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Indexed by:会议论文

Date of Publication:2015-06-21

Included Journals:EI、Scopus

Volume:2015-January

Page Number:494-500

Abstract:A wave-basin experiment was conducted considering broad directional spreading in different water depth. Long-time surface elevation data were recorded. Freak waves generated by different mechanisms were observed and the effects of the directionality spreading on freak wave occurrence probability were investigated. The results showed that both modulation instability and linear directional focusing can generated the freak wave in multi-directional wave train. The directionality spreading had significant effects on freak wave occurrence probability. In relatively deep water, the waves with a narrow directional spreading range (less than 11  ) and larger BFI values were unstable. The freak wave occurrence probability increased owing to the modulation instability. While, in shallow water depths or with wide directional spreading, freak waves occurrence probability decreased. This indicates that freak waves occur more easily in deep water when the wave directional spreading is narrower. Copyright ? 2015 by the International Society of Offshore and Polar Engineers (ISOPE).