Development and application of a regional land subsidence model for the plain of Tianjin

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• 作者：Yali Cui (1)
  Chen Su (1) (2)
  Jingli Shao (1)
  Yabin Wang (3)
  Xiaoyuan Cao (1)
  
• 关键词：groundwater ; land subsidence ; simulation ; modflow ; SUB ; the south ; to ; north water diversion
• 刊名：Journal of Earth Science
• 出版年：2014
• 出版时间：June 2014
• 年：2014
• 卷：25
• 期：3
• 页码：550-562
• 全文大小：
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• 作者单位：Yali Cui (1)
  Chen Su (1) (2)
  Jingli Shao (1)
  Yabin Wang (3)
  Xiaoyuan Cao (1)
  
  1. School of Water Resources and Environment, China University of Geosciences, Beijing, 100083, China
  2. Institute of Hydrogeology and Environmental Geology, Chinese Academy of Geological Sciences, Shijiazhuang, 050061, China
  3. Tianjin Institute of Geological Survey, Tianjin, 300191, China
  
• ISSN：1867-111X

文摘

In this paper, a coupled numerical groundwater and land subsidence model was developed for the Tianjin Plain. The model was employed to investigate the groundwater resources and their changes over the last decade, and to further predict the changing patterns of the groundwater level and associated land subsidence in future. First, according to the regional hydrogeology, the simulation area was defined with an area of 10.6×103 km2, which was divided into six aquifer units. A coupled groundwater and land subsidence numerical model was built by using Modflow2005 and the land subsidence simulation module SUB (subsidence and aquifer-system compaction), in which the groundwater flow was modeled as three-dimensional unsteady flow and the land subsidence simulation was based on one-dimensional consolidation theory. The model was then calibrated by using the groundwater level contour lines, hydrographs, and land subsidence hydrographs over the period of 1998-008. In addition, groundwater balance analysis of the simulation period indicated that under multi-year groundwater withdrawal condition the cross-flow recharge, compression release, and lateral boundary inflow contributed 44.43%, 32.14%, and 21.88% to the deep aquifer recharge, respectively. Finally, the model was applied to predict the changing patterns of the groundwater levels and the associated variations in land subsidence under the control of groundwater exploitation after implementation of the south-to-north water diversion project. The simulation results demonstrated that the groundwater level may gradually increase year by year with an decrease in the groundwater withdrawal; and the land in dominated land subsidence regions including the urban area, Dagang, Hangu, Jinghai, Wuqing, and Jinnan, may rebound at an average rate of 2- mm/a, and the land subsidence rate in the other regions may decrease.