非线性效应对风浪波面极大值和极小值分布的影响

Effect of the Non-Linearity on the Distribution of the Maxima and Minima of Wind Wave Surface

通过分析实验室风浪观测结果研究非线性效应对波面极大值和极小值分布的影响。波面极大值和极小值累积概率的差异表明 ,与线性理论相比 ,波面极小值在平均波面以下的位置偏高。对实验结果的进一步分析表明 ,非线性效应使波面极大值在平均波面以上总概率高于线性理论结果 ,而概率密度峰值处波面极大值高度略低于线性理论结果。波面极小值在平均波面以上各位置出现的概率均高于线性理论结果 ,在平均波面以下的较低位置 ,波面极小值出现概率明显低于线性理论结果。

By observating the distributions of the maxima and the minima of wave surface in wind wave channel, the non-linear effect in the distributions is reflected in the difference of the probability of exceedence between the maxima and the minima. In comparison with the linear theory, the probability of the maxima above the mean surface is higher. However the height of the maxima with peak probability is slightly lower. Below the mean surface, the height of the minima is higher than that of the results of the linear theory. The probability of the minima above the mean surface is higher than that in the linear theory.