Observations of triad coupling of finite depth wind waves

Abstract

Fetch limited finite depth wind waves are subjected to a bispectral analysis to determine the extent of triad nonlinear coupling. Very long yet stationary time series are utilized, enabling the determination of bicoherence values with significantly smaller confidence limits than have been achieved previously. The bispectral analysis indicates a significant degree of phase coherence between the spectral peak frequency and higher frequencies. It is concluded that this phase coherence is as a result of non-resonant or bound triad interactions with the spectral peak frequency. Previous studies of triad coupling have generally been confined to relatively shallow water. Values of the relative dept..