Land subsidence in China |
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Authors: | Yu-Qun Xue Yun Zhang Shu-Jun Ye Ji-Chun Wu Qin-Fen Li |
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Institution: | (1) Department of Earth Sciences, Nanjing University, Nanjing, China;(2) Shanghai Institute of Geological Survey, Shanghai, China |
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Abstract: | Land subsidence in China occurs in different regions. It is primarily caused by excessive groundwater withdrawal. Other reasons
for the subsidence include the oil, warm groundwater withdrawal and the neotectonic movement. The common characteristics of
land subsidence in China are slow, accumulative, irreversible, and other unique properties. The range of subsidence still
keeps extending and the accumulative subsidence increasing though some measures taken. Adjustment of the aquifer exploitation
practice is a subsidiary way to control land subsidence, but it cannot solve this problem completely. In a specfic way of
groundwater changing, the contribution of a certain soil layer to the total subsidence depends on its compressibility and
thickness. Besides the elasticity, both cohesive soil layers (aquitards) and sand layers (aquifers) are observed to be plastic
and creep when the groundwater level fluctuates in a specific way, which often leads to subsidence delay. |
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Keywords: | Land subsidence Earth fissure Excessive groundwater withdrawal China |
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