基于SWMM的济南韩仓河流域宏观LID实践模拟

Simulation of Macro LID Practice in Hangcang River of Jinan Based on SWMM

以济南市韩仓河流域为例,运用SWMM模型模拟分析不同降雨强度、不同雨峰系数条件下,流域宏观LID措施对流域水文和水质的控制效果。结果表明,随着降雨重现期P值的增大,流域雨水湿地体系规划方案对流域平均流量、峰值流量、污染物负荷的削减效果逐渐减弱。在降雨重现期相同条件下,雨峰位置系数较小(r=0.4)时,流域污染物负荷更少,峰值流量减少率更高,河道径流峰值延迟效果更好,但污染物的削减率不受单次降雨的雨峰系数影响。

Taking Hancang River watershed in Jinan City as an example, SWMM model is used to simulate the effect of macro-scale LID measures on hydrology and water quality of the basin under different rainfall intensities and different rainfall peak positions. The results show that with the increase in repetition period of rainfall, the effect of planning scheme of rainwater wetland system on the reduction of average discharge, peak discharge and pollutant load in the basin is gradually weakened. Under the same conditions of repetition period of rainfall, when the rainfall peak coefficient is small(r=0.4), the pollutant load is less, the peak discharge reduction rate is higher, and the delayed effect of the peak runoff is better, but the pollutant reduction rate is not affected by the single rainfall peak coefficient.