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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
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Lu Sun1, Hongxian Shan1, 2, Hong Zhang1, 3, Hanlu Liu1, Yonggang Jia1, 2, *
Haiyang Xuebao | 2023, 45(10) : 105 - 113
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Haiyang Xuebao | 2023, 45(10): 105-113
• Article •
Determination of sediment liquefaction depth based on 210Pb, 137Cs distribution and grain-size characteristic: Take the Chengdao sea area as an example
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Lu Sun1, Hongxian Shan1, 2, Hong Zhang1, 3, Hanlu Liu1, Yonggang Jia1, 2, *
Affiliations
  • 1Shandong Provincial Key Laboratory of Marine Environment and Geological Engineering, Ocean University of China, Qingdao 266100, China
  • 2Laboratory for Marine Geology, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266061, China
  • 3College of Engineering, Ocean University of China, Qingdao 266100, China
Published: 2023-10-01 doi: 10.12284/hyxb2023091
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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 210Pbex 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
Lu Sun, Hongxian Shan, Hong Zhang, Hanlu Liu, Yonggang Jia. 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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Year 2023 volume 45 Issue 10
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Article Info
doi: 10.12284/hyxb2023091
  • Receive Date：2022-10-25
  • Online Date：2025-12-28
  • Published：2023-10-01
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History
  • Received：2022-10-25
  • Revised：2022-12-10
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Affiliations
    1Shandong Provincial Key Laboratory of Marine Environment and Geological Engineering, Ocean University of China, Qingdao 266100, China
    2Laboratory for Marine Geology, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266061, China
    3College of Engineering, Ocean University of China, Qingdao 266100, China
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表12种不同金属材料的力学参数
科
Family		 属数
Number of
genus		 种数
Number of
species		 占总种数比例
Percentage of
total species (%)		 属
Genus		 种数
Number of
species		 占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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