Experimental Study of Elementary Processes in Wind-Waves Using Wind over Regular Waves
The evolution of mechanically generated regular waves under the wind has been studied using two wind-wave tanks of different dimensions. There are four distinct stages: (1) the coexistence of local wind waves with unaffected regular waves, (2) the attenuation of wind waves and the simultaneous growth of regular waves, (3) the rapid growth of regular waves after the disappearance of wind wave peak, and (4) the transition of regular waves to wind waves accompanied by a frequency shift to longer periods. In Stage 2 the existence is suggested of some strong nonlinear interactions which effectively transfer energy from the wind to regular waves under a condition where the peak frequency of the local wind waves is close to that of the second harmonics of the regular wave. In Stage 4, the modulation of the regular wave, the amplification of the modulation with its irregularities, and the mutual coalescence of waves, seem essential.
KeywordsWave Height Elementary Process Frequency Ratio Wind Wave Regular Wave
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