Large transient waves generated through modulational instability in deep water

摘要：

The long-term evolution of nonlinear wave train in deep water with varied initial wave steepness is investigated experimentally in a super wave flume (300 m long, 5 m wide, 5.2 m deep). The initial wave train is the combination of one carrier wave and a pair of imposed sideband components. Increasing modulation of wave train is observed due to sideband instability until a critical value which either initiates wave breaking or reaches the maximum modulation. The observed maximum local wave steepness increases rapidly with the increase of the initial wave steepness, and levels off at initial wave steepness roughly equal to 0.15 despites that the data exhibits a little scattering.The normalized crest elevation at peak modulation increases rapidly with initial wave steepness and approached a maximum value almost equal to 3.5 which corresponds to initial wave steepness around 0.15 c c k a = . The results reveal that the large transient wave such as freak wave could be generated during the propagation of nonlinear wave trains in deep water through sideband instability.

关键词： sideband modulation transient wave breaking

作者: Wen-son Chiang Hweng-hwung Hwung

作者单位: Associate Research Fellow,Tainan Hydraulics Laboratory,NCKU Tainan,China Professor,Department of Hydraulic and Ocean Engineering,NCKU Tainan,China

会议类型: 国际会议

会议名称: 9th International Conference on Hydrodynamics(第九届国际水动力学会议 ICHD2010)

会议地点: 上海

会议语种:英文

页码: 114-119

在线出版日期: 2010-10-11（万方平台首次上网日期，不代表论文的发表时间）