XIE Jinhuai; ZHANG Haigang; CAO Dejin

doi:10.7498/aps.74.20250656

Abstract

The low-grazing-angle reflection on elastic sediment seabed exhibits abnormally enhanced frequency characteristics, which significantly influences long-range sound propagation in shallow water. To study the influence of elastic sedimentary layer seabed environment on long-range sound propagation in shallow waters, we conduct a joint measurement of seabed and waveguide sound propagation in the Dongsha area of the South China Sea. The measurements show for the first time that the seabed resonance and the sound siphon effect occur simultaneously. Notably, this effect is different from the sound siphon effect observed in low-sound-speed seabed environments, as it exhibits smaller frequency intervals. By analyzing the low-grazing-angle reflection characteristics of the elastic seabed, we develop a theoretical model for the resonance frequencies of shear waves in elastic sediment layers under low grazing angles and investigate their influence on long-range sound propagation. The results indicate that under an elastic seabed model, the low-grazing-angle reflection modulated by shear waves induces resonance at specific frequencies within the sediment layer. This trap acoustic energy in the seabed, leading to the sound siphon effect. Furthermore, we analyze the sensitivity and coupling of key parameters related to the resonance frequency of shear wave. According to these findings, we develop an inversion strategy that integrates seabed and waveguide observations to estimate geo-acoustic parameters of the experimental area. The inversion results validate the mechanism by which the elastic seabed model contributes to the sound siphon effect in the water column.

Keywords:

Authors and contacts

Corresponding author: ZHANG Haigang, zhanghaigang@hrbeu.edu.cn

Funds: Project supported by the Young Scientists Fund of the National Natural Science Foundation of China (Grant No. 12404513).

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Cited By

DownLoad: Full-Size Img PowerPoint

海底声学参数	压缩波声速 /${\text{(m}} {\cdot} {{\text{s}}^{{{ - 1}}}})$	层厚 /${\text{m}}$	密度 /${\text{(g}} {\cdot} {\text{c}}{{\text{m}}^{{{ - 3}}}})$	压缩波衰减 /${\text{(dB}} {\cdot} {\lambda ^{{{ - 1}}}})$
水介质层	1499	100	1.0	0
沉积层	1465	15	1.6	0.1
基底	1650	—	1.9	0.2

DownLoad: CSV

声学参数	压缩波声速/${\text{(m}} {\cdot} {{\text{s}}^{{{ - 1}}}})$	剪切波声速/${\text{(m}} {\cdot} {{\text{s}}^{{{ - 1}}}})$	层厚/${\text{m}}$	密度/${\text{(g}} {\cdot} {\text{c}}{{\text{m}}^{{{ - 3}}}})$	压缩波衰减/${\text{(dB}} {\cdot} {\lambda ^{{{ - 1}}}})$	剪切波衰减/${\text{(dB}} {\cdot} {\lambda ^{{{ - 1}}}})$
水层	1499	—	100	1.0	0	—
沉积层	1600	700	15	1.6	0.1	0.1
基底	2800	1600	—	2.2	0.2	0.2

DownLoad: CSV

层	反演参数	寻优区间	反演结果
沉积层	${c_{{\text{p2}}}}/{\text{(m}} {\cdot} {{\text{s}}^{{{ - 1}}}})$	1550—1800	1640.7
	${c_{{\text{s2}}}}/{\text{(m}} {\cdot} {{\text{s}}^{{{ - 1}}}})$	500—800	681.0
	$h/{\text{m}}$	2—40	14.5
	${\rho _{2}}/{\text{(g}} {\cdot} {\text{c}}{{\text{m}}^{{{ - 3}}}})$	1.55—2.1	1.65
	${\alpha _{{\text{p2}}}}/{\text{(dB}} {\cdot} {\lambda ^{{{ - 1}}}})$	0.05—0.5	0.14
	${\alpha _{{\text{s2}}}}/{\text{(dB}} {\cdot} {\lambda ^{{{ - 1}}}})$	0.05—0.5	0.11
基底	${c_{{\text{p3}}}}/{\text{(m}} {\cdot} {{\text{s}}^{{{ - 1}}}})$	1850—3000	2476
	${c_{{\text{s3}}}}/{\text{(m}} {\cdot} {{\text{s}}^{{{ - 1}}}})$	1510—1800	1757.6
	${\rho _3}/{\text{(g}} {\cdot} {\text{c}}{{\text{m}}^{{{ - 3}}}})$	2.15—4.0	3.5
	${\alpha _{{\text{p3}}}}/{\text{(dB}} {\cdot} {\lambda ^{{{ - 1}}}})$	0.1—0.6	0.22
	${\alpha _{{\text{s3}}}}/{\text{(dB}} {\cdot} {\lambda ^{{{ - 1}}}})$	0.1—0.6	0.29

DownLoad: CSV

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