苏北沿海三市三维地下水流数值模拟

doi:10.13278/j.cnki.jjuese.20170028

Abstract

Abstract: Since 1980s, the over-exploitation of groundwater has caused a significant and persistent decline of water levels in some areas of the three coastal cities of north Jiangsu (Lianyungang, Yancheng, and Nantong), land subsidence, water salinization, and other issues. Based on the previous study and the boreholes and water level observation data from 2005 to 2013, the authors established a three dimensional heterogeneous anisotropic groundwater flow numerical model. It can truly calculate the evolution of groundwater flow field in this area after calibration and verification. The groundwater flow was simulated between 2005 and 2013, and the calculated results fitted the observation data well for every observation well. The simulation results of water level and water balance showed that the decreases of groundwater levels of every confined aquifer were effectively controlled through reducing the groundwater exploitation, although the groundwater in this area was still in the state of over exploitation. In consideration with the requirement of controlling geological environment disasters including salt water diffusion and land subsidence, the model predicted and compared the evolution of deep groundwater flow fields (including the confined aquifers Ⅱ, Ⅲ and Ⅳ) under two different exploitation strategies until 2020. The predictions revealed that the decreases in groundwater levels of every confined aquifer under two strategies were well controlled. Especially with the control exploitation strategy, the average decreasing rates of the confined aquifers Ⅱ, Ⅲ, Ⅳ were 0.15, 0.16 and 0.15 m/a respectively, which were reduced by 46.43%, 65.21% and 48.28% comparing with that in the simulated period in this study. The negative variation rate of storage volume under the lowest pumping intensity suggests that it is necessary to further reduce the exploitation of groundwater.

Key words: coastal north Jiangsu, multi-aquifers system, three dimensional numerical model, groundwater exploitation

CLC Number:

P641.2

Chen Xiong, Zhang Yan, Wang Yiwei, Ye Shujun, Wu Jichun, Yu Jun, Gong Xulong. Numerical Simulation of Three Dimensional Groundwater Flow in Three Coastal Cities of North Jiangsu[J].Journal of Jilin University(Earth Science Edition), 2018, 48(5): 1434-1450.

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