Sound Field in a Shallow-Water Arctic-Type Waveguide with a Bottom Containing a Gas-Saturated Sediment Layer

被引:12
|
作者
Grigoriev, V. A. [1 ]
Petnikov, V. G. [2 ]
Shatravin, A. V. [3 ]
机构
[1] Voronezh State Univ, Univ Skaya Pl 1, Voronezh 394018, Russia
[2] Russian Acad Sci, Prokhorov Gen Phys Inst, Ul Vavilova 38, Moscow 119991, Russia
[3] Russian Acad Sci, Shirshov Inst Oceanol, Nakhimovskii Pr 36, Moscow 117997, Russia
基金
俄罗斯基础研究基金会;
关键词
shallow water; fluid-elastic bottom; discrete mode spectrum; quasimodes; Pekeris cut; sound attenuation; sound speed in sediments; gas saturation; ATTENUATION; SEA;
D O I
10.1134/S1063771017040042
中图分类号
O42 [声学];
学科分类号
070206 ; 082403 ;
摘要
We have analyzed the possibility of mode description of a sound field in a shallow-water Arctic-type waveguide with a bottom containing a gas-saturated sediment fluid layer lying on an elastic half-space (permafrost). It has been established that the modes, including quasimodes, calculated using Pekeris cuts, yield the best description of the field in the water layer at small distances from the sound source on the order of 1-10 waveguide depths. Calculations of propagation losses in the waveguide for a thickness of the sediment layer comparable to or larger than the length of a sound wave in the sediments have shown that the sea bottom behaves like a homogeneous fluid half-space. Propagation losses sharply increase as the sound speed in the sediments approaches the sound speed in water. We have proposed a technique for estimating the sound speed in the sediment layer based on analysis of the attenuation curves of the sound field components corresponding to different sums of waveguide modes.
引用
收藏
页码:433 / 448
页数:16
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