摘要
利用2001年3月东海PN断面"973"调查获得的CTD数据,用数值模拟方法研究了PN断面黑潮区域海底起伏对声传播的影响。由深水区向浅水区传播,随着海底的抬升声线的海底反射和海面反射次数增加,声强衰减更快,限制声传播距离。由浅水区向深水区传播,随着海底降低声线上反转点深度增加,传播一定距离后部分声线不能到达上层水体,于是声强衰减也增快。
Based on the CTD data collected on PN section in the East China Sea during March of 2001, the numerical simulation method is used to study the effect of sea-bottom undulation on sound propagation on PN section in the Kuroshio area. In the case travelling from deep water area to shallow water area, the (increasing) sea bottom and surface reflection times of sound ray and the rapid sound intensity attenuation with the rising sea bottom restrict the sound propagation distance. In the case travelling from shallow water area to deep water area, the upper turning point depth of sound ray increases with the descending sea bottom, and a part of sound rays can not reach the upper water after travelling a certain distance so as to speed up the sound intensity attenuation.
出处
《海洋科学进展》
CAS
CSCD
北大核心
2003年第4期432-436,共5页
Advances in Marine Science
基金
国家自然科学基金项目--河口
海湾海浪谱反演模型及波谱对颗粒物的搅拌作用(40206003)
国家重点基础研究发展规划项目--中国近海环流形成变异机理
数值预测方法及对环境影响的研究(G1999043811)
关键词
海底起伏
声传播
传播损失
PN断面
黑潮
sea-bottom undulation
sound propagation
transmission loss
PN section
Kuroshio
