暴雨对梁子湖水动力和水质的影响研究

为了分析在暴雨条件下,流域面源污染对梁子湖水质的影响,采用分布式流域面源污染模型,结合湖泊二维水动力水质模型,以暴雨产生的面源径流和污染负荷作为水动力水质模型的边界条件,构建了包含暴雨径流-面源模型与二维水动力水质模型的梁子湖水质模型体系。采用梁子湖水质的实测资料对模型进行了验证,其结果为面源模型的误差在15%以内,水质模型误差在20%以内,表明模型能模拟暴雨条件下面源径流和入湖污染物输入时湖泊水动力及水质的动态响应关系。以2010年7月11日暴雨过程为例,利用所建模型对暴雨前后梁子湖水质变化进行分析。模拟结果表明,水质受暴雨及污染物的冲击影响较大。

Study on impact of storm on hydrodynamic and water quality of Liangzi Lake

To study the influence of non-point source pollution on water quality of Liangzi Lake under the rainstorm condi-tions, by using distributed watershed non-point source pollution models combining with the two-dimensional hydrodynamic and water quality model of lakes, a water quality model system containing the storm runoff - nonpoint source model and two-dimen-sional hydrodynamic water quality model is developed, which takes the non-point runoff generated by storm and pollution load as boundary conditions. The water quality of Liangzi Lake before and after the storm was analyzed by the established model. The model was validated through measured water quality data and the results showed that the error of nonpoint source model and lake water quality model are less than 15% and 20% respectively, indicating that the model is an effective tool to simulate the dynam-ic response relationship between hydrodynamic and water quality of the lake under the rainstorm conditions. For the rainstorm process on July 11, 2010, the hydrodynamic and water quality response can be simulated and the results showed that the lake wa-ter quality was seriously impacted by the heavy rain and pollutants.