基于解析-数值结合法的傍河水源地开采方案与地下水资源量分析

合理设计开采方案对傍河水源地地下水资源开发和避免环境地质问题的发生具有重要意义。以承德市四道河典型傍河地下水水源地为研究区,在明确区域水文地质条件的前提下,建立地下水流数值模型,运用仿泰斯公式和映射叠加原理计算出合理的开采井布局,数值法与解析法相结合得到最优开采方案,确定水源地地下水可开采资源量。结果显示,在研究区4个区段内29眼开采井沿河流单排布设,井河距离为25 m,井间距离为150 m的方案为最优开采方案,水源地地下水可开采资源量为4.51万m³/d。滦河对地下水的补给充足而稳定,取水保证程度较高,对区域水环境影响较小。

An Analysis of the Exploitation Scheme and Groundwater Resources of a Well Field at the Riverside Based on the Combination of Analytical and Numerical Method

Reasonable design of exploitation scheme is of great significance to the exploitation of groundwater resources and the avoidance of environmental geological problems.The study area is located in Chengde,which is a typical region along a river.Based on the clear regional hydrogeological conditions,a numerical model of groundwater flow is established.The rational well layout is calculated on the basis of the formula and mapping superposition.The optimal exploitation scheme and the exploitable resources of groundwater are obtained by combining numerical and analytical method.The results show that 29 pumping wells is along the river in 4 regions with the distance between wells of 150 m.The distance between the wells and the river is 25 m and the allowable exploitation quantity is 4.53×10⁴m³/d.Luan River has not only sufficient and stable groundwater supply but also a higher guarantee degree of water intake.Meanwhile,this scheme has little impact on the regional water environment.