南水北调背景下地下水回补对潮白河冲洪积扇中上部地表形变响应及控制因素
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北京市地质环境监测所

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北京市科技计划课题(编号:Z191100001419007)、(编号: Z231100003823006)和北京市财政项目(11000022T000000440128)


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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    摘要:

    2014年南水进京后,持续开展地下水回补对于遏制和减缓地面沉降发展起到重要作用,但地下水回升由此带来的不同区域、不同层位的地面沉降与回弹机制及其控制因素尚不明确。深入探讨和研究回补时间、回补量、回补地点与水位及地表形变之间的关系,了解地表形变发生机理和识别主控因素,为后续如何科学回补,发挥最大化水资源回补效益、对地面沉降防治和超采区治理具有极其重要意义。本文以潮白河冲洪积扇中上部区域为例,采用永久散射体差分干涉测量(PS-InSAR)技术获取研究区地面沉降形变信息,并结合区域分层地下水位动态变化、分层沉降变化等多手段进行耦合,查明研究区地表形变与多因素之间的响应与控制因素。结果表明(1)南水持续回补导致区域地面沉降减缓,并在牛栏山地区出现地表抬升,抬升范围也随着水位上升逐渐向中下游扩展,2022年最大回弹速率达46.9 mm/a。(2)地表形变具有明显的受断裂所控制的第四系沉积差异特性,以黄庄-高丽营断裂、顺义断裂和南口-孙河断裂所分割的后沙峪凹陷范围内变化明显大于其他地区。(3)地下水位变幅与富水性差异决定水位上升范围与响应变化,而沉积构造作用所造成第四系沉积差异在地下水流向上具有一定控制作用。结果也为地面沉降防控和机理研究提供理论和科学依据,同时也为后续开展地下水科学回补和方案优化提供指导和借鉴。

    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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  • 收稿日期:2023-05-26
  • 最后修改日期:2023-09-18
  • 录用日期:2024-02-19
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