Background of the South-North Water Transfer Project: Response and regulating factors of groundwater recharge to surface deformation in the middle and upper regions of the Chaobai River alluvial fan
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Beijing Institute of geo-environment monitoring

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    Abstract:

    Continuous groundwater recharge was crucial in preventing and reducing the development of land subsidence once southern water entered Beijing in 2014. However, it is still unclear how groundwater rebound and its governing elements produce ground sinking and rebound in various places and strata. Understanding the mechanism of surface deformation, identifying the primary limiting factors for future scientific replenishment, maximizing the benefits of water resource replenishment, preventing land subsidence, and managing overexploited areas are all very important. Deep exploration and study of these relationships is also very important. This paper uses persistent scatterer interferometric synthetic aperture radar (PS-InSAR) technology, along with regional stratified groundwater level dynamic change, stratified settlement change, and other means to carry out coupling, to obtain information on ground subsidence and deformation in the study area. The intention is to determine which response and control factors between the surface and subsurface processes. The findings indicate that (1) the region"s land subsidence is slowed down by the south water"s constant replenishment, and that the Niulan Mountain region experiences surface uplift. With the rise in water level, the uplift area also gradually widens to the middle and downstream, and the maximum rebound rate reaches 46.9mm/a in 2022. (2) The Houshayu depression, which is split by the Huangzhuang-Gorliying fault, Shunyi fault, and Nankou-Sunhe fault, has undergone more alterations than other regions because for any particular characteristics of Quaternary depositional differences governed by faults. (3) The range and responsiveness of water level rise are determined by variability in groundwater level amplitude and water richness, and the direction of groundwater flow is somewhat controlled by quaternary sedimentary differences brought on by sedimentary tectonics. The findings also offer a theoretical and scientific foundation for study on mechanisms, prevention, and control of land subsidence, as well as direction and a point of reference for groundwater cleanup and program optimization that will come later.

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History
  • Received:May 26,2023
  • Revised:September 18,2023
  • Adopted:February 19,2024
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