裂隙含水层水文地质参数反演——以黑龙江七台河市应急水源地为例

Application of numerical simulation to estimate the hydraulic parameters in fractured media:A case study in emergency water area of Qitaihe City,Heilongjiang Province

为了获取裂隙含水层水文地质参数,以黑龙江省七台河市应急水源地为例,在抽水试验和示踪试验基础上,利用数值模拟软件GMS(Groundwater Modeling System)建立地下水流数值模型和溶质运移模型。通过研究溶质运移单域模型和两区模型,发现在裂隙含水层中两区模型能更好的描述穿透曲线的拖尾现象。实例研究表明利用数值模拟方法反演的含水层参数与解析法结果很接近,数值模拟的水均衡误差为0.024%,参数可靠性较高。研究发现该地区裂隙连通性较好,可作为应急水源地。

In order to obtain the aquifer parameters in fractured media,we select the emergency water area of Qitaihe city in Heilongjiang Province as an example to estimate the aquifer parameters. Pumping test and tracer test have been conducted in three representative boreholes in this area. We establish flow model and solute transport model by GMS software to obtain the aquifer parameters after identifying these models.Besides,the results of fitting curve between the CDE model and the Mobile In-Mobile（ MIM） model indicate that the MIM model is better to capture the tailing of solute transport processes in fractured media. The results obtained from numerical simulation are close to that of the analytical method,and the error of water balance is only 0. 024%,which means the reliability of parameters is relatively high. It was found that the fractured connectivity of this area is very good,it can be used as an emergency water area.