Broadband Acoustic Field in a Shallow-Water Waveguide with an Inhomogeneous Bottom

IF 0.9 4区物理与天体物理 Q4 ACOUSTICS

Acoustical Physics Pub Date : 2023-11-16 DOI:10.1134/S1063771023600663

D. D. Sidorov, V. G. Petnikov, A. A. Lunkov

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Abstract—A broadband (35–1000 Hz) sound field formed by a point source in a shelf zone with inhomogeneous bottom sediment structure is studied using numerical modeling. The shelf depth is about 30 m and the maximum distance is 10 km. The transitional zone from the bottom with a sound speed of 1400 m/s to the bottom with a speed of 1600 m/s is chosen as the model inhomogeneity. The normal mode theory and wide-angle parabolic equations are used for sound field calculations. Numerical experiments show that the manifestation of horizontal refraction is noticeable at low frequencies (below 100 Hz). It leads to an increase in the amplitude of the low-frequency sound pulse propagating along the transitional zone by more than 10 dB in comparison with a similar waveguide with a homogeneous bottom. At frequencies above 100 Hz, the dominant effect is the mode coupling, causing the appearance of quasi-periodic oscillations of modal amplitude in the frequency domain. The conclusions from the simplified model are confirmed by calculations for the real structure of bottom sediments in the Kara Sea.

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底部非均匀浅水波导中的宽带声场

摘要采用数值模拟方法研究了非均匀底泥结构陆架带中点源形成的宽带(35 ~ 1000 Hz)声场。陆架深度约为30 m，最大距离为10 km。选取声速为1400 m/s的底部到声速为1600 m/s的底部过渡区域作为模型非均匀性。采用正交模态理论和广角抛物方程进行声场计算。数值实验表明，在低频率(100hz以下)下，水平折射现象较为明显。与具有均匀底部的类似波导相比，它导致沿过渡区传播的低频声脉冲幅度增加了10 dB以上。在频率高于100hz时，主导效应是模态耦合，导致频域中模态振幅的准周期振荡的出现。通过对喀拉海海底沉积物实际结构的计算，证实了简化模型的结论。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Acoustical Physics 物理-声学

CiteScore

1.60

自引率

50.00%

发文量

审稿时长

3.5 months

期刊介绍： Acoustical Physics is an international peer reviewed journal published with the participation of the Russian Academy of Sciences. It covers theoretical and experimental aspects of basic and applied acoustics: classical problems of linear acoustics and wave theory; nonlinear acoustics; physical acoustics; ocean acoustics and hydroacoustics; atmospheric and aeroacoustics; acoustics of structurally inhomogeneous solids; geological acoustics; acoustical ecology, noise and vibration; chamber acoustics, musical acoustics; acoustic signals processing, computer simulations; acoustics of living systems, biomedical acoustics; physical principles of engineering acoustics. The journal publishes critical reviews, original articles, short communications, and letters to the editor. It covers theoretical and experimental aspects of basic and applied acoustics. The journal welcomes manuscripts from all countries in the English or Russian language.