Occurrence of extreme waves in three-dimensional mechanically generated wave fields propagating over an oblique current - École des Ponts ParisTech Access content directly
Journal Articles Natural Hazards and Earth System Sciences Year : 2011

Occurrence of extreme waves in three-dimensional mechanically generated wave fields propagating over an oblique current

Abstract

Laboratory experiments were performed to study the dynamics of three- dimensional mechanically generated waves propagating over an oblique current in partial opposition. The flow velocity varied along the mean wave direction of propagation with an increasing trend between the wave-maker and the centre of the tank. Tests with regular wave packets traversing the area of positive current gradient showed that the concurrent increase of wave steepness triggered modulational instability on otherwise stable wave trains and hence induced the development of very large amplitude waves. In random directional wave fields, the presence of the oblique current resulted in a weak reinforcement of wave instability with a subsequent increase of the probability of occurrence of extreme events. This seems to partially compensate the suppression of strongly non-Gaussian properties due to directional energy distribution.

Dates and versions

hal-00678545 , version 1 (13-03-2012)

Identifiers

Cite

A. Toffoli, L. Cavaleri, A. V. Babanin, Michel Benoit, E. M. Bitner-Gregersen, et al.. Occurrence of extreme waves in three-dimensional mechanically generated wave fields propagating over an oblique current. Natural Hazards and Earth System Sciences, 2011, 11, pp.895-903. ⟨10.5194/NHESS-11-895-2011⟩. ⟨hal-00678545⟩
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