Abstract
Wave‐wave interaction is one of the more promising mechanisms for wind‐generated ambient noise. However, levels calculated with the linear gravity/capillary dispersion model for surface waves are found to be much too low above about 10 Hz. This discrepancy may rest in the wave model rather than the mechanism itself. Surface‐wave measurements in flumes show no evidence of dispersion at higher wavenumbers. To account for dispersionless propagation, a nonlinear model in which the surface fine structure is treated as a random ensemble of solitonlike hydraulic bumps rather than dispersive waves has been proposed. The “soliton” model appears to account for measured acoustic backscattering strengths and associated Doppler spectra at moderate sea states. Effects of the model on ambient noise prediction are examined.
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