Numerical simulation of land subsidence induced by groundwater overexploitation in Su-Xi-Chang area,China |
| |
Authors: | Ji-Chun Wu Xiao-Qing Shi Shu-Jun Ye Yu-Qun Xue Yun Zhang Jun Yu |
| |
Institution: | (1) Department of Hydrosciences, Nanjing University, 210093 Nanjing, China;(2) Department of Earth Sciences, Nanjing University, 210093 Nanjing, China;(3) Geological Survey of Jiangsu Province, 210018 Nanjing, China |
| |
Abstract: | Su-Xi-Chang area is one of the typical regions in China which suffers from severe land subsidence. Various field monitoring
records were integrated to study the characteristics and mechanisms of land subsidence in this region. The development of
the land subsidence in this region shows a tight spatial and temporal correlation with the groundwater pumping. Based on the
analysis of the field data, it is found that the deformation patterns of the hydrogeologic units are greatly related to the
hydrogeologic properties and groundwater level variations. Some have an elastic behavior, others may have an elastic–plastic
rheology. Hence, a 3D finite element numerical model considering the rheological properties of the soil was developed to simulate
the groundwater level and land subsidence. Both hydraulic conductivity and specific storage were expected to vary with the
porosity during the process of consolidation. Multiscale finite element method (MsFEM) was applied to solve the model during
the period from 1996 to 2004. After calibrating the model with the observed groundwater level and subsidence data, the parameters
of the multi-layers system were estimated. The calibrated model outputs fit reasonably well with the observed data. Consequently
the model can be applied to predict groundwater level and land subsidence in future pumping scenarios. The model predictive
results show that land subsidence rate can be controlled and even rebound may occur after the implementation of the groundwater
exploitation prohibition.
Electronic supplementary material The online version of this article (doi:) contains supplementary material, which is available to authorized users. |
| |
Keywords: | Land subsidence Numerical simulation Deformation features Su-Xi-Chang area |
本文献已被 SpringerLink 等数据库收录! |
|