浅海混响以海底混响为主。本文选取对浅海近程海底混响贡献较大的声线采用射线声学理论，数值计算浅海3种典型声速分布下的海底混响时域信号和混响强度，分析声速分布、脉冲宽度及负跃层声速条件下声源深度对海底混响衰减的影响。计算结果表明：浅海近程混响强度随着时间振荡衰减，不同声速、不同声源深度下混响强度具有相似的衰减特性，但振荡衰减的“波峰”和“波谷”会随着声速分布、声源深度变化而变化。
Bottom reverberation was dominating in shallow sea. Time signal and intensity of bottom reverberation was numerically computed for three typical sound speed profiles which selected dominating sound rays based on ray acoustic theory in shallow sea. Influence of sound speed profiles and pulse width and sound source depth of thermocline sound speed profile to bottom reverberation intensity attenuation was analyzed. The results showed that the intensity of bottom reverberation in shallow sea fluctuantly minish with time, the intensity attenuation character of bottom reverberation in different source depth is similar, and wave crest and trough of attenuation change with sound speed profiles and sound source depth.
2017,39(6): 94-97 收稿日期：2017-04-13
DOI：10.3404/j.issn.1672-7619.2017.06.019
分类号：TN911
作者简介：曹雨露(1964-),男,高级工程师,主要从事目标水中特性研究和实艇测试分析。
参考文献：
[1] ELLIS D D. A shallow-water normal-mode reverberation model[J]. JASA, 1995, 97:2804-2814.
[2] 李凤华, 金国亮, 张仁和. 浅海相干混响理论与混响强度的振荡现象[J]. 中国科学A辑, 2000, 30(6).
[3] KEVIN B, SMITH and WILLIAM S. HODGKISS, Propagation and analysis issues in the prediction of long-range reverberation[J]. JASA, 1996, 99(3):1387-1404.
[4] HENRIK S, KUPERMAN W A. Spectral representation of rough interface reverberation in stratified ocean waveguides[J]. JASA, 1995, 97(4):2199-2209.
[5] 李凤华, 刘建军, 李整林, 等. 浅海低频混响的振荡现象及其物理解释[J]. 中国科学G辑, 2005, 30(2).
[6] 张林, 范培勤, 徐国军. 浅海负跃层对声传播影响的仿真研究[J]. 声学技术, 2013, 32(6).
