Numerical Simulation Study of Ecological Recharge Groundwater Based on Visual MODFLOW

地下水资源是重要的战略资源。面对地下水资源超采严重、水位持续下降的严峻形势，邯郸市自2018年起通过滏阳河河道开展生态补水工程，以加强地下水修复。本文以滏阳河流域邯郸段平原区为研究区，基于含水层的水文地质条件及结构特性，采用Visual MODFLOW构建地下水系统的数值模拟模型，并对模型参数进行率定和验证。为探究生态补水对地下水的影响，结合南水北调中线工程实际输水情况，设计六种方案进行模拟。综合考虑地下水位上升和河道渗漏量，方案五(非汛期集中补水9000万m³)效果最优，可使非汛期地下水位抬升0.68 m，为地下水资源管理提供依据。Groundwater resources are important strategic resources. Facing the severe situation of serious over-exploitation of groundwater resources and continuous decline of water level, Handan City has been carrying out ecological recharge projects through the river channel of the Busyang River since 2018 in order to strengthen groundwater restoration. In this paper, taking the plain area of Handan section of the Busyang River basin as the study area, based on the hydrogeological conditions and structural characteristics of the aquifer, Visual MODFLOW is used to construct a numerical simulation model of the groundwater system, and the model parameters are rate-set and verified. In order to investigate the impact of ecological recharge on groundwater, six scenarios are designed for simulation in combination with the actual water transfer situation of the South-to-North Water Diversion Middle Line Project. Considering the groundwater level rise and river leakage, Scheme 5 (90 million m3 of centralized water recharge during non-flood season) has the best effect, which can raise the groundwater level by 0.68 m during non-flood season, and provide a basis for groundwater resource management.