Simulation of a groundwater fall caused by geological discontinuities

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• 作者：Wenping Li (1) liwp@mail.cigem.gov.cn
  Zhenying Liu (2)
  Haipeng Guo (1) hpguo79@gmail.com
  Ning Li (3)
  Weidong Kang (4)
• 关键词：Groundwater fall – ; Fault – ; MODFLOW – ; Unsaturated zone – ; China
• 刊名：Hydrogeology Journal
• 出版年：2011
• 出版时间：September 2011
• 年：2011
• 卷：19
• 期：6
• 页码：1121-1133
• 全文大小：1.0 MB
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• 作者单位：1. China Institute of Geo-Environmental Monitoring, No. 20 Dahuisi Road, Haidian District, Beijing, 100081 PR China2. College of Engineering, Shijiazhuang University of Economics, Beijing, 050031 PR China3. Institute of Environmental Engineering (IfU), ETH Zurich, 8093 Switzerland4. Department of Geology, Northwest University, Xi鈥檃n, 710069 PR China
• 刊物类别：Earth and Environmental Science
• 刊物主题：Earth sciences
  Hydrogeology
  Geology
  Waste Water Technology, Water Pollution Control, Water Management and Aquatic Pollution
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1435-0157

文摘

In some areas close to a reverse fault with significant vertical displacement, or the boundary of a mining area in multi-layer rock and the boundary of perched water, the phreatic water-level changes abruptly from one side of the fault or boundary to the other. There is no direct hydraulic connection between the two sides and a groundwater fall occurs across the fault or boundary. This groundwater fall cannot be easily handled by the modules available in MODFLOW. Semi-analytical solutions were derived for water discharge from the upstream to the downstream side of the fault or boundary, and verified by air-water two-phase numerical simulation. The numerical results show that the derived semi-analytical solutions can be used to accurately estimate the groundwater flux at the fault even though the unsaturated zone is not considered. A module package, GWF, was developed to simulate the groundwater fall, which can be embedded directly into MODFLOW. A theoretical example is presented to show how the package GWF is used to simulate perched water. This package was also applied successfully to build a regional groundwater model of the Urumqi River Basin, Xinjiang, China, and the simulation results showed good agreement with the local hydrogeologic conditions.