Land subsidence and earth fissures due to groundwater withdrawal in the Southern Yangtse Delta,China |
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| Authors: | Yun Zhang Yu-Qun Xue Ji-Chun Wu Jun Yu Zi-Xin Wei Qin-Fen Li |
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| Institution: | (1) Department of Earth Sciences, Nanjing University, Nanjing, 210093, China;(2) Jiangsu Institute of Geological Survey, Nanjing, 210018, China;(3) Shanghai Institute of Geological Survey, Shanghai, 200072, China |
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| Abstract: | Excessive extraction of groundwater has caused severe land subsidence and earth fissures in the Southern Yangtse Delta, China.
Based on field data, the temporal and spatial distribution of land subsidence is investigated and the causes for earth fissures
are analyzed. The areal distribution of the land subsidence is closely related to the cones of depression in the main exploited
aquifers. The compaction of a hydrostratigraphic unit depends on its mechanical behavior, thickness, compressibility, and
the piezometric level changing. The primary subsidence layers in Shanghai have been the first aquitard before 1990 and the
third confined aquifer since then. But the second aquitard unit was the primary subsidence layer in Changzhou. Earth fissures,
trending in several directions, occurred in the Husu tectonic zone. They were mainly caused by differential subsidence and
horizontal displacement that resulted from tensile stress and shear stress in units. The majority of fissures in the study
area are tensile. |
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| Keywords: | Land subsidence Earth fissure Groundwater extraction Aquifer system compaction The Southern Yangtse Delta |
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