The Open Ocean Engineering Journal


ISSN: 1874-835X ― Volume 6, 2013

Extreme and Rogue Waves in Directional Wave Fields

The Open Ocean Engineering Journal, 2011, 4: 24-33

A. Toffoli, E. M. Bitner-Gregersen

Faculty of Engineering and Industrial Sciences, Swinburne University of Technology, P.O. Box 218, Hawthorn, 3122 Victoria, Australia.

Electronic publication date 30/3/2011
[DOI: 10.2174/1874835X01104010024]


It is well established that modulational instability enhances the probability of occurrence for rogue waves if the wave field is long crested, narrow banded and sufficiently steep. As a result, a substantial deviation from commonly used second order theory-based distributions can be expected. However the spreading of the wave energy over a number of directional components can notably reduce the effect of modulational instability. In order to achieve a better understanding on the influence of wave directionality and its implication for design work, numerical simulations based on the truncated potential Euler equations were used. Results show the existence of a transition region between strongly and weakly non-Gaussian statistics as short crestedness increases.

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