Basic geoacoustic structure and geoacoustic model for seafloor sediments

Zou Dapeng; Wu Zhilin; Sun Han; Liu Wei; Ji Xuanrong; Xiao Tibing

doi:10.12284/hyxb2022091

Volume 44 Issue 9

Aug. 2022

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Zou Dapeng，Wu Zhilin，Sun Han, et al. Basic geoacoustic structure and geoacoustic model for seafloor sediments[J]. Haiyang Xuebao，2022, 44(9)：145–155 doi: 10.12284/hyxb2022091

Citation:

Zou Dapeng，Wu Zhilin，Sun Han, et al. Basic geoacoustic structure and geoacoustic model for seafloor sediments[J]. Haiyang Xuebao，2022, 44(9)：145–155 doi: 10.12284/hyxb2022091

Citation:

Zou Dapeng，Wu Zhilin，Sun Han, et al. Basic geoacoustic structure and geoacoustic model for seafloor sediments[J]. Haiyang Xuebao，2022, 44(9)：145–155 doi: 10.12284/hyxb2022091

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Basic geoacoustic structure and geoacoustic model for seafloor sediments

doi: 10.12284/hyxb2022091

Zou Dapeng^{1, 2, 3
,
,},
Wu Zhilin¹,
Sun Han^{1, 3},
Liu Wei^{1, 2
,
,},
Ji Xuanrong^{1, 3},
Xiao Tibing¹

1.
School of Electromechanical Engineering, Guangdong University of Technology, Guangzhou 510006, China
2.
State Key Laboratory of Acoustics, Institute of Acoustics, Chinese Academy of Sciences, Beijing 100190, China
3.
State Key Laboratory of Precision Electronic Manufacturing Technology and Equipment, Guangdong University of Technology, Guangzhou 510006, China

Received Date: 2021-10-20
Rev Recd Date: 2022-01-20

Available Online: 2022-04-18

Publish Date: 2022-08-29

Abstract

Abstract

To accurately establish a geoacoustic model for seafloor sediments, the elemental composition and structure of the geoacoustic model are explored in this paper. Based on the laboratory measurements of seafloor sediment samples, the buried depth relationship between density, porosity, and sound velocity of seafloor surface sediments in the South China Sea is analyzed. Four typical seafloor geoacoustic structures are obtained: low sound velocity surface-sound velocity slow change type, low sound velocity surface-sound velocity increase type, high sound velocity surface-sound velocity slow change type, and high sound velocity surface-sound velocity increase type. By comparing the drilling survey and analyzing the buried depth relationship between density, porosity, and sound velocity of seafloor sediments in the Yellow Sea, the actual layered characteristics and the combination characteristics of the geoacoustic structure are obtained. It shows that the geoacoustic model can be attributed to a combination of four basic geoacoustic structures. Various actual seafloor geoacoustic models can be derived from the comparisons between the acoustic sound speed of the bottom seawater, the sound velocity profile of seafloor sediments in the same layer, and the bottom sound velocity of the upper sediment. The geoacoustic model based on the laboratory measurement analysis of seafloor sediment samples can be used as a reference geoacoustic model. However, it should be modified with the sound velocity ratio correction method and theoretical calculation method of dispersion characteristics with the consideration of the actual seafloor temperature gradient, pressure gradient, and dispersion characteristics of seafloor sediment.
- geoacoustic model,
- geoacoustic structure,
- seafloor sediments,
- sound velocity,
- frequency dispersion

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References(46)

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