深海海洋环境噪声垂直相关性研究

海洋环境噪声场是海洋中的固有声场,其空间结构特性是影响水声系统的重要因素之一。在风成海洋环境噪声波数积分模型的基础上,对深海噪声场的垂直相关性进行了研究。通过数值仿真讨论了深海环境下,海底声速、衰减系数、海面噪声源深度及接收器深度对均匀分布于海面附近的噪声源的垂直相关性的影响。仿真结果表明:噪声场的垂直相关随海底声速、衰减系数和接收器的绝对深度的变化较小;高频噪声的垂直相关性对噪声源的深度较敏感,低频噪声的垂直相关性受噪声源深度的影响几乎可以忽略。在此基础上,分析了某次海试噪声数据,并结合数值计算结果对实验测得噪声数据的垂直相关性进行了合理的解释。

Research on the vertical correlation of ambient noise in deep sea

Ambient noise is the resident acoustic field in the ocean, and the spatial property of the noise field is a dominant factor which affects the performance of the underwater system. In this paper, the vertical correlation of ambient noise in deep water is studied based on the wind-generated noise model using the wavenumber integral representation. The vertical correlation under different environment parameters, such as the sound speed and the attenuation of the seabed, and the depth of the sources and the receivers, is simulated numerically. The simulation results show that the sound speed and the attenuation of the seabed and the receiver depth have little impact on the vertical correlation; and the vertical correlation is sensitive to the source depth at high frequency, however, it is slightly influenced at low frequency. The experimental data were analyzed and the results are explained reasonably comparing with the simulations.