由模拟波面分析双峰谱型海浪的统计特征

采用目前国际上最新的随机波分析方法,由协方差矩阵的循环嵌套技术,对美国国家浮标44008站2002年6月一典型的双峰海浪谱资料进行谱分析.以实测平均谱为靶谱,对随机波面进行模拟.得到模拟波面估计谱与实测谱极为相近,谱峰及谱峰频率都基本一致.说明利用模拟波面研究海浪具有代表性,它可以反映实测海浪的特征.利用实测海浪谱密度,统计波特征量的周期概率分布,得到理论周期概率密度与估计周期概率密度分布相符较好,且与模拟波面的波周期分布也较好的一致.利用Longuet-Higgins(1983)模型计算了波高-周期联合概率密度分布.得到变换高斯过程计算的波高与周期联合分布与实测情况基本相同,更好地描述了波高-周期联合概率密度分布.

An analysis on the statistical characteristic of sea waves with double-peaked spectrum

A typical double-peaked wave spectrum data,collected at the A merican National Data Buoy 44008 from June,2002.Using WAFO (Wave A nalysis for Fatigue and Oceanog raphy) method,it represents the latest developments.Taking the measured spectrum as the target spectrum,fast and exact simulate stationary Gaussian process through circulate embedding of the Covariance matrix.We find the estimate spectrum is very closing the measured spectrum,and peak frequency almost same.It is a feasible method based on simulated wave surface,which can reflect the wave charact eristics.Using observed wave spectrum data,we analyze sea wave characteristics.We can sea that the theoretical density and the estimated density are in good agreement with the original spectrum.Using Longuet-Higgins(1983) model,we calculate joint pdf of crest height and crest period.We conclude that joint probability density function of crest height and crest period calculated on the transform Gaussian sea is very closing the joint pdf of crest height and crest period derived by the measured data.