中国物理B ›› 2022, Vol. 31 ›› Issue (11): 114302-114302.doi: 10.1088/1674-1056/ac6014

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Effects of mesoscale eddies on the spatial coherence of a middle range sound field in deep water

Fei Gao(高飞)1,2,†, Fang-Hua Xu(徐芳华)1, and Zheng-Lin Li(李整林)3   

  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
  • 收稿日期:2021-12-11 修回日期:2022-03-21 接受日期:2022-03-23 出版日期:2022-10-17 发布日期:2022-10-25
  • 通讯作者: Fei Gao E-mail:gao-f21@mails.tsinghua.edu.cn
  • 基金资助:
    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).

Effects of mesoscale eddies on the spatial coherence of a middle range sound field in deep water

Fei Gao(高飞)1,2,†, Fang-Hua Xu(徐芳华)1, and Zheng-Lin Li(李整林)3   

  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
  • Received:2021-12-11 Revised:2022-03-21 Accepted:2022-03-23 Online:2022-10-17 Published:2022-10-25
  • Contact: Fei Gao E-mail:gao-f21@mails.tsinghua.edu.cn
  • Supported by:
    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).

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摘要： Mesoscale eddies have a remarkable influence on the underwater sound field. Many previous studies have investigated the effects of eddies on transmission loss, the convergence zone, time delay, etc. However, the effects of eddies on spatial coherence are less well studied and remain unclear. In this paper, the effects of eddies on spatial coherence at the subsurface in deep water are investigated. The eddy environments are simulated with Gaussian eddy equations, the complex pressure field is obtained using a range-dependent parabolic equation model and the associated mechanism is analyzed based on ray theory and models. The results show that cold/warm mesoscale eddies affect spatial coherence in a high-intensity zone by changing the locations and width of the convergence zone. In the shadow zone, the horizontal correlation radius and the vertical correlation radius increase with range and decrease with depth, and they are increased by warm eddies and decreased by cold eddies, mainly caused by variation of the multipath structure.

关键词: mesoscale eddy, horizontal coherence, vertical coherence, multipath arrivals

Abstract: Mesoscale eddies have a remarkable influence on the underwater sound field. Many previous studies have investigated the effects of eddies on transmission loss, the convergence zone, time delay, etc. However, the effects of eddies on spatial coherence are less well studied and remain unclear. In this paper, the effects of eddies on spatial coherence at the subsurface in deep water are investigated. The eddy environments are simulated with Gaussian eddy equations, the complex pressure field is obtained using a range-dependent parabolic equation model and the associated mechanism is analyzed based on ray theory and models. The results show that cold/warm mesoscale eddies affect spatial coherence in a high-intensity zone by changing the locations and width of the convergence zone. In the shadow zone, the horizontal correlation radius and the vertical correlation radius increase with range and decrease with depth, and they are increased by warm eddies and decreased by cold eddies, mainly caused by variation of the multipath structure.

Key words: mesoscale eddy, horizontal coherence, vertical coherence, multipath arrivals

中图分类号:  (Underwater sound)

  • 43.30.+m
43.30.Bp (Normal mode propagation of sound in water) 43.30.Cq (Ray propagation of sound in water) 92.10.Vz (Underwater sound)