朝阳市建人工湖对地下水动力场影响及湖底铺设方案选择

朝阳市拟在城区段大凌河上兴建2个人工湖。本文利用地下水模型系统(Groundwater Modeling System，以下简称GMS)建立了地下水流动的数值模型，模拟了人工湖建成后在各种湖底渗透系数下地下水动力场的变化情况，并提出了人工湖湖底铺设应选取的合理有效的渗透系数为0．0432m/d。在此基础上，考虑到朝阳市经济社会的进一步发展对水资源量的需求，选取了采用聚氯乙烯膜(土工布)铺设湖底并预留原河道两侧占总湖底50％的面积以补给地下水的铺设方案作为最优方案，并在现有开采量的基础上增加了19600m^3／d的开采量。

Influence of the artificial lake construction on groundwater dynamic field near Chaoyang and laying scheme choice of the lake bottom

Two artificial lakes will be built in the city of Chaoyang by blocking the Daling River. The software Groundwater Modeling System was used to establish the numerical model of groundwater flow. The change in groundwater dynamic field under the condition of different hydraulic conductivities of the lake bottom can be simulated with the model. As a result, the reasonable and effective value of hydraulic conductivity, 0.0432m/d, was obtained. Considering the demand of water resources for the further development of society and economy of the city, the best scheme to lay the bottom of the artificial lakes is that the river course and its two sides, whose area accounts for 50% of the total lake bottom, are set aside to supply the groundwater, and the reminding area is covered by the PVC membrane. With this scheme, the present mining yield of groundwater will increase by 19?600 m~3/d.