浅海海底界面混响平均强度特性仿真  

Simulations of the average reverberation intensity due to different rough bottom interfaces in shallow-water waveguide

作　　者：侯倩男[1,2,3] 吴金荣[2,3] 张建兰[2,3] 马力[2,3] 

机构地区：[1]中国科学院大学,北京100049 [2]中国科学院声学研究所,北京100190 [3]中国科学院水声环境特性重点实验室,北京100190

出　　处：《应用声学》2016年第3期272-276,共5页Journal of Applied Acoustics

基　　金：国家自然科学基金项目(11374323)

摘　　要：海底粗糙界面是产生混响的主要因素之一。本文通过理论分析和数值仿真的方法,根据浅海全波动混响模型对不同海底粗糙界面所引起浅海混响平均强度特性进行研究,主要考虑Goff-Jordan谱、Gauss谱和指数谱三种不同粗糙界面条件下的海底反向散射强度和混响平均强度特性。计算结果表明:海底粗糙界面会引起海底反向散射强度的频率特性的差异,进而导致海底平均混响强度的频率特性的差异,但随入射角度的变化不大。即使界面起伏的方差和相关长度相同,不同的粗糙度谱也会引起平均混响强度的差异。The rough bottom interface is one of the main factors which cause reverberation in shallow-water waveguide. The numerical simulations and theoretical analyses of the average reverberation intensity due to interface roughnesses have been performed based on the full wave reverberation theory. The roughness spectrum is used to describe rough bottom-surface. Three common roughness spectrums have been considered in the simulation, which are the Goff-Jordan spectrum, the Exponential spectrum and the Gaussian spectrum. The characteristics of bottom backscattering strength and the average reverberation intensity due to different bottom roughness spectrums have been calculated. The result shows that different bottom rough surfaces can cause the frequency dependency and angular dependency of bottom backscattering strength different. Furthermore, it can cause the frequency dependency of the average reverberation intensity changing. Different roughness spectrums with the same root mean square （RMS） and correlation length can cause the change in the average reverberation intensity.

关 键 词：浅海混响 Goff-Jordan谱 Gaussian谱 指数分布谱 

分 类 号：O427.2[理学—声学]