给定井内水头条件下含水层补给井数值模拟方法

为合理模拟给定井内水头条件下地下水人工补给井补给过程,在地下水流数值模拟有限差法程序中加入Thiem公式校正。通过理想算例分析了含水层渗透系数、给水度、地下水埋深及数值模型时空离散尺度对补给井流量计算精度的影响,经实例分析探讨该方法的应用效果。结果表明,给水度、渗透系数等水文地质参数变化对模拟计算结果影响明显,与给定补给流量的传统模拟方法相比,Thiem公式修正法考虑了水头变化对补给量的影响,合理模拟了补给量的动态变化过程。研究成果为模拟补给量的动态变化过程提供了一种方法,为深入分析水文地质参数非均质性对计算结果的影响奠定了基础。

Numerical Simulation Method of Groundwater Artificial Recharge Well under Given Head Boundary

For the purpose of artificial recharge well simulation under given head boundary, Thiem formula was coupled into groundwater finite definite model. Compared numerical and analytical solution, the model accuracy has been verified under different time-space discrete size and hydrogeology parameters, such as hydraulic conductivity, specific yield and ground water depth. Then the model was applied in a field area to access the simulation accuracy. As a result, the model is sensitive to hydrogeology parameters. Compared with traditional given flux-boundary model, groundwater finite definite model coupled with Thiem formula can simulate recharge flow dynamic more accurately. This paper provides a new method to simulate the dynamic variation process of groundwater recharge and lays a foundation to deep analyze the influence of hydrogeology parameter heterogeneity.