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

被引：31

作者：

Toffoli, A. ^{[1
,2
]}

Cavaleri, L. ^{[3
]}

Babanin, A. V. ^{[1
]}

Benoit, M. ^{[4
]}

Bitner-Gregersen, E. M. ^{[5
]}

Monbaliu, J. ^{[2
]}

Onorato, M. ^{[6
]}

Osborne, A. R. ^{[6
]}

Stansberg, C. T. ^{[7
]}

机构：

[1] Swinburne Univ Technol, Fac Engn & Ind Sci, Hawthorn, Vic 3122, Australia

[2] Katholieke Univ Leuven, B-3001 Heverlee, Belgium

[3] Inst Marine Sci, I-30122 Venice, Italy

[4] Univ Paris Est, St Venant Lab Hydraul, Joint Res Unit EDF R&D, CETMEF,Ecole Ponts ParisTech, F-78401 Chatou, France

[5] Det Norske Veritas, N-1322 Hovik, Norway

[6] Univ Turin, Dipartimento Fis Gen, I-10125 Turin, Italy

[7] Marintek, N-7450 Trondheim, Norway

来源：

NATURAL HAZARDS AND EARTH SYSTEM SCIENCES | 2011年 / 11卷 / 03期

基金：

澳大利亚研究理事会;

关键词：

SURFACE GRAVITY-WAVES; MODULATIONAL INSTABILITY; STATISTICAL PROPERTIES; SEA; DISTRIBUTIONS; PROBABILITY; EVOLUTION; BLOCKING;

D O I：

10.5194/nhess-11-895-2011

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

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.

引用

页码：895 / 903

页数：9

共 42 条

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