Investigation of Sea Surface Effect on Shallow Water Reverberation by Coupled Mode Method

Gao, Bo; Wang, Ning; Wang, Hao Zhong

doi:10.1142/s0218396x17500175

Cited by 5 publications

(1 citation statement)

References 19 publications

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“…25, No. 2 (2017) 1750017 (12 pages)" [26]. The simulated curves in the paper were all the averaged incoherent correlation coefficients, and corresponding Equation ( 13) also considered the process of the nth incident mode and the nth scattering mode.…”

Section: Resultsmentioning

confidence: 99%

Horizontal Correlation of Long-Range Bottom Reverberation in Shallow Sloping Seabed

Zhang

Gao

2021

JMSE

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The performance of active sonar detection systems is seriously affected by the reverberation at the bottom of the waveguide in shallow water. In order to improve the performance of active sonar detection, it is necessary to understand the horizontal correlation of shallow-water bottom reverberation in active towed-array processing technology. However, the current research on the spatial correlation of reverberation is mainly based on vertical correlation, little work has been done on the horizontal correlation characteristics of long-distance seabed reverberation, and there is no support from sea test data. In this paper, the coupled mode reverberation model is applied to the horizontal correlation, and is studied according to the receiving position, time, and frequency. The simulation results show that, for the long-range bottom reverberation, the lateral correlation is greater than the longitudinal correlation in the horizontal space. By introducing the adiabatic mode solution, the mathematical model of horizontal correlation in the range-dependent waveguide with depth is derived. The numerical results show that the influence of the seabed dip angle on the horizontal correlation should be considered and that the horizontal correlation is affected obviously by the propagation effects of the sloped sea floor. Finally, the experimental data processing and analysis are given and verify the correctness of the algorithm.

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Section: Resultsmentioning

confidence: 99%

Horizontal Correlation of Long-Range Bottom Reverberation in Shallow Sloping Seabed

Zhang

Gao

2021

JMSE

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A Coupled Mode Method for Low Frequency Distant Reverberation in Deep Water Environment with Ice Covers

Zuo

Gao

Song

et al. 2021

2021 OES China Ocean Acoustics (COA)

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Modeling propagation in shallow water with the range-dependent sea surfaces and fluid seabeds using the equivalent source method

Wei

et al. 2021

The Journal of the Acoustical Society of America

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This paper describes a shallow water range-dependent propagation model (RPM) based on the equivalent source method (ESM). The proposed model allows both the sea surface and fluid seabed to vary with the propagation range. The proposed equivalent source method-based range-dependent propagation model (ESM-RPM) utilizes three sets of equivalent sources, placed above the sea surface, below the seabed, and above the seabed, which replace the sea surface reflection, seabed reflection, and seabed transmission, respectively. The unknown strengths of the equivalent sources can be determined by solving an inverse problem based on the boundary conditions. The capability of the ESM-RPM for propagation in refractive water is demonstrated by evaluating the Green's function using a modal projection method. Numerical simulations are conducted in iso-velocity and refractive shallow water with an underwater canyon and corrugated surface waves, including two-dimensional (2-D) propagation across the canyon and three-dimensional (3-D) propagation along the canyon. Further simulations demonstrate the 2-D across-canyon and 3-D along-canyon propagations with random rough sea surfaces. The results show that the proposed ESM-RPM provides efficient, benchmark-quality numerical solutions that accurately capture the mode coupling associated with the varying cross section of the waveguide. Thus, the model has great potential to be applied in benchmarking propagation in shallow water with the varying sea surface and seabed.

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Investigation of Sea Surface Effect on Shallow Water Reverberation by Coupled Mode Method

Cited by 5 publications

References 19 publications

Horizontal Correlation of Long-Range Bottom Reverberation in Shallow Sloping Seabed

Horizontal Correlation of Long-Range Bottom Reverberation in Shallow Sloping Seabed

A Coupled Mode Method for Low Frequency Distant Reverberation in Deep Water Environment with Ice Covers

Modeling propagation in shallow water with the range-dependent sea surfaces and fluid seabeds using the equivalent source method

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