| 三维浅海环境下孤立子内波对低频声能流的传播影响 |
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| 引用本文： | 祝捍皓,肖瑞,朱军,薛洋洋,张士钊.三维浅海环境下孤立子内波对低频声能流的传播影响[J].声学学报,2021,46(3):365-374. |
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| 作者姓名： | 祝捍皓 肖瑞 朱军 薛洋洋 张士钊 |
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| 作者单位： | 1. 浙江海洋大学 海洋科学与技术学院 舟山 316022; |
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| 基金项目： | 国家自然科学基金项目(11704337)、浙江省海洋观察-成像试验区重点实验室资助项目(OOIT2018OF05)、水声技术重点实验室基金项目(6142108190102)和国防基础科研计划实验室稳定支持专题项目(JCKYS2020604SSJS011) |
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| 摘 要： | 针对三维浅海环境下孤立子内波对低频声信号传播特性的影响问题,基于Oxyz坐标系下的三维浅海低频声场有限元计算方法,以声能流为研究对象,仿真分析了内波存在对低频声信号传播特性的影响规律。研究结果表明:受内波影响,在xOz平面,声能流垂直分量的传播偏转角度呈现周期性的起伏规律;随着声源深度的增加,内波对声能流偏转角度的影响深度也随之增加。对xOy平面,当声源位于温跃层以上时,随着接收深度的增加,各深度平面上声能流水平分量的偏转角越大;随着声源深度的增加,内波对各深度平面上声能流的影响逐渐减弱。
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| 关 键 词： | 三维声场 孤立子内波 声能流 水平偏转 |
| 收稿时间： | 2020-01-10 |
Influence of internal solitary waves on sound propagation in three-dimensional shallow sea |
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| Institution: | 1. Institute of Marine Science and Technology, Zhejiang Ocean University, Zhoushan 316022;2. Key Laboratory of Ocean Observation-Imaging Testbed of Zhejiang Province, Zhejiang University, Zhoushan 316021;3. Institute of Naval Architecture and Mechanical-electrical Engineering, Zhejiang Ocean University, Zhoushan 316022;4. College of Underwater Acoustic Engineering, Harbin Engineering University, Harbin 150001 |
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| Abstract: | In allusion to the influence of internal solitary wave on the low-frequency sound propagation in threedimensional shallow sea,the influence rules of internal wave on the propagation characteristics of low-frequency acoustic signal are simulated and analyzed in a study of sound energy flux,which is based on the finite element method of three-dimensional low-frequency sound field in shallow sea under Oxyz coordinate system.The result shows that,under the influence of internal wave,in the xOz plane,the deflection angle of the acoustic energy flux's vertical component follows a periodic fluctuation rule,when the acoustic source depth increasing,the influence depth of internal wave on the deflection angle also increases.In the xOy plane,when the source is above the thermo cline,the deflection angle of the acoustic energy flux's horizontal component would be wider with the increasing of receiving depth,and the influence of internal wave on acoustic energy flux would be weakens with the increasing of source depth. |
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