| 深海不完整声道下反转点会聚区研究 |
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| 引用本文： | 朴胜春,栗子洋,王笑寒,张明辉.深海不完整声道下反转点会聚区研究[J].物理学报,2021(2):337-346. |
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| 作者姓名： | 朴胜春 栗子洋 王笑寒 张明辉 |
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| 作者单位： | 哈尔滨工程大学;哈尔滨工程大学;哈尔滨工程大学水声工程学院 |
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| 基金项目： | 国家自然科学基金(批准号:11234002);国防科工局稳定支持项目(批准号:JCKYS2020604SSJS004)资助的课题. |
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| 摘 要： | 近期南海远程声传播实验数据的处理分析表明在深海不完整声道中声道轴以下存在一种会聚区,该会聚区相比于海面附近的上反转点会聚区在远距离处具有更高的会聚增益.本文利用射线简正波理论确定了水中反转型焦散线和海面反射型焦散线位置,对比发现实验中观测到的深海大深度会聚区位置与水中反转型焦散线位置一致,证明该会聚区是由大量简正波同相叠加形成的下反转点会聚区,其在深海声道轴以下的一定深度范围内都具有会聚效应,研究了该会聚区的形成条件以及声源深度变化对会聚区焦散结构的影响,对比了远距离处上下反转点会聚区的传播损失以及会聚区宽度,分析表明第七个下反转点会聚区的会聚增益仍不小于10 dB,研究了声速垂直结构变化对下反转点会聚区的影响,理论分析结果与实验数据吻合较好.
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| 关 键 词： | 会聚效应 焦散线 下反转点 传播损失 |
Lower turning point convegence zone in deep water with an incomplete channel |
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| Piao Sheng-Chun,Li Zi-Yang,Wang Xiao-Han,Zhang Ming-Hui.Lower turning point convegence zone in deep water with an incomplete channel[J].Acta Physica Sinica,2021(2):337-346. |
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| Authors: | Piao Sheng-Chun Li Zi-Yang Wang Xiao-Han Zhang Ming-Hui |
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| Affiliation: | (State Key Laboratory of Underwater Acoustic Technology,Harbin Engineering University,Harbin 150001,China;Key Laboratory of Marine Information Acquisition and Security,Ministry of Industry and Information Technology,Harbin Engineering University,Harbin 150001,China;College of Underwater Acoustic Engeering,Harbin Engineering University,Harbin 150001,China) |
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| Abstract: | In a deep sea sound channel,rays will bend due to the sound speed profile,and convergence zone will occur when the rays are intensive.Transmission loss in the convergence zone is smaller and it is conducive to acoustic detection and communication.Therefore the study of acoustic characteristics in convergence zone is always the focus of deep-sea acoustics.A long-range sound propagation experiment is conducted in the South China Sea.An equivalent broadband explosive sound source of 1 kg is placed at a depth of 200 m,and the hydrophone receives the data at 3146 m far.The processing and analysis of the experimental data indicate that there is a convergence zone below the sound channel axis in the incomplete deep channel.Compared with the upper turning point convergence zone near the surface,this convergence zone has a high convergence gain at a long distance.The caustic lines of refracted type and refracted surface-refleted type are determined by means of raynormal mode theory.It is found that the location of the deep convergence zone observed in the experiment is consistent with the position of the refracted caustic line.It is proved that the convergence zone is a lower turning point convergence zone formed by the superposition of a large number of normal modes in the same phase,and it has a convergence effect at a certain depth below the sound channel axis in the deep sea.The formation conditions of the convergence zone and the influence of sound source depth on the caustic structure of the convergence zone are studied.The comparisons of the transmission loss and the width between the upper and lower turning point convergence zone at a long distance aremade.The analysis shows that the convergence gain in the seventh lower turning point convergence zone is still no less than 10 dB.The influence of the vertical structure of sound velocity on the lower turning point convergence zone is studied.The theoretical analysis results are in good agreement with the experimental data. |
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| Keywords: | convergence effect caustics lower turning point transmission loss |
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