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Coupling model of groundwater and land subsidence and simulation of emergency water supply in Ningbo urban Area, China
Journal of Hydrology ( IF 5.9 ) Pub Date : 2021-01-08 , DOI: 10.1016/j.jhydrol.2021.125956
Yu Zhao , Chaolin Wang , Jinqiang Yang , Jing Bi

Groundwater withdrawal has caused severe land subsidence in Ningbo since 1964. The land subsidence rate slowed down by the prohibition of groundwater exploitation. However, water supply crisis prompted a new task of how to satisfy the emergency demands of water supply. This study tries to provide insights into the prediction of groundwater level and land subsidence and formulate reasonable exploitation plans for emergency water supply in Ningbo urban area. A coupling model of groundwater and land subsidence was developed to quantify the subsidence caused by water withdrawal. The proposed model is recognized for the period 1989–1992 and is verified for the period 1992–1993 using observed groundwater and land subsidence records in Ningbo urban area. Based on the calibrated and evaluated model, six reasonable exploitation plans for emergency water supply in Ningbo urban area are formulated, and the dynamic prediction of groundwater level and land subsidence changes in each plan are made. Numerical results show that the pore confined water in Ningbo urban area has good supply conditions and strong water level recovery ability, which can meet the demand of short-term centralized water supply. A longer time of emergency water supply and a lower controlling depth of water level leads to larger subsidence. After the completion of water supply, areas near exploited well may appear subsidence rebound due to the recovery of groundwater level, but subsidence continues to increase in areas far away from the exploited well due to the delayed settlement of the lagging interbeds.



中文翻译:

宁波市区地下水与地面沉降耦合模型及应急供水模拟

自1964年以来,地下水的抽取已经在宁波造成了严重的地面沉降。由于禁止开采地下水,地面沉降的速率有所降低。然而,供水危机引发了一项新的任务,即如何满足供水的紧急需求。本研究旨在为宁波市地下水位和地面沉降的预测提供见解,并为宁波市区应急供水制定合理的开发计划。建立了地下水与地面沉降的耦合模型,以量化取水引起的沉降。该模型在1989-1992年期间得到认可,并在1992-1993年期间使用宁波市区的地下水和地面沉降记录进行了验证。根据经过校准和评估的模型,制定了六项合理的宁波市应急供水开发方案,并对每项方案的地下水位和地面沉降变化进行了动态预测。数值结果表明,宁波市区的孔隙承压水具有良好的供水条件和较强的水位回收能力,可以满足短期集中供水的需求。紧急供水时间较长,水位控制深度较低,导致下沉量增加。供水完成后,由于地下水位的恢复,开采井附近的区域可能会出现沉陷反弹,但是由于滞后夹层的延迟沉降,远离开采井的区域的沉陷继续增加。并对每个方案的地下水位和地面沉降变化进行了动态预测。数值结果表明,宁波市区的孔隙承压水具有良好的供水条件和较强的水位回收能力,可以满足短期集中供水的需求。紧急供水时间较长,水位控制深度较低,导致下沉量增加。供水完成后,由于地下水位的恢复,开采井附近的区域可能会出现沉陷反弹,但是由于滞后夹层的延迟沉降,远离开采井的区域的沉陷继续增加。并对每个方案的地下水位和地面沉降变化进行了动态预测。数值结果表明,宁波市区的孔隙承压水具有良好的供水条件和较强的水位回收能力,可以满足短期集中供水的需求。紧急供水时间较长,水位控制深度较低,导致下沉量增加。供水完成后,由于地下水位的恢复,开采井附近的区域可能会出现沉陷反弹,但是由于滞后夹层的延迟沉降,远离开采井的区域的沉陷继续增加。数值结果表明,宁波市区的孔隙承压水具有良好的供水条件和较强的水位回收能力,可以满足短期集中供水的需求。紧急供水时间较长,水位控制深度较低,导致下沉量增加。供水完成后,由于地下水位的恢复,开采井附近的区域可能会出现沉陷反弹,但是由于滞后夹层的延迟沉降,远离开采井的区域的沉陷继续增加。数值结果表明,宁波市区的孔隙承压水具有良好的供水条件和较强的水位回收能力,可以满足短期集中供水的需求。紧急供水时间较长,水位控制深度较低,导致下沉量增加。供水完成后,由于地下水位的恢复,开采井附近的区域可能会出现沉陷反弹,但是由于滞后夹层的延迟沉降,远离开采井的区域的沉陷继续增加。

更新日期:2021-01-18
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