摘要
地下水人工回灌是恢复地下水位和控制地面沉降的重要方法。为实现减小地下水开采漏斗影响范围、消除地面沉降严重区的目标,本文通过建立天津市某地面沉降严重区深部含水组地下水流数值模型,模拟不同采灌方案,结合地下水水位抬升、地面沉降控制程度等因素,综合评价天津市深层地下水人工回灌效果,研究结果表明:(1)地下水人工回灌对深部含水层地下水位恢复和地面沉降减缓起到十分显著的效果,地下水开采量逐步压缩至零开采并结合地下水回灌是适宜天津市深层地下水位修复和控制地面沉降的最优采灌方案;(2)据文中方案R-4计算结果显示,地下水压缩开采至零对地面沉降的控制效果占控沉整体效果的84.5%,约为地下水回灌对地面沉降控制效果的5倍;(3)为尽快实现消除地面沉降峰值的目标,建议于天津市平原区年沉降量大于50 mm的沉降严重区优先开展地下水人工回灌,选择沉降严重区内部的地下水漏斗中心作为回灌靶区实地开展地下水人工回灌试验工程,填补天津市深层地下水人工回灌技术研究的空白。
Artificial recharge of groundwater is an important method to restore groundwater level and control land subsidence.In order to achieve the goal of reducing the influence area of of the groundwater mining funnel and eliminating areas with serious land subsidence,this paper establishes a numerical model of groundwater flow in a deep water-bearing group in a severe land subsidence area in Tianjin,simulates different irrigation and extraction schemes,and combines factors such as groundwater level rise and land subsidence control degree to comprehensively evaluate the effect of artificial recharge of deep groundwater in Tianjin.The research results show that:(1)The artificial recharge of groundwater has a very significant effect on the restoration of the deep aquifer groundwater level and the reduction of land subsidence.The gradual reduction of groundwater extraction to zero and combined with groundwater recharge is the most suitable solutionfor deep groundwater level restoration and land subsidence control in Tianjin;(2)According to the calculation results of scheme R-4 in the article,the groundwater compression mining to zero has a control effect on land subsidence accounting for 84.5%of the overall subsidence control effect,which is about 5 times of the control effect of groundwater recharge on land subsidence;(3)In order to achieve the goal of eliminating the peak of land subsidence as soon as possible,it is recommended to give priority to groundwater artificial recharge in areas with severe subsidence greater than 50 mm of Tianjin,and choose the center of the groundwater funnel in the area with severe subsidence as the recharge target area to carry out the groundwater artificial recharge test project to fill the gaps in the research on artificial recharge technology of deep groundwater in Tianjin.
作者
徐佳
李佳琦
闫伟
苑崴
路旭
顾立军
XU Jia;LI Jia-qi;YAN Wei;YUAN Wei;LU Xu;GU Li-jun(Tianjin Geological Affairs Centre,Tianjin 300040;Tianjin Municipal Surveying and Mapping Institute Co.,Ltd,Tianjin 300381)
出处
《地下水》
2024年第3期74-76,92,共4页
Ground water
关键词
地下水人工回灌
地面沉降
深层地下水
数值模拟
地下水位
沉降严重区
artificial recharge of groundwater
land subsidence
deep groundwater
numerical simulation
groundwater level
severe subsidence area
