Abstract:
We consider an extension of the kinetic equation developed by Newell and Zakharov in 2008. The new equation takes not only the resonant four-wave interactions but also the dissipation associated with the wave breaking into account. In the equation, we introduce a dissipation function that depends on the spectral energy flux. This function is determined up to a functional parameter, which should be optimally chosen based on a comparison with experiment. A kinetic equation with this dissipation function describes the usually experimentally observed transition from the Kolmogorov–Zakharov spectrum E(ω)∼ω−4 to the Phillips spectrum E(ω)∼ω−5. The version of the dissipation function expressed in terms of the energy spectrum can be used in problems of numerically modeling and predicting sea waves.
Keywords:
Phillips spectrum, kinetic (Hasselmann) equation for water waves,
Kolmogorov–Zakharov spectrum.
This research was supported by a grant from the Russian Science Foundation (Project No. 19-72-30028) with a contribution from the MIGO GROUP (http://migogroup.ru).
Citation:
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