It is experimentally shown that amplification of wind waves is caused by vortices that periodically form in the viscous layer of a wind flow and deform the leeward face of a wave. Amplification is a cycle of the growth of wave steepness up to a critical value at which the wave decays into long linear nonplane waves. A method for the calculation of deep-water wave amplification for a specified wind field is suggested. The method was verified using experimental and field data.
Faculty of Physics, Moscow State University, Moscow, 119991, Russia
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