| ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS |
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Acoustic propagation uncertainty in internal wave environments using an ocean-acoustic joint model |
| Fei Gao(高飞)1,2, Fanghua Xu(徐芳华)1,†, Zhenglin Li(李整林)3, Jixing Qin(秦继兴)4,‡, and Qinya Zhang(章沁雅)1 |
1 Department of Earth System Science, Ministry of Education Key Laboratory of Earth System Modeling, Institute for Global Change Studies, Tsinghua University, Beijing 100084, China;
2 Naval Research Institute, Tianjin 300061, China;
3 School of Ocean Engineering and technology, Sun Yat-Sen University, Zhuhai 519000, China;
4 State Key Laboratory of Acoustics, Institute of Acoustics, Chinese Academy of Sciences, Beijing 100190, China |
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Abstract An ocean-acoustic joint model is developed for research of acoustic propagation uncertainty in internal wave environments. The internal waves are numerically produced by tidal forcing over a continental slope using an ocean model. Three parameters (i.e., internal wave, source depth, and water depth) contribute to the dynamic waveguide environments, and result in stochastic sound fields. The sensitivity of the transmission loss (TL) to environment parameters, statistical characteristics of the TL variation, and the associated physical mechanisms are investigated by the Sobol sensitivity analysis method, the Monte Carlo sampling, and the coupled normal mode theory, respectively. The results show that the TL is most sensitive to the source depth in the near field, resulted from the initial amplitudes of higher-order modes; while in middle and far fields, the internal waves are responsible for more than 80% of the total acoustic propagation contribution. In addition, the standard deviation of the TL in the near field and the shallow layer is smaller than those in the middle and far fields and the deep layer.
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Received: 24 May 2022
Revised: 31 July 2022
Accepted manuscript online: 16 August 2022
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PACS:
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92.10.Vz
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(Underwater sound)
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43.30.Bp
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(Normal mode propagation of sound in water)
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43.30.Re
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(Signal coherence or fluctuation due to sound propagation/scattering in the ocean)
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| Fund: Project supported by the National Key Research and Development Program of China (Grant No. 2020YFA0607900), the National Natural Science Foundation of China (Grant Nos. 42176019 and 11874061), and the Youth Innovation Promotion Association CAS (Grant No. 2021023). |
Corresponding Authors:
Fanghua Xu, Jixing Qin
E-mail: fxu@mails.tsinghua.edu.cn;qjx@mail.ioa.ac.cn
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Cite this article:
Fei Gao(高飞), Fanghua Xu(徐芳华), Zhenglin Li(李整林), Jixing Qin(秦继兴), and Qinya Zhang(章沁雅) Acoustic propagation uncertainty in internal wave environments using an ocean-acoustic joint model 2023 Chin. Phys. B 32 034302
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