surface is initially at rest, and the generation of the wave is initiated by turbulent wind flows and then by fluctuations of the wind, normal pressure acting on the water surface. Due to this pressure fluctuation arise normal and tangential stresses that generate wave behavior on the water surface. The assumptions of this mechanism are as follows: The water is originally at rest; The water is inviscid; The water is irrotational; The normal pressure to the water surface from the turbulent wind is randomly distributed; and Correlations between air and water motions are neglected. From "wind shear forces": In 1957, John W. Miles suggested a surface wave generation mechanism that is initiated by turbulent wind shear flows, , based on the inviscid Orr-Sommerfeld equation. He found that the energy transfer from wind to water surface as a wave speed, , is proportional to the curvature of the velocity profile of wind, , at the point where the mean wind speed is equal to the wave speed (, where is the mean turbulent wind speed). Since the wind profile, , is logarithmic to the water surface, the curvature, , has a negative sign at point . This relation shows the wind flow transferring its kinetic energy to the water surface at their interface, and thence arises wave speed, . The growth-rate can be determined by the curvature of the winds () at the steering height () for a given wind speed, . The assumptions of this mechanism are: 2-dimensional, parallel shear flow, . Incompressible, inviscid water/wind. Irrotational water. Small slope of the displacement of the surface. Generally, these wave formation mechanisms occur together on the ocean surface, giving rise to wind waves that eventually grow into fully developed waves. If one supposes a very flat sea surface (Beaufort number, 0), and sudden wind flow blows steadily across it, the physical wave generation process would be like this: Turbulent wind flows form random pressure fluctuations at the sea surface. Small waves with a few centimeters order of wavelengths are generated by the pressure fluctuations (Phillips mechanism). The cross wind keeps acting on the initially fluctuated sea surface. Then the waves become larger, and as they do so, the pressure differences increase, and the resulting shear instability expedites wave growth exponentially (Miles mechanism). The interaction among the waves on the surface generates longer waves (Hasselmann et al., 1973) and this interaction transfers energy