南海某海域海洋环境噪声谱级风关特性分析

为探索南海某区域海洋环境噪声谱级与风场的相关特性,结合潜标海洋环境噪声数据及对应海域的海面风场再分析数据,计算各频段噪声级与风速相关系数及线性拟合函数。分析结果表明:400～1 000 Hz频段,海洋环境噪声谱级与海面风速的相关系数在0.5～0.8之间,达到中等相关。1 000～5 000 Hz频段,两者互相关系数大于0.8,达到高度相关。对海洋环境噪声谱级与对数风速的回归分析结果显示,1000～5 000 Hz频段,两者的线性函数关系显著;并且在1 000 Hz附近的拟合斜率最大,海洋环境噪声谱级对海面风速变化的灵敏度最高。

Analysis of Wind-Generated Characteristics of Ocean Ambient Noise Spectrum in South China Sea

In order to analyze the correlation characteristics of ocean ambient noise spectrum and sea surface wind speed in South China Sea,the cross correlation coefficient and linear fitting function are calculated,using the ambient noise data collected by an acoustic submerged buoy and sea surface wind speed reanalysis data from National Centers for Environmental Prediction.The result shows that in the frequency band of 400~1000Hz,the cross correlation coefficient is between 0.5 and 0.8,to be of a moderate correlation.In the frequency band of 1000~5000Hz,the cross correlation coefficient is greater than 0.8,to be achieved a high degree of correlation.The linear regression analysis also demonstrates that the ocean ambient noise spectrum levels are linear functions of the log wind speed in the band from 1000 to 5000 Hz.In particular,the fitting slope around 1000Hz is found to be maximal,suggesting the maximum sensitivity of the ocean ambient noise spectrum level to the variation of sea surface wind speed.