Effects of typhoon Tembin on underwater acoustic wave propagation in two kinds of deep sound channel

MA Zhi-kang; FU Dong-yang; QU Ke; ZHU Feng-qin

doi:10.3969/j.issn.1001-909X.2019.03.005

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Journal of Marine Sciences ›› 2019, Vol. 37 ›› Issue (3) : 40-48. DOI: 10.3969/j.issn.1001-909X.2019.03.005

Effects of typhoon Tembin on underwater acoustic wave propagation in two kinds of deep sound channel

MA Zhi-kang, FU Dong-yang^*, QU Ke, ZHU Feng-qin

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Abstract

Using RAM (Range dependent Acoustic Model) model which was based on parabolic equation algorithm and combined Argo floats with multi-satellite data, effects of typhoon on acoustic propagation characteristics for incomplete deep-sound channel(3 000 m) and complete deep-sound channel(5 500 m) were researched. Results show that the influence of typhoon on sea water is confined in surface layer, which is characterized by the thickening of the mixed-layer, zero temperature gradient and positive sound speed gradient in the mixed-layer. At a certain depth below the mixed-layer, the water temperature increases, and the corresponding sound speed increases. When the sound source is placed in the mixed-layer, sound propagation in sea surface layer will be affected, the surface waveguide sound propagation and leakage modes appear in both incomplete and complete deep-sound channels. When the source is under the mixed layer, typhoon makes the convergence zone close to the sound source under the condition of incomplete deep-sound channel.Under the condition of complete deep-sound channel, the disturbance of typhoon on the location of convergence zone is not obvious, but the flip depth of the sound wave increases nearly 500 m.

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typhoon / the western Pacific Ocean / sound propagation / parabolic equation

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MA Zhi-kang, FU Dong-yang, QU Ke, ZHU Feng-qin. Effects of typhoon Tembin on underwater acoustic wave propagation in two kinds of deep sound channel[J]. Journal of Marine Sciences. 2019, 37(3): 40-48 https://doi.org/10.3969/j.issn.1001-909X.2019.03.005

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