to low frequencies this note solves the problem of continental shelf waves scattered at an abrupt change in width of an exponential shelf abutting a flat open ocean. Short reflected waves are treated by removing their ...
E. R. Johnson
Ocean | Open Energy Information
Jump to: navigation, search TODO: Add description Related Links List of Ocean Thermal Incentives Retrieved from "http:en.openei.orgwindex.php?titleOcean&oldid273467"...
Simulations of the Ocean Response to a Hurricane: Nonlinear Processes
Superinertial internal waves generated by a tropical cyclone can propagate vertically and laterally away from their local generation site and break, contributing to turbulent vertical mixing in the deep ocean and maintenance of the stratification ...
Sarah E. Zedler
How Much Energy Propagates Vertically in the Equatorial Oceans?
Vertically propagating linear wave calculations using realistic equatorial buoyancy profiles are presented which show the percentage of the downward surface energy flux that reaches the deep equatorial oceans. The percentages vary widely ...
Peter R. Gent; James R. Luyten
Normal-Mode Decomposition of Small-Scale Oceanic Motions
Small-scale oceanic motions consist of vortical motion and internal waves. In a linear or weakly nonlinear system these two types of motions can be unambiguously separated using normal-mode decomposition in which the vortical mode carries the ...
Ren-Chieh Lien; Peter Müller
The Role of Internal Tides in Mixing the Deep Ocean
Internal wave theory is used to examine the generation, radiation, and energy dissipation of internal tides in the deep ocean. Estimates of vertical energy flux based on a previously developed model are adjusted to account for the influence of ...
Louis St. Laurent; Chris Garrett
Ocean Response to a Hurricane. Part I: Observations
The response of the ocean to hurricanes was investigated using aircraft-deployable expendable current profilers (AXCP). The goals were to observe and separate the surface wave and surface mixed layer (SML) velocities under the storms and to map ...
Thomas B. Sanford; Peter G. Black; James R. Haustein; James W. Feeney; George Z. Forristall; James F. Price
Simulation of propagating EAS Cherenkov radiation over the ocean surface
We present computing results of the Cherenkov light propagation in air and water from extensive air showers developing over the ocean. Limits on zenith angles of the showers, at which the registration of flashes of reflected Cherenkov photons by the satellite-based detector TUS is possible, are analyzed with consideration for waves on the ocean surface.
Shustova, O P; Khrenov, B A
Robots on Waves By Cianna Beltran, Editor
. The Wave Glider is about the size of a surfboard with a wave-based propulsion system and two solar panels that move across the ocean measuring weather and water quality. The goal is that these robot wave riders such as water quality and weather conditions. Photo courtesy of http://liquidr.com/ #12;Page 2Seawords, December
Continuous wave Nd:YAG laser cladding modeling: A physical study of track creation during low power processing
This paper concerns the modeling of cladding using an Nd:YAG laser operating at low powers typically less than 800 W. Experimental observation of the evolution of the mass of the clads shows two power thresholds. The theoretical study relies on a calculation of the fluence provided to the substrate and on a model of heat transfer into the substrate. The authors suggest that the first threshold is the power required for substrate melting. The second power is the threshold when the powder is directly melted by the beam and is therefore a liquid when contacting the substrate.
Jouvard, J.M.; Grevey, D.F.; Lemoine, F. [IUT du Creusot, Le Creusot (France); Vannes, A.B. [ECL, Ecully (France)
Mass Transport Velocity in Free Barotropic Poincaré Waves
The mass transport velocity induced by long surface waves in a shallow, rotating viscous ocean is studied theoretically by using a Lagrangian description of motion. The depth is constant, and the water is homogeneous. Such waves are referred to ...
Frode Hřydalsvik; Jan Erik Weber
Measurement of Directional Wave Spectra Using Aircraft Laser Altimeters
A remote sensing method to measure directional oceanic surface waves by three laser altimeters on the NOAA LongEZ aircraft is investigated. To examine feasibility and sensitivity of the wavelet analysis method to various waves, aircraft motions, ...
J. Sun; S. P. Burns; D. Vandemark; M. A. Donelan; L. Mahrt; Timothy L. Crawford; T. H. C. Herbers; G. H. Crescenti; J. R. French
Low-Frequency Baroclinic Waves off Coastal Boundaries
The behavior of low-frequency baroclinic Rossby wave motion in the vicinity of coastal boundaries is investigated using linearized modulated wave theory in a stratified, constant-depth, equatorial ?-plane ocean. A primary objective is to obtain ...
R. Grimshaw; J. S. Allen
Observations of Wave Breaking Kinematics in Fetch-Limited Seas
Breaking waves play an important role in air–sea interaction, enhancing momentum flux from the atmosphere to the ocean, dissipating wave energy that is then available for turbulent mixing, injecting aerosols and sea spray into the atmosphere, and ...
Jessica M. Kleiss; W. Kendall Melville
Preliminary Assessment and Use of ERS-1 Altimeter Wave Data
The satellite ERS-1, launched in July 1991, carries a radar altimeter that provides collocated measurements of significant wave height and wind speed over the oceans. During the calibration period, significant wave height and wind speed ...
S. J. Foreman; M. W. Holt; S. Kelsall
On the Energy Input from Wind to Surface Waves
A basic model relating the energy dissipation in the ocean mixed layer to the energy input into the surface wave field is combined with recent measurements of turbulent kinetic energy dissipation to determine the average phase speed of the waves ...
J. R. Gemmrich; T. D. Mudge; V. D. Polonichko
A Modification of the Garrett–Munk Internal Wave Spectrum
The Garrett–Munk (GM) spectrum continues to be a useful description of the oceanic internal wave field. However, there are several inconsistencies and ambiguities that make it difficult to use in comparing internal wave fields at different ...
Murray D. Levine
PowerPoint Presentation
resolved Power capture and conversion in line with prediction 11 CF16539GG 1 OCEAN POWER DELIVERY LTD PROJECTS 12 CF16539GG 1 Enersis - Project 1 Enersis Portugal's largest...
Cycloidal Wave Energy Converter
This program allowed further advancing the development of a novel type of wave energy converter, a Cycloidal Wave Energy Converter or CycWEC. A CycWEC consists of one or more hydrofoils rotating around a central shaft, and operates fully submerged beneath the water surface. It operates under feedback control sensing the incoming waves, and converts wave power to shaft power directly without any intermediate power take off system. Previous research consisting of numerical simulations and two dimensional small 1:300 scale wave flume experiments had indicated wave cancellation efficiencies beyond 95%. The present work was centered on construction and testing of a 1:10 scale model and conducting two testing campaigns in a three dimensional wave basin. These experiments allowed for the first time for direct measurement of electrical power generated as well as the interaction of the CycWEC in a three dimensional environment. The Atargis team successfully conducted two testing campaigns at the Texas A&M Offshore Technology Research Center and was able to demonstrate electricity generation. In addition, three dimensional wave diffraction results show the ability to achieve wave focusing, thus increasing the amount of wave power that can be extracted beyond what was expected from earlier two dimensional investigations. Numerical results showed wave cancellation efficiencies for irregular waves to be on par with results for regular waves over a wide range of wave lengths. Using the results from previous simulations and experiments a full scale prototype was designed and its performance in a North Atlantic wave climate of average 30kW/m of wave crest was estimated. A full scale WEC with a blade span of 150m will deliver a design power of 5MW at an estimated levelized cost of energy (LCOE) in the range of 10-17 US cents per kWh. Based on the new results achieved in the 1:10 scale experiments these estimates appear conservative and the likely performance at full scale will exceed this initial performance estimates. In advancing the Technology Readiness Level (TRL) of this type of wave energy converter from 3 to 4, we find the CycWEC to exceed our initial estimates in terms of hydrodynamic performance. Once fully developed and optimized, it has the potential to not just outperform all other WEC technologies, but to also deliver power at a lower LCOE than competing conventional renewables like wind and solar. Given the large wave power resource both domestically and internationally, this technology has the potential to lead to a large improvement in our ability to produce clean electricity at affordable cost.
Stefan G. Siegel, Ph.D.
Theory of intense radio waves in an underdense ionosphere: application to solar power satellite transmissions. Final report
The instabilities in the F-region plasma are investigated that can be created by the passage of a solar power satellite beam (2.45 Ghz frequency, at a power flux of 23 mW/cm/sup 2/) at frequencies much higher than the cut-off plasma frequency of the ionosphere. The threshold geometry and frequency and intensity scaling laws are calculated for the thermal self-focusing instability, and its saturation level is estimated. The possibility is considered of scaled experiments at HF power to detect the thermal self-focusing instability for an underdense ionosphere. Other experimental possibilities are discussed in terms of the scaling laws. (LEW)
Goldman, M.V.
Hydropower and Ocean Energy Resources and Technologies | Department of
Hydropower and Ocean Energy Resources and Technologies Hydropower and Ocean Energy Resources and Technologies Hydropower and Ocean Energy Resources and Technologies October 7, 2013 - 9:29am Addthis Photo of water flowing from several openings in a hydropower dam. Hydropower produces 10% of the nation's energy, including power from the Ice Harbor Dam in Burbank, Washington. This page provides a brief overview of hydropower and ocean energy resources and technologies supplemented by specific information to apply these technologies within the Federal sector. Overview Hydropower has been used for centuries to power machinery, but the application most commonly associated with hydropower is electricity production through dams. Ocean energy refers to various forms of renewable energy harnessed from the ocean. There are two primary types of ocean energy: mechanical and thermal.
Ocean Thermal Energy Conversion Basics | Department of Energy
Thermal Energy Conversion Basics Thermal Energy Conversion Basics Ocean Thermal Energy Conversion Basics August 16, 2013 - 4:22pm Addthis A process called ocean thermal energy conversion (OTEC) uses the heat energy stored in the Earth's oceans to generate electricity. OTEC works best when the temperature difference between the warmer, top layer of the ocean and the colder, deep ocean water is about 36°F (20°C). These conditions exist in tropical coastal areas, roughly between the Tropic of Capricorn and the Tropic of Cancer. To bring the cold water to the surface, ocean thermal energy conversion plants require an expensive, large-diameter intake pipe, which is submerged a mile or more into the ocean's depths. Some energy experts believe that if ocean thermal energy conversion can become cost-competitive with conventional power technologies, it could be
Introduction to Ocean Waves Rick Salmon
Kong firstname.lastname@example.com W. K. Chan City University of Hong Kong Tat Chee Avenue, Hong Kong firstname.lastname@example.com T. H. Tse The University of Hong Kong Pokfulam, Hong Kong email@example.com Abstract--An effective [14], further uses a tie- breaker to resolve statements having the same suspiciousness values so
Salmon, Rick
About Ocean Community | Data.gov
About Ocean Community Ocean Data Tools Technical Guide Map Gallery Regional Planning Feedback Ocean You are here Data.gov Communities Ocean About Ocean Community This...
... by tracking propagation of acoustic plane waves in a ... of the robustness of plane wave propagation to ... for GHG monitoring in power plant stacks and ...
Internal Waves in Monterey Submarine Canyon
Velocity, temperature, and salinity profile surveying in Monterey Submarine Canyon during spring tide reveals an internal wave field almost an order of magnitude more energetic than that in the open ocean. Semidiurnal fluctuations and their ...
Eric Kunze; Leslie K. Rosenfeld; Glenn S. Carter; Michael C. Gregg
Temperature Advection by Tropical Instability Waves
A numerical model of the tropical Pacific Ocean is used to investigate the processes that cause the horizontal temperature advection of tropical instability waves (TIWs). It is found that their temperature advection cannot be explained by the ...
Markus Jochum; Raghu Murtugudde
Ocean Technical | Data.gov
Ocean Data Tools Technical Guide Map Gallery Regional Planning Feedback Ocean You are here Data.gov Communities Ocean Technical Community of Practice Through a variety of...
Sea-State-Dependent Momentum Fluxes for Ocean Modeling
The impact of wave-dependent surface stress on the ocean circulation has been studied using surface stresses calculated from a numerical wave model. The main questions to be investigated were what the effect would be on the Ekman currents in the ...
Řyvind Saetra; Jon Albretsen; Peter A. E. M. Janssen
Ocean Thermal Energy Conversion: An overview
Ocean thermal energy conversion, or OTEC is a technology that extracts power from the ocean's natural thermal gradient. This technology is being pursued by researchers from many nations; in the United States, OTEC research is funded by the US Department of Energy's Ocean Energy Technology program. The program's goal is to develop the technology so that industry can make a competent assessment of its potential -- either as an alternative or as a supplement to conventional energy sources. Federally funded research in components and systems will help OTEC to the threshold of commercialization. This publication provides an overview of the OTEC technology. 47 refs., 25 figs.
Wind Energy Input to the Surface Waves
Wind energy input into the ocean is primarily produced through surface waves. The total rate of this energy source, integrated over the World Ocean, is estimated at 60 TW, based on empirical formulas and results from a numerical model of surface ...
Wei Wang; Rui Xin Huang
Energy Basics: Wind Power Animation
Energy Basics Renewable Energy Printable Version Share this resource Biomass Geothermal Hydrogen Hydropower Ocean Solar Wind Wind Turbines Wind Resources Wind Power...
Ocean thermal energy conversion plants : experimental and analytical study of mixing and recirculation
Ocean thermal energy conversion (OTEC) is a method of generating power using the vertical temperature gradient of the tropical ocean as an energy source. Experimental and analytical studies have been carried out to determine ...
Jirka, Gerhard H.
Scattering of Internal Waves at Finite Topography in Two Dimensions. Part II: Spectral Calculations and Boundary Mixing
The scattering of internal gravity waves at finite topography is studied theoretically and numerically for a two-dimensional finite-depth ocean. In Part I a single incident plane wave was considered. Here a random superposition of incident waves ...
Peter Müller; Xianbing Liu
Ocean Thermal Energy Conversion power system development. Phase I: preliminary design. Final report. [ODSP-3 code; OTEC Steady-State Analysis Program
The following appendices are included; Dynamic Simulation Program (ODSP-3); sample results of dynamic simulation; trip report - NH/sub 3/ safety precautions/accident records; trip report - US Coast Guard Headquarters; OTEC power system development, preliminary design test program report; medium turbine generator inspection point program; net energy analysis; bus bar cost of electricity; OTEC technical specifications; and engineer drawings. (WHK)
Observations of Large-Amplitude Nonlinear Internal Waves from a Drifting Array: Instruments and Methods
This paper presents a novel methodology applied to the observation of large-amplitude nonlinear internal waves in the upper ocean from an array of drifting instruments. The characteristics of the instrument used—an Autonomous Drifting Ocean ...
L. R. Centurioni
Wave-Driven Wind Jets in the Marine Atmospheric Boundary Layer
The interaction between ocean surface waves and the overlying wind leads to a transfer of momentum across the air–sea interface. Atmospheric and oceanic models typically allow for momentum transfer to be directed only downward, from the ...
Kirsty E. Hanley; Stephen E. Belcher
Microsoft Word - G0421-ReedsportWavePark-CX.doc
7, 2011 7, 2011 REPLY TO ATTN OF: KEC-4 SUBJECT: Environmental Clearance Memorandum John Schaad Customer Service Engineering - TPC-ALVEY Proposed Action: Reedsport OPT Wave Park Generation Integration (G0421) Budget Information: Work Order # 246379, Task # 03 Categorical Exclusions Applied (from Subpart D, 10 C.F.R. Part 1021): B1.7: "Acquisition, installation, operation, and removal of communication systems..." B4.6: "Additions or modifications to electric power transmission facilities that would not affect the environment beyond the previously developed facility area..." Location: Douglas County, Oregon Proposed by: Douglas Electric Cooperative (DEC), Bonneville Power Administration (BPA) Description of the Proposed Action: Ocean Power Technologies, Inc. (OPT) has requested to
Numerical investigation of the physical model of a high-power electromagnetic wave in a magnetically insulated transmission line
An efficient numerical code for simulating the propagation of a high-power electromagnetic pulse in a vacuum transmission line is required to study the physical phenomena occurring in such a line, to analyze the operation of present-day megavolt generators at an {approx}10-TW power level, and to design such new devices. The main physical theoretical principles are presented, and the stability of flows in the near-threshold region at the boundary of the regime of magnetic self-insulation is investigated based on one-dimensional telegraph equations with electron losses. Numerical (difference) methods-specifically, a method of characteristics and a finite-difference scheme-are described and their properties and effectiveness are compared by analyzing the high-frequency modes.
Samokhin, A. A. [Troitsk Institute for Innovation and Fusion Research (Russian Federation)
Ocean shell noises
Ocean shell noises Name: Rick A Cazzato Location: NA Country: NA Date: NA Question: Why do you here noises when you put a ocean shell to your ear? Does this happen because of...
Mixing by ocean eddies
Mesoscale eddies mix and transport tracers such as heat and potential vorticity laterally in the ocean. While this transport plays an important role in the climate system, especially in the Southern Ocean, we lack a, ...
Abernathey, Ryan (Ryan Patrick)
Water Power Forum Water Power Forum Home > Features > Groups Content Group Activity By term Q & A Feeds Content type Blog entry Discussion Document Event Poll Question Keywords Author Apply NickL Hi Vanessa-I connected wit... Posted by: NickL 13 Dec 2013 - 14:38 Hi Vanessa- I connected with one of our MHK experts regarding your question, please see his responses below: 1. There was only one US commercial deployment (selling power to a utility) in... Vanessa.gregory 2013 projects and funding Posted by: Vanessa.gregory 13 Dec 2013 - 09:12 Good morning, I am researching energy generation from waves, tides, ocean currents, and marine thermal gradients for a report and I am looking for two specific sets of information. 1. Any new U.... Alison.labonte Comments on MHK Cost Reduction Pathway White Papers
Wave Dragon
Overtopping Wave Devices Wave Dragon ApSLtd HWETTEI - Workshop October 26-28, 2005, Washington, DC Hydrokinetic Technologies Technical and Environmental Issues Workshop the Wave...
Measurements of Ocean Surface Backscattering Using an Airborne 94-GHz Cloud Radar—Implication for Calibration of Airborne and Spaceborne W-Band Radars
Backscattering properties of the ocean surface have been widely used as a calibration reference for airborne and spaceborne microwave sensors. However, at millimeter-wave frequencies, the ocean surface backscattering mechanism is still not well ...
Lihua Li; Gerald M. Heymsfield; Lin Tian; Paul E. Racette
MHK Technologies/Current Power | Open Energy Information
Power Power < MHK Technologies Jump to: navigation, search << Return to the MHK database homepage Current Power.jpg Technology Profile Primary Organization Current Power AB Project(s) where this technology is utilized *MHK Projects/Norde lv Technology Resource Click here Current/Tidal Technology Type Click here Cross Flow Turbine Technology Readiness Level Click here TRL 1-3: Discovery / Concept Definition / Early Stage Development & Design & Engineering Technology Description The Current Power device is a slow speed vertical axis turbine that utilizes a direct drive permanent magnet rotating generator The concept is based on a vertical axle turbine directly coupled to a permanent magnet synchronous generator The system is intended to be placed on the bottom of the ocean or a river where it would be protected from storm surges and strong waves The output from the generator has to be rectified and inverted before connection to the grid Robustness is achived by the simple mechanical construction
A Survey of Ocean Simulation and Rendering Techniques in Computer Graphics
This paper presents a survey of ocean simulation and rendering methods in computer graphics. To model and animate the ocean's surface, these methods mainly rely on two main approaches: on the one hand, those which approximate ocean dynamics with parametric, spectral or hybrid models and use empirical laws from oceanographic research. We will see that this type of methods essentially allows the simulation of ocean scenes in the deep water domain, without breaking waves. On the other hand, physically-based methods use Navier-Stokes Equations (NSE) to represent breaking waves and more generally ocean surface near the shore. We also describe ocean rendering methods in computer graphics, with a special interest in the simulation of phenomena such as foam and spray, and light's interaction with the ocean surface.
Darles, Emmanuelle; Ghazanfarpour, Djamchid; Gonzato, Jean-Christophe; 10.1111/j.1467-8659.2010.01828.x
Direct Drive Wave Energy Buoy
The most prudent path to a full-scale design, build and deployment of a wave energy conversion (WEC) system involves establishment of validated numerical models using physical experiments in a methodical scaling program. This Project provides essential additional rounds of wave tank testing at 1:33 scale and ocean/bay testing at a 1:7 scale, necessary to validate numerical modeling that is essential to a utility-scale WEC design and associated certification.
Rhinefrank, Kenneth E. [Columbia Power Technologies, Inc.; Lenee-Bluhm, Pukha [Columbia Power Technologies, Inc.; Prudell, Joseph H. [Columbia Power Technologies, Inc.; Schacher, Alphonse A. [Columbia Power Technologies, Inc.; Hammagren, Erik J. [Columbia Power Technologies, Inc.; Zhang, Zhe [Columbia Power Technologies, Inc.
Ocean thermal energy conversion power system development: I. Preliminary design report. Phase I. Volume 5. Appendixes H, I, J, and K. Final report
The conceptual design of a 40 to 50 MW closed cycle ammonia OTEC commercial plant, the preliminary design of a 10 MW OTEC module analogous to the 50 MW module, and the preliminary design of heat exchanger test articles (evaporator and condenser) representative of the 50 MW heat exchangers for testing in OTEC-1 are presented. This volume of the report includes the following appendices: H) conceptual design description of the electrical systems; I) control and instrumentation; J) OTEC power module assembly; and K) cost estimates for each of the cost components. (WHK)
Ocean Thermal Energy Conversion (OTEC) power system development: utilizing advanced high performance heat transfer techniques. Final technical progress report, August 1-December 11, 1978
The objectives of the program are: (1) development of a preliminary design for the full-sized power system module to be used in the 100 MWe OTEC Demonstration Plant by 1984 to demonstrate operational performance and to project economic viability; (2) preliminary design for a proof-of-concept 5 MWe (nominal pilot plant, (Test Article); (3) preliminary design for proof-of-concept 1 MWe scaled heat exchangers (Test Articles); and (4) preparation of a Phase II hardware and support plan (proposal) for the scaled test articles. Status of the program is described. (WHK)
EA-1890: Reedsport PB150 Deployment and Ocean Test Project, Oregon |
0: Reedsport PB150 Deployment and Ocean Test Project, Oregon 0: Reedsport PB150 Deployment and Ocean Test Project, Oregon EA-1890: Reedsport PB150 Deployment and Ocean Test Project, Oregon Overview The U.S. Department of Energy has selected Ocean Power Technologies (OPT) for approximately $2.4 million in financial assistance and proposes to authorize the expenditure of federal funding to OPT for the construction, deployment, and ocean testing of a single, full scale 150kW PB150 PowerBuoy. Public Comment Opportunities No public comment opportunities available at this time. Documents Available for Download August 24, 2011 EA-1890: Finding of No Significant Impact Reedsport PB150 Deployment and Ocean Test Project, Oregon August 24, 2011 EA-1890: DOE Notice of Availability of the Finding of No Significant Impact Ocean Power Technologies, Inc. (OPT), Reedsport PB150 Deployment and Ocean
Ocean | Data.gov
Ocean Ocean Ocean Data Tools Technical Guide Map Gallery Regional Planning Feedback Ocean Welcome to our COMMUNITY This is the National Ocean Council's portal for data, information, and decision tools to support people engaged in regional marine planning for the future use of the ocean, our coasts, and the Great Lakes. Our goal is to enhance discovery of and access to data and information for planners, stakeholders, and the public. Please visit our Feedback page to tell us what would make the site most useful to you as we expand our content. Start Here! Previous Pause Next PacIOOS - Pacific Islands Voyager PacIOOS - Pacific Islands Voyager View More West Coast Governors Alliance - Regional Data Framework West Coast Governors Alliance - Regional Data Framework View More Mid-Atlantic Ocean Data Portal
Energy Basics: Dish/Engine Systems for Concentrating Solar Power
Power Technologies Energy Data Book: Fourth Edition, Chapter...
Small Hydro, Tidal Energy, Wave Energy, Ocean Thermal None Purchased by utility at spot- market energy rate Yes Investor- owned utilities only Delaware 25 kW Commercial,...
AWS Ocean Energy Ltd | Open Energy Information
AWS Ocean Energy Ltd AWS Ocean Energy Ltd Jump to: navigation, search Name AWS Ocean Energy Ltd Place Inverness, Scotland, United Kingdom Zip IV17 1SN Product Inverness-based company established to commercialise the Archimedes Wave Swing. Coordinates 48.55324°, -110.689764° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":48.55324,"lon":-110.689764,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}
ocean energy | OpenEI Community
ocean energy ocean energy Home Kch's picture Submitted by Kch(24) Member 9 April, 2013 - 13:30 MHK Cost Breakdown Structure Draft CBS current energy GMREC LCOE levelized cost of energy marine energy MHK ocean energy The generalized Cost Breakdown Structure (CBS) for marine and hydrokinetic (MHK) projects is a hierarchical structure designed to facilitate the collection and organization of lifecycle costs of any type of MHK project, including wave energy converters and current energy convertners. At a high level, the categories in the CBS will be applicable to all projects; at a detailed level, however, the CBS includes many cost categories that will pertain to one project but not others. It is expected that many of the detailed levels of the CBS will be populated with "NA" or left blank.Upload
wave | OpenEI
9 9 Varnish cache server Browse Upload data GDR 429 Throttled (bot load) Error 429 Throttled (bot load) Throttled (bot load) Guru Meditation: XID: 2142281559 Varnish cache server wave Dataset Summary Description This project estimates the naturally available and technically recoverable U.S. wave energy resources, using a 51-month Wavewatch III hindcast database developed especially for this study by National Oceanographic and Atmospheric Administration's (NOAA's) National Centers for Environmental Prediction. For total resource estimation, wave power density in terms of kilowatts per meter is aggregated across a unit diameter circle. Source Electric Power Research Institute (EPRI) Date Released December 05th, 2011 (3 years ago) Date Updated Unknown Keywords
oceans - Geodata icon | Data.gov
oceans - Geodata icon Ocean Data Tools Technical Guide Map Gallery Regional Planning Feedback Ocean You are here Data.gov Communities Ocean...
Ocean Thermal Energy Conversion (OTEC) Draft Programmaticof ocean thermal energy conversion technology. U.S. Depart~on Ocean TherUial Energy Conversion, June 18, 1979. Ocean
Sands, M.Dale
Scripps Institution of Oceanography: Probing the Oceans
SanDiego,California921 Leucadia CA 92024 Other books by Elizabeth N. Shor: Fossils and Flies. Watching Waves in Land and Sea: The Institute of Geophysics and Planetary Physics ....... 149 8- bles the sound waves, and churns the stomach. But its power and its mystery hold some people in a spell
Constable, Steve
Thermal Energy Conversion (OTEC) Program PreoperationalOcean Thermal Energy Conversion (OTEC), U.S. Department ofOregon State University. Conversion Power Plants. Corvallis,
Sullivan, S.M.
2.019 Design of Ocean Systems, Fall 2005
This course is the completion of the cycle of designing, implementing and testing an ocean system, including hardware and software implementation, that begins with 2.017J. Design lectures are given in hydrodynamics, power ...
Chryssostomidis, Chryssostomos
Ocean energy contract list, fiscal year 1990
The purpose of the federal Ocean Energy Technology (OET) Program is to develop techniques that harness ocean energy (waves, currents, and thermal and salinity gradients) in a cost-effective and environmentally acceptable manner. The OET Program seeks to develop ocean energy technology to a point at which the commercial sector can assess whether applications of the technology are viable energy conversion alternatives or supplements to systems. The federal OET Program is conducted by DOE and is assigned to the Assistant Secretary for Conservation and Renewable Energy. Past studies conducted by the US Department of Energy (DOE) have identified ocean thermal energy conversion (OTEC) as the largest potential contributor to US energy supplies from the ocean resource. As a result, of the OET Program concentrates on research to advance OTEC technology. The FY 1990 contract overview comprises a list of all subcontracts begun, ongoing, or completed during FY 1990 (October 1, 1989, through September 30, 1990). Under each managing laboratory, projects are listed alphabetically by project area and then by subcontractor name.
Oceanic Heat Flux Calculation
The authors review the procedure for the direct calculation of oceanic heat flux from hydrographic measurements and set out the full "recipe" that is required.
Sheldon Bacon; Nick Fofonoff
Resources Although the potential for ocean energy technologies is believed to be very large, no comprehensive studies have been conducted to date to determine an accurate resource...
Green Power Purchase Plan (Connecticut) | Open Energy Information
Name Green Power Purchase Plan Incentive Type Green Power Purchasing Applicable Sector State Government Eligible Technologies Biomass, Fuel Cells, Landfill Gas, Ocean Thermal,...
Electrically Active Convection in Tropical Easterly Waves and Implications for Tropical Cyclogenesis in the Atlantic and East Pacific
In this study, the authors investigated the characteristics of tropical easterly wave convection and the possible implications of convective structure on tropical cyclogenesis and intensification over the Atlantic Ocean and the east Pacific Ocean. ...
Kenneth D. Leppert II; Walter A. Petersen; Daniel J. Cecil
Constraining oceanic dust deposition using surface ocean dissolved Al
Iron, manganese and lead at Hawaii Ocean Time-series stationof beryllium to the oceans, Earth Planet. Sci. Lett. , 114,organic carbon fluxes in the ocean based on the quantitative
Han, Qin; Moore, J. Keith; Zender, Charles; Measures, Chris; Hydes, David
Higher Fourier Harmonics of the Directional Distribution of an Equilibrium Wave Field under Steady Wind Forcing
Recently, directional wave spectra have been obtained by applying the two-dimensional fast Fourier transform (2D FFT) to the three-dimensional spatial topography of ocean surface waves collected by an airborne scanning laser ranging system during ...
Multiscale Momentum Flux and Diffusion due to Whitecapping in Wave–Current Interactions
Whitecapping affects the Reynolds stresses near the ocean surface. A model for the conservative dynamics of waves and currents is modified to include the averaged effect of multiple, short-lived, and random wave-breaking events on large ...
Juan M. Restrepo; Jorge M. Ramírez; James C. McWilliams; Michael Banner
Effects of Numerics on the Physics in a Third-Generation Wind-Wave Model
Numerical errors in third-generation ocean wave models can result in a misinterpretation of the physics in the model. Using idealized situations, it is shown that numerical errors significantly influence the initial growth, the response of wave ...
Hendrik L. Tolman
The Structure and Maintenance of Stationary Waves in the Winter Northern Hemisphere
Previous studies of extratropical stationary waves in the winter Northern Hemisphere (NH) often focused on effects of orography and land–ocean thermal contrast on the formation, structure, and maintenance of these waves. In contrast, research ...
Tsing-Chang Chen
Scattering of Continental Shelf Waves at a Discontinuity in Shelf Width
An analytical solution is presented for the scattering of a free shelf wave incident upon a discontinuity in shelf width in a barotropic ocean. The discussion of solutions relying on backscattered free-waves with large wavenumbers which may not ...
John L. Wilkin; David C. Chapman
Wind Forced Internal Waves in the North Pacific and Sargasso Sea
The three-dimensional structure of the near-inertial frequency internal wave field was measured at two open ocean sites using expendable velocity profilers. Both wave fields appear to be dominantly wind forced although their vertical structure ...
Modeling wind forcing in phase resolving simulation of nonlinear wind waves
Wind waves in the ocean are a product of complex interaction of turbulent air flow with gravity driven water surface. The coupling is strong and the waves are non-stationary, irregular and highly nonlinear, which restricts ...
Kalmikov, Alexander G
Experimental investigation of small-scale breaking waves : flow visualization across the air-water interface
The dynamics of breaking waves significantly affect air-sea fluxes of heat, momentum, mass and energy across the ocean interface. Breaking waves also contribute considerable loading to offshore and coastal structures, and ...
McDonald, Angus Kai
Experimental Study on Wind-Wave Momentum Flux in Strongly Forced Conditions
A quantitative description of wind-wave momentum transfer in high wind conditions is necessary for accurate wave models, storm and hurricane forecasting, and models that require atmosphere–ocean coupling such as circulation and mixed layer models. ...
Ivan B. Savelyev; Brian K. Haus; Mark A. Donelan
Trends of Atlantic Wave Extremes as Simulated in a 40-Yr Wave Hindcast Using Kinematically Reanalyzed Wind Fields
In this study, seasonal extremes of wave height in the North Atlantic are analyzed. The analysis is based on a 40-yr (1958–97) numerical wave hindcast using an intensive kinematic reanalysis of wind fields. Changes in the ocean wave extremes are ...
The Coastal Ocean Prediction Systems program: Understanding and managing our coastal ocean. Volume 1: Strategic summary
The proposed COPS (Coastal Ocean Prediction Systems) program is concerned with combining numerical models with observations (through data assimilation) to improve our predictive knowledge of the coastal ocean. It is oriented toward applied research and development and depends upon the continued pursuit of basic research in programs like COOP (Coastal Ocean Processes); i.e., to a significant degree it is involved with ``technology transfer`` from basic knowledge to operational and management applications. This predictive knowledge is intended to address a variety of societal problems: (1) ship routing, (2) trajectories for search and rescue operations, (3) oil spill trajectory simulations, (4) pollution assessments, (5) fisheries management guidance, (6) simulation of the coastal ocean`s response to climate variability, (7) calculation of sediment transport, (8) calculation of forces on structures, and so forth. The initial concern is with physical models and observations in order to provide a capability for the estimation of physical forces and transports in the coastal ocean. For all these applications, there are common needs for physical field estimates: waves, tides, currents, temperature, and salinity, including mixed layers, thermoclines, fronts, jets, etc. However, the intent is to work with biologists, chemists, and geologists in developing integrated multidisciplinary prediction systems as it becomes feasible to do so. From another perspective, by combining observations with models through data assimilation, a modern approach to monitoring is provided through whole-field estimation.
MHK Projects/US Navy Wave Energy Technology WET Program at Marine...
of Devices Deployed 6 Number of Build Out Units Deployed 7 Main Overseeing Organization Ocean Power Technologies Project Technology *MHK TechnologiesPowerBuoy Project Timeline and...
The Daytona Beach Wave of 3–4 July 1992: A Shallow-Water Gravity Wave Forced by a Propagating Squall Line
An unexpected run-up of the ocean along Daytona Beach, Florida, on 3–4 July 1992 was associated with at least one large ocean wave. The wave, which reached a height of about 3 m above normal tide, injured 75 people and damaged property along ...
Dean D. Churchill; Sam H. Houston; Nicholas A. Bond
Ocean Health and Human Health
et al. 2002. Indicators of ocean health and human health:Nature 423:280–283. Oceans and Human Health Act. 2003. S.Editorial Guest Editorial Ocean Health and Human Health
Principle Power Inc | Open Energy Information
Principle Power Inc Principle Power Inc Address 93 S. Jackson Street Place Seattle, Washington Zip 98104 Sector Wind energy Product Developing a method so wind turbines can float on ocean waves in deeper coastal waters Website http://www.principlepowerinc.c Coordinates 47.5992095°, -122.3343564° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":47.5992095,"lon":-122.3343564,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}
Ocean General Circulation Models
1. Definition of Subject The purpose of this text is to provide an introduction to aspects of oceanic general circulation models (OGCMs), an important component of Climate System or Earth System Model (ESM). The role of the ocean in ESMs is described in Chapter XX (EDITOR: PLEASE FIND THE COUPLED CLIMATE or EARTH SYSTEM MODELING CHAPTERS). The emerging need for understanding the Earth's climate system and especially projecting its future evolution has encouraged scientists to explore the dynamical, physical, and biogeochemical processes in the ocean. Understanding the role of these processes in the climate system is an interesting and challenging scientific subject. For example, a research question how much extra heat or CO2 generated by anthropogenic activities can be stored in the deep ocean is not only scientifically interesting but also important in projecting future climate of the earth. Thus, OGCMs have been developed and applied to investigate the various oceanic processes and their role in the climate system.
Yoon, Jin-Ho; Ma, Po-Lun
Ocean Thermal | Open Energy Information
Community Login | Sign Up Search Page Edit History Facebook icon Twitter icon Ocean Thermal Jump to: navigation, search TODO: Add description List of Ocean Thermal Incentives...
Spaceborne Radar Sensing of Precipitation above an Ocean Surface: Polarization Contrast Study
This feasibility study explores the potential benefits of polarization adjustment for spaceborne radar sensing of precipitation. More specifically, the role of the wave polarization in separating or "distinguishing" ocean surface return from the ...
Alexander B. Kostinski; John M. Kwiatkowski; A. R. Jameson
Analysis of Short Space–Time-Scale Variability of Oceanic Rain Using TOPEX/Jason
Information on the spatial and temporal variability of rain rate is important not only for meteorology and hydrology but also for the design of remote sensing and in situ measuring or of millimeter wave communication systems. The Ocean Topography ...
J. Tournadre; S. Bhandari
The Impact of Horizontal Resolution on the Tropical Heat Budget in an Atlantic Ocean Model
An ocean general circulation model (OGCM) of the tropical Atlantic is coupled to an advective atmospheric boundary layer model. This configuration is used to investigate the hypothesis that resolving tropical instability waves (TIWs) in OGCMs ...
Markus Jochum; Raghu Murtugudde; Raffaele Ferrari; Paola Malanotte-Rizzoli
Operational Altimeter-Derived Oceanographic Information: The NORDA GEOSAT Ocean Applications Program
The U.S. Navy's GEOSAT active microwave altimeter provides detailed oceanographic and atmospheric information. It measures global oceanic wind speeds and significant wave height, sea ice edge in the polar regions, and dynamic topography related ...
Matthew Lybanon; Conrad H. Johnson; Pavel Pistek; Richard L. Crout
Energy Basics: Wind Power Animation (Text Version)
European Geosciences Union Ocean Science Formulation of an ocean model for global climate simulations
Abstract. This paper summarizes the formulation of the ocean component to the Geophysical Fluid Dynamics Laboratory's (GFDL) climate model used for the 4th IPCC Assessment (AR4) of global climate change. In particular, it reviews the numerical schemes and physical parameterizations that make up an ocean climate model and how these schemes are pieced together for use in a state-of-the-art climate model. Features of the model described here include the following: (1) tripolar grid to resolve the Arctic Ocean without polar filtering, (2) partial bottom step representation of topography to better represent topographically influenced advective and wave processes, (3) more accurate equation of state, (4) three-dimensional flux limited tracer advection to reduce overshoots and undershoots, (5) incorporation of regional climatological variability in shortwave penetration,
B. L. Samuels; M. J. Spelman; M. Winton; R. Zhang
Positional Analysis of Wave Power.
?? The energy transition has started. The key is to find an alternative to uneconomical and unsustainable energy production. In this sense it is a… (more)
Garcia Teran, Jessica
Microbial metabolism in the deep ocean
carbon flux through the ocean's twilight zone. Science 316:sinking particle flux in the ocean's twilight zone. LimnolRespiration in the dark ocean. Geophys Res Lett 30:doi:
Hansman, Roberta Lynn
Microbial Metabollism in the Deep Ocean
Hansman, Roberta L
Constraining oceanic dust deposition using surface ocean dissolved Al Qin Han,1 J. Keith Moore,1; accepted 7 December 2007; published 12 April 2008. [1] We use measurements of ocean surface dissolved Al (DEAD) model to constrain dust deposition to the oceans. Our Al database contains all available
Moore, Keith
Real-Time Quality Control of Wave Observations in the North Sea
The use of ocean wave data in new data assimilation techniques prompted the development of a real-time quality control system for wave height and wave period observations. Over the North Sea, a relatively large number of wave observations, as ...
María Paula Etala; Gerrit Burgers
Internal Wave Reflection and Scatter from Sloping Rough Topography
Internal gravity waves propagating in a uniformly stratified ocean are scattered on reflection from a rough inclined boundary. The boundary is inclined at angle ? to the horizontal and the roughness is represented by superimposed sinusoidal ...
S. A. Thorpe
A Model for Vortex-Trapped Internal Waves
Regions of negative vorticity are observed to trap and amplify near-inertial internal waves, which are sources of turbulent mixing 10–100 times higher than typically found in the stratified ocean interior. Because these regions are of finite ...
Eric Kunze; Emmanuel Boss
Equatorial Atmospheric Waves and Their Association to Convection
Equatorial wave systems and their relationships with convective activity are analyzed in the western and central Pacific regions during the Coupled Ocean–Atmosphere Response Experiment (COARE) intensive observation periods. The study uses ...
P. Pires; J-L. Redelsperger; J-P. Lafore
The Dynamics of Mountain-Wave-Induced Rotors
The development of rotor flow associated with mountain lee waves is investigated through a series of high-resolution simulations with the nonhydrostatic Coupled Ocean–Atmospheric Mesoscale Prediction System (COAMPS) model using free-slip and no-...
James D. Doyle; Dale R. Durran
Breaking Probability for Dominant Waves on the Sea Surface
The breaking probability is investigated for the dominant surface waves observed in three geographically diverse natural bodies of water: Lake Washington, the Black Sea, and the Southern Ocean. The breaking probability is taken as the average ...
Michael L. Banner; Alexander V. Babanin; Ian R. Young
Horizontal and Vertical Structure of Cross-Equatorial Wave Propagation
Observational evidence of interhemispheric wave propagation through the equatorial upper-tropospheric mean westerlies in the eastern Pacific Ocean is found in nine years (1980/81 to 1988/89) of European Centre for Medium-Range Weather Forecasts ...
Robert A. Tomas; Peter J. Webster
Signal Sampling Impacts on HF Radar Wave Measurement
Averaging is required for the measurement of ocean surface wave spectra and parameters with any measurement system in order to reduce the variance in the estimates. Sampling theory for buoy measurements is well known. The same theory can be ...
Lucy R. Wyatt; J. Jim Green; Andrew Middleditch
The Antarctic Circumpolar Wave: A Combination of Two Signals?
A simplified view of the possible mechanisms behind the Antarctic Circumpolar Wave (ACW) interannual variability is provided by a frequency-domain decomposition of several observed atmospheric and oceanic variables. Two significant interannual ...
Silvia A. Venegas
Impact of Gravity Waves on Marine Stratocumulus Variability
The impact of gravity waves on marine stratocumulus is investigated using a large-eddy simulation model initialized with sounding profiles composited from the Variability of American Monsoon Systems (VAMOS) Ocean–Cloud–Atmosphere–Land Study ...
Qingfang Jiang; Shouping Wang
Professional paper A chronology of freaque wave encounters
of wave energy through time and space, through areas of variable surface ocean currents, and through the southern tip of Trinidad to the Gulf of Paria when Columbus heard a fearsome roaring from behind his
Long-Term Observations of Tropical Instability Waves
Reynolds sea surface temperature (SST) data showing tropical instability waves (TIWs) in the tropical Pacific are analyzed along with current measurements from the Tropical Atmosphere–Ocean (TAO) buoy array and wind speeds from the European ...
Robert F. Contreras
Diagnosing Heat and Vorticity Budgets of Annual Coupled Rossby Waves
Annual coupled Rossby waves are generated at the west coast of Australia and propagate westward across the eastern Indian Ocean from 10° to 30°S in covarying sea level height (SLH), sea surface temperature (SST), and meridional surface wind (MSW) ...
Warren B. White; Jeffrey L. Annis
Wave-induced Roll Motion beneath an Ice Cover
A pair of gravity waves propagating at oblique angles along the sea-ice interface in a viscous, rotating ocean is studied theoretically. The motion is described by a Lagrangian formulation. Two theoretical models of the ice cover are considered. ...
Arne Melsom
Lee-Wave Resonances over Double Bell-Shaped Obstacles
Lee-wave resonance over double bell-shaped obstacles is investigated through a series of idealized high-resolution numerical simulations with the nonhydrostatic Coupled Ocean–Atmosphere Mesoscale Prediction System (COAMPS) model using a free-slip ...
Vanda Grubiši?; Ivana Stiperski
Trapped Lee Wave Interference in the Presence of Surface Friction
Trapped lee wave interference over double bell-shaped obstacles in the presence of surface friction is examined. Idealized high-resolution numerical experiments with the nonhydrostatic Coupled Ocean–Atmosphere Mesoscale Prediction System (COAMPS) ...
Ivana Stiperski; Vanda Grubiši?
MHK Technologies/Ocean Treader floating | Open Energy Information
Treader floating Treader floating < MHK Technologies Jump to: navigation, search << Return to the MHK database homepage Ocean Treader floating.jpg Technology Profile Primary Organization Green Ocean Energy Ltd Project(s) where this technology is utilized *MHK Projects/Development of Ocean Treader Technology Resource Click here Wave Technology Type Click here Attenuator Technology Readiness Level Click here TRL 4: Proof of Concept Technology Description The Ocean Treader is comprised of two sponsons at the fore and aft of the device and a spar buoy in the center. As a wave passes along the device, first the fore sponson lifts and falls, then the spar buoy, and then the aft sponson, respectively. The relative motion between these three floating bodies is harvested by hydraulic cylinders mounted between the tops of the arms and the spar buoy. The cylinders pressurize hydraulic fluid that spins hydraulic motors and an electric generator. The electricity is exported via a cable piggy-backed to the anchor cable. Ocean Treader is designed to passively weather-vane to face the wave direction; and in addition, the device has active onboard adjustment to allow for offset due to the effects of current.
The purpose of these lectures is to present elements of the equations and algorithms used in numerical models of the large-scale ocean circulation. Such models generally integrate the ocean's primitive equations, which are based on Newton's Laws applied to a continuum fluid under hydrostatic balance in a spherical geometry, along with linear irreversible thermodynamics and subgrid scale (SGS) parameterizations. During formulations of both the kinematics and dynamics, we highlight issues related to the use of a generalized vertical coordinate. The vertical coordinate is arguably the most critical element determining how a model is designed and applications to which a model is of use.
Stephen M. Griffies
Ocean bottom seisometer
An improved ocean bottom seismometer is described comprising: a spherical-shaped main housing having a seismic acquisition portion and a ballast portion below the acquisition portion. The ballast portion controls the ascent and descent of the ocean bottom seismometer; a conical skirt fixed to the main housing elevating the main housing above a horizontal plane coincident with a base of the skirt. The skirt is capable of confining fluid under the main housing when the base rests on an ocean bottom; spherical compartments mounted inside the skirt; and a lifting hook mounted on the outside of the main housing.
Neeley, W.P.
Coherence of Western Boundary Pressure at the RAPID WAVE Array: Boundary Wave Adjustments or Deep Western Boundary Current Advection?
This study investigates the coherence between ocean bottom pressure signals at the Rapid Climate Change programme (RAPID) West Atlantic Variability Experiment (WAVE) array on the western North Atlantic continental slope, including the Woods Hole ...
Shane Elipot; Chris Hughes; Sofia Olhede; John Toole
MHK Technologies/Ocean | Open Energy Information
Ocean Ocean < MHK Technologies Jump to: navigation, search << Return to the MHK database homepage Ocean.jpg Technology Profile Primary Organization Hydro Green Energy LLC Project(s) where this technology is utilized *MHK Projects/Alaska 35 *MHK Projects/Maine 1 Project *MHK Projects/Mississippi 6 *MHK Projects/Mississippi 7 *MHK Projects/New York 1 *MHK Projects/New York 2 Technology Resource Click here Current/Tidal Technology Type Click here Cross Flow Turbine Technology Readiness Level Click here TRL 4: Proof of Concept Technology Description Hydro Green Energy's HydroKinetic Turbine Arrays operate differently than a traditional hydropower plant. Like a traditional hydropower station, the electricity that we produce is clean and renewable, however, there are significant differences. Hydro Green Energy's Krouse Turbines are kinetic turbines. This means that the renewable power that is generated comes from the energy in the "motion" of the moving water, i.e. the velocity of the moving water be it river, tidal or ocean current to generate river, tidal energy or ocean energy, respectively.
Carbon in Atlantic Ocean
in Atlantic Ocean About CARINA NDP-091: CARINA Data Synthesis Project The CARINA Group CARINA Cruise Summary Table and Data CARINA Data Products CARINA Database V1.2 ODV Collection...
Tropical Ocean Circulation Experiments
A primitive equation model of the equatorial Pacific Ocean was forced by realistic wind stress distributions over decades. Results were presented for a set of two experiments. In the first experiment the model was forced by an objectively ...
Mojib Latif
Nonlinear Midlatitude Ocean Adjustment
Ocean adjustment on annual to interdecadal scales to variable forcing is considered for a more nonlinear general circulation than has previously been studied. The nature of the response is a strong function of forcing frequency and importantly ...
William K. Dewar
Global Ocean Meridional Overturning
A decade-mean global ocean circulation is estimated using inverse techniques, incorporating air–sea fluxes of heat and freshwater, recent hydrographic sections, and direct current measurements. This information is used to determine mass, heat, ...
Rick Lumpkin; Kevin Speer
Modeling the Pacific Ocean
Two numerical models utilizing primitive equations (two momentum equations and a mass continuity equation) simulate the oceanography of the Pacific Ocean from 20{degrees}S to 50{degrees}N. The authors examine the abundant model data through visualization , by animating the appropriate model fields and viewing the time history of each model simulation as a color movie. The animations are used to aid understanding of ocean circulation.
Johnson, M.A.; O' Brien, J.J. (Mesoscale Air-Sea Interaction Group, Florida State Univ., Tallahassee, FL (US))
Flexible ocean upwelling pipe
In an ocean thermal energy conversion facility, a cold water riser pipe is releasably supported at its upper end by the hull of the floating facility. The pipe is substantially vertical and has its lower end far below the hull above the ocean floor. The pipe is defined essentially entirely of a material which has a modulus of elasticity substantially less than that of steel, e.g., high density polyethylene, so that the pipe is flexible and compliant to rather than resistant to applied bending moments. The position of the lower end of the pipe relative to the hull is stabilized by a weight suspended below the lower end of the pipe on a flexible line. The pipe, apart from the weight, is positively buoyant. If support of the upper end of the pipe is released, the pipe sinks to the ocean floor, but is not damaged as the length of the line between the pipe and the weight is sufficient to allow the buoyant pipe to come to a stop within the line length after the weight contacts the ocean floor, and thereafter to float submerged above the ocean floor while moored to the ocean floor by the weight. The upper end of the pipe, while supported by the hull, communicates to a sump in the hull in which the water level is maintained below the ambient water level. The sump volume is sufficient to keep the pipe full during heaving of the hull, thereby preventing collapse of the pipe.
Person, Abraham (Los Alamitos, CA)
Compton Gamma Ray Observatory/BATSE observations of energetic electrons scattered by cyclotron resonance with waves from powerful VLF transmitters. Final report, 13 October 1992-12 February 1994
To obtain a better understanding of the wave-particle mechanisms responsible for the loss of electrons from the radiation belts, energetic electron data from the Burst and Transient Source Experiment (BATSE) on the NASA's Compton Gamma Ray Observatory (GRO) was studied. Powerful ground-based VLF transmitters resonantly scatter electrons from the inner radiation belt onto trajectories from which they precipitate into the atmosphere as they drift eastward. 563 instances in which the satellite traversed a cloud of energetic electrons which had been scattered into quasi-trapped trajectories were identified. From the longitude distribution, it was concluded that waves from the VLF transmitter NWC at 114 deg E are the origin of 257 of the events, and waves from UMSat 44 deg E related to 45 more. In another 177 cases the electrons had drifted from the longitude of these transmitters to a location in the western hemisphere. The previously reported seasonal variation in the frequency of occurrence of cyclotron resonance interaction is confirmed with the continuous coverage provided by GRO. The frequency of occurrence of the cyclotron resonance interactions is largest before sunrise, which the authors attribute to the diurnal variations in the transmission VLF waves through the ionosphere. For the first time, unique very narrow sheets of electrons occurring in the aftermath of a large geomagnetic storm are reported.
Datlowe, D.W.; Imhof, W.L.
Self-interfering matter-wave patterns generated by a moving laser obstacle in a two-dimensional Bose-Einstein condensate inside a power trap cut off by box potential boundaries
We report the observation of highly energetic self-interfering matter-wave (SIMW) patterns generated by a moving obstacle in a two-dimensional Bose-Einstein condensate (BEC) inside a power trap cut off by hard-wall box potential boundaries. The obstacle initially excites circular dispersive waves radiating away from the center of the trap which are reflected from hard-wall box boundaries at the edges of the trap. The resulting interference between outgoing waves from the center of the trap and reflected waves from the box boundaries institutes, to the best of our knowledge, unprecedented SIMW patterns. For this purpose we simulated the time-dependent Gross-Pitaevskii equation using the split-step Crank-Nicolson method and the obstacle was modelled by a moving impenetrable Gaussian potential barrier. Various trapping geometries are considered in which the dynamics of the spatial and momentum density, as well as the energy, are considered. The momentum dynamics reveal an oscillatory behavior for the condensate fraction, indicative of excitations out of and de-excitations back into the condensate state. An oscillatory pattern for the energy dynamics reveals the presence of solitons in the system. Some vortex features are also obtained.
Sakhel, Roger R. [Department of Basic Sciences, Faculty of Information Technology, Isra University, Amman 11622 (Jordan); Sakhel, Asaad R. [Department of Applied Sciences, Faculty of Engineering Technology, Al-Balqa Applied University, Amman 11134 (Jordan); Ghassib, Humam B. [Department of Physics, The University of Jordan, Amman 11942 (Jordan)
Workshop on Carbon Sequestration Science - Ocean Carbon Sequestration
Ocean Carbon Ocean Carbon Sequestration Howard Herzog MIT Energy Laboratory May 24, 2001 Ocean Carbon Sequestration Options * The direct injection of a relatively pure CO 2 stream that has been generated, for example, at a power plant or from an industrial process * The enhancement of the net oceanic uptake from the atmosphere, for example, through iron fertilization The DOE Center for Research on Ocean Carbon Sequestration (DOCS) * Established July 1999 * Centered at LBNL and LLNL * Participants S Eric Adams MIT S Jim Barry MBARI S Jim Bishop DOCS Scientific Co-director LBNL S Ken Caldeira DOCS Scientific Co-director LLNL S Sallie Chisholm MIT S Kenneth Coale Moss Landing Marine Laboratory S Russ Davis Scripps Institution of Oceanography S Paul Falkowski Rutgers S Howard Herzog MIT S Gerard Nihous Pacific International Center for High Technology Research
Influence of Mean Water Depth and a Subsurface Sandbar on the Onset and Strength of Wave Breaking
Wave breaking in the open ocean and coastal zones remains an intriguing yet incompletely understood process, with a strong observed association with wave groups. Recent numerical study of the evolution of fully nonlinear, two-dimensional deep ...
Jin-Bao Song; Michael L. Banner
DCNS, OTEC roadmap May 2013 DCNSDCNS -Ocean Energy Business Unit
: Offshore OTEC plant - 30 MW reference power plant Onshore OTEC plant - Electric : Small power range up to 4 Wind Turbines, Tidal and Waves converters · Based upon know-how, competencies and industrial Floating offshore wind turbine Tidal turbine Wave converter · Renewable 24/7 baseload electricity steady
Water Power for a Clean Energy Future (Fact Sheet), NREL (National...
facilities, developing new low-impact facilities, and using abundant marine and hydro- kinetic energy resources. EPRI research suggests that ocean wave and in-stream...
Mesoscale Coupled Ocean-Atmosphere Interaction
small-scale features in ocean winds. Science, 303, Chelton,of the regional coupled ocean-atmosphere model RCAO. Borealstress dependence on ocean surface velocity: implications
Seo, Hyodae
Mesoscale coupled ocean-atmosphere interaction
Ocean - Community Practice Block | Data.gov
Community Practice Block Ocean Data Tools Technical Guide Map Gallery Regional Planning Feedback Ocean You are here Data.gov Communities Ocean...
Mesozooplankton trophic variability in a changing ocean
trends in contemporary ocean productivity. Nature 444: 752-Gyre Oscillation links ocean climate and ecosystem change.biomass from satellite ocean colour. J. Mar. Syst. 78: 18-
Décima, Moira
Ocean Map National | Data.gov
National Ocean Data Tools Technical Guide Map Gallery Regional Planning Feedback Ocean You are here Data.gov Communities Ocean Featured Maps The following maps are from data...
Ocean Feedback Form | Data.gov
Feedback Form Ocean Data Tools Technical Guide Map Gallery Regional Planning Feedback Ocean You are here Data.gov Communities Ocean Comments or Suggestions Name * Email Topic...
The Probability Density Function of Ocean Surface Slopes and Its Effects on Radar Backscatter
Based on Longuet-Higgins's theory of the probability distribution of wave amplitude and wave period and on some observations, a new probability density function (PDF) of ocean surface slopes is derived. It is where ?x and ?y are the slope ...
Y. Liu; X-H. Yan; W. T. Liu; P. A. Hwang