摘要
畸形波是一种波高极大的灾害性波浪,实测资料的缺乏限制了其研究进展。实验室实现畸形波可控制生成弥补了这一不足。该文将利用小波变换对实验室畸形波生成过程中记录的波面时间序列进行时频分析,研究畸形波生成时的小波谱分布特征,对比畸形波生成前后能量分布和频率组成的区别,得到畸形波生成过程中在时间-频率域内的分布特性和变化规律,并运用这些规律对实测资料中无法识别的畸形波生成阶段进行判别,有助于更深入的掌握这种灾害性波浪的特征。
Freak wave is a devastating wave with extraordinarily large wave height. The scarcity of actual field measurements hinders the substantial study on freak waves. Generation of freak waves in laboratory solved this problem. This paper studies the time-frequency characteristics of generating process of freak waves based on wavelet transform. The wavelet spectrum characteristics of the freak waves at the moment of the wave generating, are studied. From the wavelet spectrum, the energy construction and frequency component prior and after the freak waves generated are compared. So that the time-frequency characteristics of freak waves generating process can be ascertained. Meanwhile based on the results, the uncertain stage of recorded sea freak waves generating process can be investigated, which may help us learn the real feature of this hazard wave.
出处
《水动力学研究与进展（A辑）》
CSCD
北大核心
2009年第6期754-760,共7页
Chinese Journal of Hydrodynamics
基金
教育部重点基金(104061)
中国博士后科学基金(20080441115)资助项目
关键词
畸形波
物理生成
演化过程
小波变换:时频分析
freak wave
physical generation
evolutionary process
wavelet transform
time-frequency analysis
