基于地表水与地下水耦合模型的溪泉湖湿地数值模拟的应用研究

通过建立溪泉湖水源地地表水与地下水联合运用的耦合模型,借助于QUAL2K软件计算地表河流控制断面的入水浓度.采用MT3D模型,基于Visual MODFLOW有限差技术,分析了沈阳市沈北新区溪泉湖湿地构建储备水源地10 a后地下水环境的动态变化.水位模拟结果显示:2020年构建储备水源地处形成漏斗,水源地构建后的地下水水位降落漏斗处地下水等水位线比构建前下降2.5 m,与2009年初始水位相比大幅度下降,既满足水源地供水效益,又解决了周边水库蓄水造成的浸没问题.水质模拟结果显示:周边水库地下水水质较好,没有对水源地水质造成影响,但辽河支流的水质不容乐观,对水源地水质造成严重威胁.因此,为保障水源地水质安全,对溪泉湖地表水体进行污染防治势在必行.

Application of Numerical Simulation on the Xiquan Lake Wetland Based on Surface Water and Groundwater Coupling Model

By building the coupling model for conjunctive use of surface water and groundwater of Xiquan Lake water source, the surface water concentration was discussed by using the QUAL2K consequence. Based on the finite difference technique and MT3D model of Visual MODFLOW, dynamic changes in ten years later on the groundwater environment of Xiquan Lake wetland in Shenbei Area, Shenyang province were analyzed. Water level simulation results show that reserved water source will form a funnel in 2020 and the contour of groundwater level will decline 2. 5 m, having a great decline compared with 2009. Not only meeting the benefits of water supply source, but also solving the water immersion problems caused by the reservoir surrounding impoundment. Water quality simulation results show that reservoir surrounding groundwater quality is good, and there is no impact on water source quality. However, the water quality in Liao River tributary is not optimistic, taking a serious threat to water source quality. To ensure the water quality security of water source, it is imperative to treat the Xiquan Lake surface water pollution.