摘要
根据宁河北岩溶地下水源地已有的水文地质勘查成果和大型抽水试验资料,对研究区水文地质条件进行概化,建立地下水流三维非稳定流数学模型并进行数值计算,对开采性抽水试验的地下水位变化过程进行模拟。结果表明,该模型可以刻画埋藏型水源地地下水流场的变化过程,用它对规划的水源地三种开采方案的开采动态进行预测计算也取得了良好的效果。模拟计算中将开采条件下浅层第四系含水层对深层奥陶系灰岩含水层的越流补给处理为边界条件,可以刻画埋藏型水源地在开采条件下获得的补给增量。
Groundwater is proposed being produced from the Ordovician carbonate aquifer at the Ninghebei wellhead. The depth of the Ordovician aquifer, occurring in a syncline, is 200 m or more. Only in the northeastern part of the syncline is the Ordovician aquifer overlaid by the Quaternary sediments. Based on current data of investigations and a large pumping test on the wellhead, the hydrogeologic conditions in the study area are simplified and a 3-D unsteady numerical model of the groundwater flow is constructed by simulation of the changes in water tables during the pumping test. The research results indicate that the developed model may be used to describe the changes in groundwater flow field in buried karst wellhead and satisfactory results can be obtained when the model is used to predict the exploitation regimes of three proposed production schemes for the wellhead. Leakage from the upper Quaternary aquifer to the deep Ordovician aquifer under exploiting condition is treated as a boundary condition in the model, indicating that the model can describe the increase in recharge in buried karst wellhead under exploiting condition.
出处
《中国岩溶》
CAS
CSCD
北大核心
2006年第1期6-11,共6页
Carsologica Sinica
基金
天津市计委和天津市水利局建设项目--天津市宁河北地下水源地应急开发工程(2002123)
关键词
数值模拟
三维流动
水源地
奥陶系灰岩
Numerical modeling
3-D flow
Wellhead
The Ordovician carbonate
