Physical properties of the seabed inversed based on Chirp data and the Biot-Stoll model in the northern continental slope of the South China Sea

Zhou Qingjie; Li Xishuang; Liu Lejun; Liu Yangting; Gao Shan; Zhou Hang; Wang Jingqiang; Li Tianguang

doi:10.3969/j.issn.0253-4193.2020.03.007

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Zhou Qingjie，Li Xishuang，Liu Lejun, et al. Physical properties of the seabed inversed based on Chirp data and the Biot-Stoll model in the northern continental slope of the South China Sea[J]. Haiyang Xuebao，2020, 42(3)：72–82，doi:10.3969/j.issn.0253−4193.2020.03.007

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Physical properties of the seabed inversed based on Chirp data and the Biot-Stoll model in the northern continental slope of the South China Sea

doi: 10.3969/j.issn.0253-4193.2020.03.007

Zhou Qingjie^{1, 2
,},
Li Xishuang^{1, 3
,
,},
Liu Lejun¹,
Liu Yangting^{1, 2},
Gao Shan^{1, 2},
Zhou Hang¹,
Wang Jingqiang^{1, 2},
Li Tianguang¹

1.
Key Laboratory of Marine Sedimentology and Environmental Geology, First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, China
2.
Laboratory for Marine Geology, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266061, China
3.
Laboratory for Marine Mineral Resources, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266071, China

Received Date: 2019-05-21
Rev Recd Date: 2019-08-27

Available Online: 2020-11-18

Publish Date: 2020-03-25

Abstract

Abstract

Sub-bottom profile is based on the acoustic signal (frequency in hundreds to thousands Hz) in the sediment propagation to reflect the sedimentary formation structure. The seabed reflection coefficient is closely related to the sediments physical properties. The Biot-Stoll theoretical model can predict the physical properties of seabed sediments and establish the relationship between acoustic parameters such as reflection coefficient and physical parameters, but the results obtained by using different parameters in different sea areas are different. For this, this article is based on the measured sediments physical parameters in the northern slope of the South China Sea to establish the relationship between the reflection coefficient and the sediments physical parameters based on Biot-Stoll model. The results show that the calculated value of the model is in good agreement with the measured value of the sample, and the equation for the relationship between the bottom reflection coefficient and the porosity, density, mean grain size of sediments at a frequency of 3.5 kHz is established. The equation has a high fitting degree, and the determination coefficient R² is all greater than 0.99. On the basis of calculating the seabed reflection coefficient by the typical Chirp profile data, the porosity, density and mean grain size of the sub-bottom sediments are inversed. The relative errors of the inversion porosity, density, mean grain size and the measured porosity, density, mean grain size are all less than 5%, and the results are basically consistent with the measured values, indicating that the inversion method is feasible in the northern continental slope area of the South China Sea.
- Chirp sub-bottom profile data,
- Biot-Stoll model,
- seabed reflection coefficient,
- physical properties of sediments,
- northern slope of the South China Sea

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References(35)

References

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