应急水源地运行期间地下水位变化及环境影响评价

Groundwater Level Change of Emergency Water Source Site during Operation Period and Environmental Impact Assessment

基于江苏省南通市通州区水文地质条件,构建了该地区的水文地质概念模型,采用地下水模拟软件FEFLOW建立了地下水三维数值模型并对其进行验证。应急水源地运行期设为7 d,在承压含水层中抽水,对应急供水期间的水位下降以及停止抽水后水位恢复情况进行了模拟预测。结果表明,抽水期间所形成的水位降落漏斗的影响范围不超过1 km,最大降深约49 m;应急水源地运行期间形成的水位降落漏斗在停止抽水后能快速恢复,应急水源地的运行对周边地下水环境没有影响。

Based on the hydrogeological conditions of Tongzhou District,Nantong City,Jiangsu Province,the conceptual model of hydrogeology for this area is constructed,and a three-dimensional numerical model of groundwater is established by using the groundwater simulation software FEFLOW to verify the conceptual model.The operation period of the emergency water source site is set to 7 days,and the water is pumped in the confined aquifer.The water level drop during emergency water supply and the water level recovery after stopping pumping are simulated and predicted.The results show that the impact range of the water level drop funnel formed during pumping does not exceed 1 km and the maximum drop depth is about 49 m,the water level drop funnel formed during the operation of the emergency water source site can recover quickly after stopping pumping,so the operation of emergency water source site has no impact on surrounding groundwater environment.