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|Title:||Interpretation of nonlinearity in wind generated ocean surface waves|
|Authors:||Varkey, M J|
|Abstract:||This study attempts to resolve a mix-up between a physical process and its mathematical interpretation in the context of wind waves on ocean surface. Wind generated wave systems, are conventionally interpreted as a result of interaction of a number of sinusoidal component waves; a consequent idea arising out of Fourier analysis. It is hypothesised that a sea state which is always nonlinear to various degrees is a result of interaction, both linear and nonlinear, between nonlinear component waves of different nonlinear intensities and their groups. The intensity (nearly linear to high) and dominance of a particular component wave depend on the stage of development of sea state, wind structure and environmental conditions like currents, bottom topography and other wave systems. As the nonlinearity of a sea state becomes more and more, the sinusoidal (linear) component wave model becomes more and more unfit and the nonlinear component wave model becomes more appropriate. Earlier works with results as pointers to the hypothesis are critically examined- Four largely different deep water sea states are analysed for their bispectra and bicoherence and the results are found to support strongly the nonlinear component wave model.|
|ISSN:||0975-1033 (Online); 0379-5136 (Print)|
|Appears in Collections:||IJMS Vol.22(2) [June 1993]|
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