当前位置: X-MOL 学术Coast. Eng. J. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Nonlinear wave transformations and randomness
Coastal Engineering Journal ( IF 2.4 ) Pub Date : 2019-09-27 , DOI: 10.1080/21664250.2019.1672126
S. Beji 1
Affiliation  

ABSTRACT Variations of raw spectral estimates of ocean waves with quite different sea states are examined for confirming their fitness to theoretical chi-square distribution with two degrees of freedom. A hypothetical numerical experiment is devised and histograms of spectral variability for artificially produced initial wave spectrum of constant shape undergoing nonlinear transformations are computed and compared with the chi-square distribution. As the nonlinear energy transfer among wave components develops, the histograms of spectral variability, initially constant, evolve to the exponentially decaying chi-square form. Once the variability distribution attains the exponential form it remains so regardless of the change in wave field characteristics, as for waves becoming linear by propagating into deeper regions. Irreversible nonlinear wave transformations not only redistribute the spectral energy broadly but also do it by imparting a variability to spectral components which accords with the chi-square distribution, indicating true randomness.

中文翻译:

非线性波变换和随机性

摘要 检查了具有完全不同海况的海浪原始光谱估计值的变化,以确认它们对具有两个自由度的理论卡方分布的适用性。设计了一个假设的数值实验,并计算了经过非线性变换的人工产生的恒定形状初始波谱的光谱变异性直方图,并与卡方分布进行了比较。随着波分量之间的非线性能量转移的发展,光谱可变性的直方图最初是恒定的,演变为指数衰减的卡方形式。一旦可变性分布达到指数形式,无论波场特性如何变化,它都会保持不变,因为波通过传播到更深的区域而变得线性。
更新日期:2019-09-27
down
wechat
bug