泉域地下水数值模拟及泉流量动态变化预测

Numerical modeling of groundwater in a spring catchment and prediction of variations in the spring discharge

本文对位于岩溶地区的小南海泉泉域地下水进行了数值模拟和水平衡分析,全面分析了降雨、河、渠、库地表水系入渗对地下水动态变化的影响,模拟了泉流量动态变化与区域地下水关系。在此基础上,分析了不同气候条件和开采方案对泉流量的影响。模型计算结果表明,小南海泉流量多年平均相对变化率与降雨量多年平均变化率基本一致,减少泉域地下水开采量,特别是矿坑排水可有效地增加枯期泉流量。

Variations in spring discharge are closely related to the rise and decline in groundwater tables, which depend on rainfall, groundwater withdrawal, irrigated water from canals, reservoir water storage, etc. Based on numerical modeling of groundwater and water balance analysis in the Xiaonanhai spring catchment in the karst region, variations in groundwater tables and spring discharges are simulated and their influences of recharge from precipitation, irrigation water and reservoir water storage are revealed. Variations in spring discharge due to climatic changes and groundwater withdrawal are quantitatively analyzed by the numerical model. The resuhs demonstrate that the relative changes in annual mean spring discharge are close to changes in precipitation. Reducing groundwater withdrawal, especially in the the spring discharges discharges in northern in drought periods China. mining area near the Xiaonanhai spring This study is important for protection of outlet, will significantly increase groundwater resources and spring