文献类型：期刊文献

中文题名：珠江口低盐透镜现象的声传播特性分析

英文题名：Analysis of acoustic propagation characteristics of the low salinitylens outside the Pearl River Estuary

作者：屈科[1];莫龙影[1];黎章龙[1]

机构：[1]广东海洋大学电子与信息工程学院

年份：2019

卷号：37

期号：1

起止页码：15

中文期刊名：海洋学研究

外文期刊名：Journal of Marine Sciences

收录：CSTPCD、、北大核心2017、CSCD2019_2020、北大核心、CSCD

基金：广东省自然科学基金项目资助(2014A030310256);广东海洋大学优秀青年骨干教师培养项目资助(HDYQ2015010);广东海洋大学海洋声学信息处理创新团队项目资助(CCTD201822)

语种：中文

中文关键词：珠江口;低盐透镜;传播损失;声道

外文关键词：Pearl River Estuary;low salinity lens;transmission loss;acoustic channel

中文摘要：低盐透镜现象是珠江口陆架海域常见的一种中尺度现象,它的出现会影响水下声传播环境。利用南海北部陆架区的CTD资料分析了低盐透镜的结构特征,基于简正波和射线模型,建立二维波导环境,设置不同声源条件,对低盐透镜环境的声传播特性进行了研究。结果表明:低盐透镜会在海水上层形成声道,距离15km处其传播损失较没有低盐透镜的情况小约15dB。虽然低盐透镜声道厚度通常较小,但是较大的盐度梯度可以保证声道对声能的有效传播。当频率高于截止频率的声源置于低盐透镜内,声道效应有助于声音的远距离传播。

外文摘要：Low salinity lens is a common mesoscale phenomenon in the continental shelf outside the Pearl River Estuary,and its appearance will affect the underwater acoustic waveguide.The structure characteristics of low salinity lenses were analyzed based on the CTD profiles in the northern shelf of the South China Sea.Based on the normal mode and ray model,the two-dimensional waveguide environment was established,the characteristics of sound transmission in the low salinity lenses environment were studied under different sound source conditions.The results show that the low salinity lens will become the acoustic channel in the upper layer of sea water,and the transmission loss at 15 km is about 15 dB less than that without low salinity lens.Although the channel thickness of low salinity lens is usually smaller than surface acoustic channel,the large salinity gradient can effectively trap energy in the acoustic channel.When the sound source whose frequency is higher than the cut-off frequency is placed in a low-salt lens,the acoustic channel can help the long-distance propagation of sound.