基于<sup>210</sup>Pb、<sup>137</sup>Cs分布和粒度特征的海床液化深度判定研究

孙璐; 单红仙; 张红; 刘汉露; 贾永刚

doi:10.12284/hyxb2023091

基于²¹⁰Pb、¹³⁷Cs分布和粒度特征的海床液化深度判定研究以埕岛海域为例

doi: 10.12284/hyxb2023091

孙璐^1,,
单红仙^{1, 2},
张红^{1, 3},
刘汉露¹,
贾永刚^{1, 2, ,}

1.
中国海洋大学山东省海洋环境地质工程重点实验室，山东青岛 266100
2.
青岛海洋科学与技术试点国家实验室海洋地质过程与环境功能实验室，山东青岛 266061
3.
中国海洋大学工程学院，山东青岛 266100

基金项目: 国家自然科学基金项目（41877223，42207181，U1906230）。

详细信息

作者简介:
孙璐（1997—），女，山东省青岛市人，从事沉积物液化机制研究。E-mail：sunlu9204@stu.ouc.edu.cn

通讯作者:
贾永刚（1965—），男，教授，主要从事海洋工程地质与海洋岩土工程研究。E-mail: yonggang@ouc.edu.cn

中图分类号: P736.2
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出版历程
- 收稿日期: 2022-10-25
- 修回日期: 2022-12-10
- 网络出版日期: 2023-11-17
- 刊出日期: 2023-10-30

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

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

摘要

摘要: 黄河水下三角洲海床液化现象分布广泛，对海底工程设施造成了极大威胁，确定液化深度可为海上工程建设提供参考，具有很大的理论意义和应用价值。在黄河水下三角洲北部埕岛海域液化扰动区钻探取得柱状沉积物对其进行剖面图像扫描、放射性核素和粒度成分测试，获得图像分层特征、²¹⁰Pb、¹³⁷Cs活度及粒度剖面，在此基础上计算得到沉积速率。结果表明：埕岛海域受黄河1976年由刁口流路改道清水沟流路事件影响显著，这一时期沉积速率大幅减小并呈现阶段性特征；快速沉积时期表层沉积物频繁液化产生的砂层不断累积，从而形成密集砂层；通过分析²¹⁰Pb_ex、¹³⁷Cs活度剖面获得研究区液化历史的沉积记录，判定历史液化深度至少为5 m，这一结论与前人研究相近。以²¹⁰Pb、¹³⁷Cs的活度为工具来判断沉积物液化历史及深度存在一定的可行性，具有很大的发展潜力。
- 黄河水下三角洲 /
- 放射性核素 /
- 粒度特征 /
- 液化深度
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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图 1 研究区位置

Fig. 1 The location of study area

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图 2 沉积物粒度参数剖面

Fig. 2 Profiles of grain-size parameters

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图 3 沉积物剖面分层特征

Fig. 3 Profiles of layered characteristics

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图 4 ²¹⁰Pb_ex和¹³⁷Cs活度剖面

Fig. 4 Activity profile of ²¹⁰Pb_ex and ¹³⁷Cs

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图 5 利津站历年水沙量（改自文献[15]）

Fig. 5 Annual runoff and sediment load at Lijin Station (modified from reference [15])

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图 6 刁口河流路行水期间利津站输沙量统计

Fig. 6 Sediment discharge at Lijin Station during Diakou River flow

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图 7 密集砂层的形成过程

Fig. 7 Formation of dense sand layer

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图 8 浅地层剖面声学反射示意图（引自文献[26]）

Fig. 8 The stratigraphic characteristics of disturbed strata (according to exploration results of SES-2000) (refer to reference [26])

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