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<p>Non Linear Internal Waves (NLIW) are ubiquitous and appear wherever a proper combination of stratified water, current and  bathymetry occur. In recent years, they have also been proven of primary interest for acoustic oceanography, since they are known  to play an important role in sound speed fluctuations in shallow waters. The predictability of acoustic variability caused by these  waves has been somewhat limited, and largely based on direct numerical simulation. Through this project, we present a simple and  computationally efficient analytic model based on coupled mode theory. For this purpose, narrow and broadband acoustic normal  mode fluctuations in the 2001 South China Sea ASIAEX experiment are first examined. Then ASIAEX environmental data are  used to characterize the space/time scales of NLIW sound speed structure. Finally, a comparison is conducted between the  observed normal mode variability and the predictions from an analytic model utilizing the observed NLIW structure, such as its  width, amplitude and speed. As the model proves to be very sensitive to these characteristics, an overview of the Synthetic  Aperture Radar capabilities to retrieve them is also conducted. In this latter part of the project, particular attention is given to wind  effects on SAR data.
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<br>Subjects: Underwater acoustics; Mathematical models; Nonlinear systems</div>
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Simon, Alban</div>
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