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The Effect of Mesoscale Eddy on the Characteristic of Sound Propagation
Article

Analysis of Underwater Acoustic Propagation under the Influence of Mesoscale Ocean Vortices

by 1,2,†, 1,2,*,†, 1,2 and 1,2
1
College of Underwater Acoustic Engineering, Harbin Engineering University, Harbin 150001, China
2
Acoustic Science Technology Laboratory, Harbin Engineering University, Harbin 150001, China
*
Author to whom correspondence should be addressed.
Sartaj Khan and Yang Song contributed equally to this work.
Academic Editor: Grigory Ivanovich Dolgikh
J. Mar. Sci. Eng. 2021, 9(8), 799; https://doi.org/10.3390/jmse9080799
Received: 28 June 2021 / Revised: 20 July 2021 / Accepted: 21 July 2021 / Published: 24 July 2021
(This article belongs to the Special Issue Sea Level Fluctuations)
Mesoscale ocean vortices are common phenomenon and fairly distributed over the global oceans. In this study, mesoscale vortex in the South China Sea is identified by processing of AIPOcean data. The characteristic parameters of the identified vortex are extracted by using Okubo-Weiss (OW) method. The empirical sound velocity formula and interpolation method are used to obtain the spatial characteristics of temperature and sound velocity of the mesoscale vortex. After this, a theoretical model based on the Gaussian method is established to fit and simulate the vortex parameters. Using this model, the influence of mesoscale vortex strength, cold and warm vortex, vortex center position and sound source frequency on sound propagation are analyzed in COMSOL software. Finally, the actual parameters of the identified vortex are compared with the ideal Gaussian vortex model. It is found that different types of mesoscale vortices have different effects on the underwater sound propagation characteristics. Cold vortices, for example, cause the sound energy convergence zone to move toward the sound source, reducing the convergence zone’s span, whereas warm vortices cause the sound energy convergence zone to move away from the sound source, increasing the convergence zone’s span. Furthermore, the stronger the mesoscale vortices, the greater the impact on the sound field. Our COMSOL-based results are consistent with previous research, indicating that this model could be useful for studying underwater acoustic propagation in vortices. View Full-Text
Keywords: mesoscale vortex; acoustic propagation; AIPOcean; OW method; COMSOL software mesoscale vortex; acoustic propagation; AIPOcean; OW method; COMSOL software
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MDPI and ACS Style

Khan, S.; Song, Y.; Huang, J.; Piao, S. Analysis of Underwater Acoustic Propagation under the Influence of Mesoscale Ocean Vortices. J. Mar. Sci. Eng. 2021, 9, 799. https://doi.org/10.3390/jmse9080799

AMA Style

Khan S, Song Y, Huang J, Piao S. Analysis of Underwater Acoustic Propagation under the Influence of Mesoscale Ocean Vortices. Journal of Marine Science and Engineering. 2021; 9(8):799. https://doi.org/10.3390/jmse9080799

Chicago/Turabian Style

Khan, Sartaj, Yang Song, Jian Huang, and Shengchun Piao. 2021. "Analysis of Underwater Acoustic Propagation under the Influence of Mesoscale Ocean Vortices" Journal of Marine Science and Engineering 9, no. 8: 799. https://doi.org/10.3390/jmse9080799

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