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Efim Pelinovsky
Institute of Applied Physics, Nizhny Novgorod, Russia
Rogue Waves: Facts, Theories and Modelling
Wednesday 11th October 14:05-14:55pm,
Carslaw Building Room 373.
A review of physical mechanisms of the rogue wave phenomenon is given.
The data of marine observations as well as laboratory experiments are
briefly discussed. They demonstrate that freak waves may appear in
deep and shallow waters. Simple statistical analysis of the rogue wave
probability based on the assumption of a Gaussian wave field is
reproduced. In the context of water wave theories the probabilistic
approach shows that numerical simulations of freak waves should be
made for very long times on large spatial domains and large number of
realizations. The following mechanisms of the rogue wave formation are
considered: dispersion enhancement of transient wave groups,
geometrical focusing in basins of variable depth, wave-current
interaction, nonlinear modulational instability (Benjamin\u2013Feir
instability), and wind flow action. Specific numerical simulations
were performed in the framework of various mathematical models: the
nonlinear Schrodinger equation, the Davey-Stewartson system, the
Korteweg-de Vries equation, the Kadomtsev-Petviashvili equation,
the Zakharov equation, the fully nonlinear potential equations, and
their forcing versions. The results of the numerical experiments show
the main features of the physical mechanisms of rogue wave phenomenon.
They are used to estimate the rogue wave life-time and explain the
observed data.
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