基于小波相干的波流相关性分析

Correlation analysis of wave and current based on wavelet coherence

本文基于交叉谱和小波相干对不同水深时的波流相关性进行分析。首先对实验室波流信号进行凝聚谱估计,结果显示,在谱峰附近,波流呈现统计意义上的显著相关性,不同水深时的相关性强弱有所区别,中层水深的波流相关性最强。其次采用小波相干估计波流相关性,结果显示,在频率约为0.67~2.70 Hz时波流相关性较强,位于中层水深时,波流呈现强相关性的时间段最长,在浅层和深层水深时,波流呈现强相关性的时间段较短。

This paper analyzes the correlation of wave and current at different depths based on cross-spectrum and wavelet coherence.Firstly,we estimate magnitude-squared coherence on the laboratory wave and current signals.The results show that the wave and current present a statistically significant correlation near the spectrum peak.The correlation at different water depths is different,and the wave and current correlation is the strongest at the middle depth.Secondly,we estimate wavelet coherence on the laboratory wave and current signals.The results show that the wave and current have strong correlation among 0.67~2.70 Hz.The wave and current have the longest period of strong correlation at the middle depth.In the shallow and deep depths,the period of strong correlation is shorter.