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Nonlinear wave focusing on water of finite depth. (English) Zbl 1047.76010

Summary: The problem of freak wave formation on water of finite depth is discussed. Dispersive focusing in a nonlinear medium is suggested as a possible mechanism of giant wave generation. This effect is considered within the framework of nonlinear Schrödinger equation and Davey-Stewartson system describing \(2+1\)-dimensional surface wave groups on water of finite depth. In the \(2+1\)-dimensional case, the dispersive grouping is accompanied with a geometrical focusing. Necessary wave conditions for the occurrence of such a phenomenon are discussed. Influence of non-optimal phase modulation and presence of strong random wave component are found to be weak: they do not cancel the mechanism of wave amplification. The mechanism of dispersive focusing is compared with the wave enhancement due to Benjamin-Feir instability, which is found to be extremely sensitive with respect to weak random perturbations.

MSC:

76B15 Water waves, gravity waves; dispersion and scattering, nonlinear interaction
76E99 Hydrodynamic stability
35Q55 NLS equations (nonlinear Schrödinger equations)
35Q53 KdV equations (Korteweg-de Vries equations)
Full Text: DOI

References:

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