Determination of sediment liquefaction depth based on <sup>210</sup>Pb, <sup>137</sup>Cs distribution and grain-size characteristic: Take the Chengdao sea area as an example

Sun Lu; Shan Hongxian; Zhang Hong; Liu Hanlu; Jia Yonggang

doi:10.12284/hyxb2023091

Volume 45 Issue 10

Oct. 2023

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Sun Lu，Shan Hongxian，Zhang Hong, et al. Determination of sediment liquefaction depth based on 210Pb, 137Cs distribution and grain-size characteristic: Take the Chengdao sea area as an example[J]. Haiyang Xuebao，2023, 45(10)：105–113 doi: 10.12284/hyxb2023091

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Sun Lu，Shan Hongxian，Zhang Hong, et al. Determination of sediment liquefaction depth based on ²¹⁰Pb, ¹³⁷Cs distribution and grain-size characteristic: Take the Chengdao sea area as an example[J]. Haiyang Xuebao，2023, 45(10)：105–113 doi: 10.12284/hyxb2023091

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Determination of sediment liquefaction depth based on ²¹⁰Pb, ¹³⁷Cs distribution and grain-size characteristic: Take the Chengdao sea area as an example

doi: 10.12284/hyxb2023091

Sun Lu^1
,,
Shan Hongxian^{1, 2},
Zhang Hong^{1, 3},
Liu Hanlu¹,
Jia Yonggang^{1, 2
,
,}

1.
Shandong Provincial Key Laboratory of Marine Environment and Geological Engineering, Ocean University of China, Qingdao 266100, China
2.
Laboratory for Marine Geology, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266061, China
3.
College of Engineering, Ocean University of China, Qingdao 266100, China

Received Date: 2022-10-25
Rev Recd Date: 2022-12-10

Available Online: 2023-11-17

Publish Date: 2023-10-30

Abstract

Abstract

The phenomenon of seabed liquefaction is widely distributed in the underwater delta of the Huanghe River, which poses a great threat to submarine engineering facilities. The determination of liquefaction depth can provide a reference for offshore engineering construction, which has great theoretical significance and application value. The columnar sediments were obtained by drilling in the liquefaction disturbance area of Chengdao sea area in the north of the Huanghe River Delta, and the profile image scanning, radionuclide and particle size composition testing were carried out to obtain the image stratification characteristics, ²¹⁰Pb, ¹³⁷Cs activity and particle size profile, and the deposition rate was calculated on this basis. The results show that the Chengdao sea area was significantly affected by the change of the Huanghe River from the Diaokou channel in 1976, and the sedimentation rate decreased significantly during this period and showed a phased character. During the rapid deposition period, the sand layer produced by frequent liquefaction of surface sediments accumulated continuously, thus forming the dense sand layer. By analyzing ²¹⁰Pb_ex and ¹³⁷Cs activity profiles, the sedimentary records of liquefaction history in the study area were obtained, and the historical liquefaction depth was determined to be at least 5 m, which is similar to previous studies. It is feasible to use the activity of ²¹⁰Pb and ¹³⁷Cs as tools to judge the history and depth of sediment liquefaction, which has great development potential.
- Huanghe River subaqueous delta,
- radionuclide,
- particle size characteristics,
- liquefaction depth

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