改进的相位调制法模拟畸形波:I—理论模型与验证  

The generation of freak waves based on a modified phase modulation method:I-Theory and validation

作　　者：刘赞强[1] 张宁川[1] 俞聿修[1] 裴玉国[1] 

机构地区：[1]大连理工大学海岸和近海工程国家重点实验室,辽宁大连116024

出　　处：《水动力学研究与进展（A辑）》2010年第3期383-390,共8页Chinese Journal of Hydrodynamics

基　　金：教育部基金重点资助项目(104061)

摘　　要：基于随机波浪的Longuet-Higgins模型,提出了一个改进的相位调制方法模拟畸形波。调制部分组成波的随机初相位,使该部分组成波的波高在预定地点和预定时间为正,波浪在此叠加形成畸形波。该方法不但能够实现定时定点生成畸形波,同时既可以满足波浪序列的统计特性、又保持目标谱的结构。与现有线性叠加法比较,该方法可以模拟得到更高畸形度的畸形波。对"新年波"等3个实测波列进行模拟验证,结果表明本方法模拟畸形波具有良好的精度和较高的效率。Based on the Longuet-Higgins wave model theory,a modified phase modulation method for simulating freak waves was developed.The surface elevations of some wave components at the pre-assigned place and time are positive by modulating the corresponding random initial phases,and it enhances the total surface elevation and makes a freak wave generated.The method not only can make the freak waves occurred at the assigned time and place,but also satisfy the wave series statistics and keep agreement with the target spectrum.By comparing with the existing methods,this new numerical simulation can produce waves with much higher nonlinear freak.The comparisons of the simulated freak waves with the recorded freak waves show that this numerical approach is of good precision and high efficiency.

关 键 词：Longuet-Higgins模型 相位调制法 畸形波 

分 类 号：P731.22[天文地球—海洋科学]