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Flow-Dependent Modeling of Acoustic Propagation Based on the DG-FEM Method

Zichen WangaSchool of Marine Science and Technology, Tianjin University, Tianjin, China

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Jian XuaSchool of Marine Science and Technology, Tianjin University, Tianjin, China

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Xuefeng ZhangaSchool of Marine Science and Technology, Tianjin University, Tianjin, China

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Can LuaSchool of Marine Science and Technology, Tianjin University, Tianjin, China

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Kangkang JinaSchool of Marine Science and Technology, Tianjin University, Tianjin, China

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Yinquan ZhangbKey Laboratory of Marine Environmental Information Technology, Tianjin, China

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Abstract

This paper proposes a two-dimensional underwater sound propagation model using the discontinuous Galerkin finite-element method (DG-FEM) to investigate the influence of current on sound propagation. The acoustic field is calculated by the convected wave equation with the current speed parameter. Based on the current speed data from an assimilation model, a two-dimensional coupled acoustic propagation model in the Fram Strait water area is established to observe the variability in propagation loss under different seasonal velocities in the real ocean environment. The transmission loss and signal time structure are examined. The results obtained in different source frequencies are also compared. It appears that the current velocity, time, and range variation all have an effect on underwater sound propagation.

© 2021 American Meteorological Society. For information regarding reuse of this content and general copyright information, consult the AMS Copyright Policy (www.ametsoc.org/PUBSReuseLicenses).

Corresponding author: Jian Xu, jian.xu@tju.edu.cn

Abstract

This paper proposes a two-dimensional underwater sound propagation model using the discontinuous Galerkin finite-element method (DG-FEM) to investigate the influence of current on sound propagation. The acoustic field is calculated by the convected wave equation with the current speed parameter. Based on the current speed data from an assimilation model, a two-dimensional coupled acoustic propagation model in the Fram Strait water area is established to observe the variability in propagation loss under different seasonal velocities in the real ocean environment. The transmission loss and signal time structure are examined. The results obtained in different source frequencies are also compared. It appears that the current velocity, time, and range variation all have an effect on underwater sound propagation.

© 2021 American Meteorological Society. For information regarding reuse of this content and general copyright information, consult the AMS Copyright Policy (www.ametsoc.org/PUBSReuseLicenses).

Corresponding author: Jian Xu, jian.xu@tju.edu.cn
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