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- W606002015 abstract "According to the conventional wave model, the evolution of wind waves is controlled almost solely by nonlinear energy transfer in the absence of wind. To examine this hypothesis, laboratory experiments were carried out, where irregular waves generated by wind in the first half of a wind flume were kept free from wind in the second half of the flume (decay area). When wind waves have larger nonlinearity (corresponding to the square of the significant wave slope), the spectral evolution observed seems to agree roughly with nonlinear transfer computed. A closer examination, however, reveals notable discrepancies between the observed spectral evolution and nonlinear energy transfer not only in magnitude but also in pattern. In particular, positive nonlinear energy transfer is always calculated on the high-frequency side of the peak frequency, whereas the measured wave spectra never show such a growth in the corresponding frequency band even after the correction due to molecular dissipation. When nonlinearity becomes smaller, the observed spectral evolution changes only a little while nonlinear energy transfer calculated decreases rapidly approximately to the third power of nonlinearity. In consequence the former overwhelms the latter in magnitude, indicating that nonlinear energy transfer cannot be the principal agent that governs the spectral evolution in decay area for small nonlinearity. It is suggested therefore that some unknown dissipative mechanism must be invoked to explain the observed evolution of wave spectra in decay area and that the prevailing framework of wave models should be improved much more for its universal validity." @default.
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- W606002015 date "1996-01-01" @default.
- W606002015 modified "2023-09-24" @default.
- W606002015 title "AN EXPERIMENT OF WIND WAVES IN DECAY AREA IN REFERENCE TO THE ROLE OF NONLINEAR ENERGY TRANSFER" @default.
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