基于图表法的南海北部表面声道分布与成因分析  

Study on the Distribution And Causation of Surface Sound Duct in the Northern South China Sea Based on Diagrammatic Method

作　　者：占鑫伟 屈科 刘宏伟 谢金怀 ZHAN Xin-wei;QU Ke;LIU Hong-wei;XIE Jin-huai(College of Electronicsand Information Engineering,Guangdong Ocean University,Zhanjiang 524088,China;726th Research Institute of CSIC Heavy Industries Group,China Shipbuilding Industry Corporation,Lianyungang 222136,China)

机构地区：[1]广东海洋大学电子与信息工程学院,广东湛江524088 [2]中国船舶重工集团公司第七一六研究所,江苏连云港222136

出　　处：《海洋技术学报》2020年第5期53-57,共5页Journal of Ocean Technology

基　　金：广东海洋大学教育教学改革资助项目(524210380);广东海洋大学海洋声学信息处理创新团队资助项目(CCTD201822);大学生创新创业训练计划资助项目(CXXL2019253)。

摘　　要：表面声道是一种远距离声传输波导,了解和研究表面声道的分布与成因对提高目标海区声呐的性能有重要意义。本文基于遥感数据,对南海北部表面声道的分布成因进行研究。采用图表法就温度梯度、盐度梯度对声道形成的贡献进行定量研究,给出了声道的类型分布,并结合海洋动力活动及海气相互作用对成因进行分析。研究结果表明:春季南海北部表面声道受珠江口冲淡水影响有少量盐度声道分布,远深海地区受风场影响有较多静压声道分布;夏季在珠江口强烈的冲淡水影响下产生大范围盐度声道;秋季冲淡水产生的盐度声道减弱,因风场产生的静压声道相较夏季增多;冬季受东北季风影响,产生几乎覆盖南海北部的大范围静压声道。在粤东沿岸、台湾沿岸的上升流对盐度、混合声道的产生也有较大影响。Surface sound duct is an long-distance sound transmission waveguide. In order to improve the performance of sonar systems in the target sea area, it is important to understand the distribution and causes of surface sound duct. Based on remote sensing data, this paper researches the distribution and causation of surface sound duct in the northern South China Sea. To produce a quantitative research, a diagrammatic method is applied to study the contributions of temperature gradient and salinity gradient to the formation of surface sound duct. The distribution types of sound duct are given, and the causes are analyzed in combination with ocean dynamic activities and air-sea interaction. The results show that a few haline ducts exist in the Pearl River Estuary in spring because of the freshing effect. Hydrostatic ducts exist in the deep sea area as a result of the wind. A lot of haline ducts exist in the Pearl River Estuary in summer on account of the strong freshing effect. The scope of haline duct resulting in freshing is reduced in fall and the scope of hydrostatic duct causing the windincreases in fall. The northern South China Sea is almost covered with the hydrostatic duct in winter because of the strong northeastern wind. In the coast of Guangdong and Taiwan Provinces upwelling has an important influence on the formation of haline ducts and hybrid ducts.

关 键 词：南海北部海域 表面声道 图表法 

分 类 号：P733.23[天文地球—物理海洋学]