Deterministic aspects of nonlinear modulation instability

Details Deterministic aspects of nonlinear modulation instability Deterministic aspects of nonlinear modulation instability

2011-10-24

arxiv.org/abs/1110.5120v1

Physics

Fluid Dynamics

12 pages, 3 figures, presented: M. Olagnon and M. Prevosto, eds. Rogue Waves 2004. Brest, France: IFREMER, 2005

Scientific paper

Different from statistical considerations on stochastic wave fields, this paper aims to contribute to the understanding of (some of) the underlying physical phenomena that may give rise to the occurrence of extreme, rogue, waves. To that end a specific deterministic wavefield is investigated that develops extreme waves from a uniform background. For this explicitly described nonlinear extension of the Benjamin-Feir instability, the soliton on finite background of the NLS equation, the global down-stream evolving distortions, the time signal of the extreme waves, and the local evolution near the extreme position are investigated. As part of the search for conditions to obtain extreme waves, we show that the extreme wave has a specific optimization property for the physical energy, and comment on the possible validity for more realistic situations.

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