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LIU Jie,LI Ping,LIU Xiao,XU Yuanqin,GAO Wei. 2015. The characteristics of consolidation settlement and its contribution to the topographical change in the northern modern Huanghe River subaqueous delta in China. Acta Oceanologica Sinica, 34(9):136-142
The characteristics of consolidation settlement and its contribution to the topographical change in the northern modern Huanghe River subaqueous delta in China
现代黄河水下三角洲北部土体固结沉降特征及其对地形变化的贡献研究
Received:October 29, 2014  Revised:January 22, 2015
DOI:10.1007/s13131-015-0732-6
Key words:sediment consolidation  water depth variation  morphological effect  core analysis  northern Huanghe River subaqueous delta
中文关键词:  固结沉降  水深变化  地形影响  钻孔分析  现代黄河水下三角洲北部
基金项目:
Author NameAffiliationE-mail
LIU Jie First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China  
LI Ping First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China liping@fio.org.cn 
LIU Xiao College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, China  
XU Yuanqin First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China  
GAO Wei First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China  
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Abstract:
      The sediments of the modern Huanghe River subaqueous delta are easily to generate settlement and lead to topography change which is due to fast deposition rate, high void ratio, moisture content and compressibility. The sediment consolidation settlements and its contribution to the topography change in the northern modern Huanghe River subaqueous delta are studied based on drilling data, laboratory experiment results, and water depth measurements of different time. The results show that the final consolidation settlement of drill holes in the study area is between 1.17 and 3.21 m, and mean settlement of unit depth is between 2.30 and 5.30 cm/m based on the one-dimensional consolidation theory and Plaxis numerical model. The final consolidation settlement obtained by Plaxis numerical model is smaller than that obtained by the one-dimensional consolidation theory, and the difference is 3.4%-39.9% between the methods. The contribution of the consolidation settlement to the topographical change is at 20.2%-86.6%, and the study area can be divided into five different regions based on different contribution rates. In the erosion area, the actual erosion depth caused by hydrodynamics is lower than the changes of measured water depth, however, the actual deposition amount caused by hydrodynamics is much larger than the changes of water depth obtained by measured data in the equilibrium and deposition areas.
中文摘要:
      现代黄河水下三角洲沉积速度快,具有高孔隙比、高含水率、高压缩性等特点,极易因固结压缩而产生沉降,从而导致地形变化。本文根据研究区实际钻孔资料及不同时期的实测水深变化数据,利用太沙基一维固结理论和Plaxis数值模型计算了黄河三角洲土体的固结沉降量,对比该海域实测水深地形变化特征,定量计算了固结沉降对黄河水下三角洲地形变化的贡献率。结果表明:各钻孔的最终固结沉降量在1.17-3.21 m之间,单位深度土体的固结沉降量在2.30-5.30 cm/m之间,太沙基一维固结理论计算值略大于Plaxis数值模拟结果。研究区土体固结沉降对水下三角洲水深地形变化的贡献率在20.2~86.6%之间,根据贡献率的不同,可以将研究区分为5个不同的区域:实测水深冲刷中心和冲刷区内,实际水动力作用下的冲刷强度低于实测水深的变化值;实测水深冲淤平衡区和淤积区内,水动力作用下的实际淤积量远大于实测水深变化值。
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