Effect of Quasi-Oscillations in the Wind-Wave Spectrum
on Its Low-Frequency Nonlinear Evolution

I. V. Lavrenov

Arctic and Antarctic Research Institute, ul. Beringa 38, St. Petersburg, 199397 Russia
E-mail: lavren@aari.nw.ru

Received January 29, 1998; in final form, July 27, 1998

Abstract—The effect of quasi-oscillations in the wind-wave spectrum on its low-frequency evolution is
assessed by numerically solving the kinetic equation that takes into account weakly nonlinear interactions in
the spectrum. It is shown that quasi-oscillations are responsible for a significant enhancement of the effect of
weakly nonlinear wave development. A parametrization that makes it possible to consider this effect in spectral
models of wind waves is proposed.

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