深海海山周围航船噪声建模与特性研究

本文以抛物方程模型为基础,结合声场的互易性,提出一种深海低频航船噪声建模方法,该方法将声源与接收点位置互换,大大降低了声场计算的运行次数和运行时间,基于该方法对深海海山周围的航船噪声进行计算和分析.研究结果表明:海山对声传播损失的影响取决于接收阵元与海山的位置关系以及海山的几何参数.由于海山的遮挡作用,海山附近航船噪声的水平指向性具有不均匀性,在有海山遮挡的方向噪声级明显低于无海山遮挡的方向,海山附近航船噪声的垂直指向性会出现多个峰值.此外,单个尖峰海山的遮挡对接收阵元处的航船噪声总级影响较小.

Numerical modeling and properties analysis for shipping noise close to a deep ocean seamount

According to the parabolic equation(PE) theory and the reciprocity of the sound field, a model of distant shipping noise in deep ocean environments is presented. Based on the approach, the properties of distant shipping noise close to a seamount are studied. The results suggest that the number of the PE calculations for the reciprocity approach is much smaller than that for the direct approach. The shipping noise level is reduced significantly when measured on receivers close to the seafloor. Furthermore, sound propagation across a seamount is reduced more or less depending on the geometrical pos-ition between the receiver and the seamount. The horizontal directivity of the shipping noise is changed significantly due to shading by the seamount. However, a single seamount has little influence on the total shipping noise level.