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以陕西省西咸新区沣西新城核心区西部排水区为研究对象,使用暴雨管理模型SWMM软件建立其雨洪模型,在3种降雨事件下模拟研究区排放口水量和水质变化过程,再分别添加雨水花园和渗渠措施,模拟在LID措施调控下的水量水质状况。结果表明:雨水花园和渗渠都对水量和污染物的峰值与总量有较好的削减效果,但削减率都随着降雨强度的增大而减小,其中降雨强度对雨水花园的影响较明显。在相同重现期下,雨水花园对水量和水质的总量的削减效果较渗渠要好,而渗渠对水量和水质的峰值的削减效果则优于雨水花园。综合考虑两个LID措施的处理特点,建议在新区后期建设中结合使用,以控制和改善由降雨产生的径流和污染物问题。
Taking the drainage area in the western core of Xixian New District in Shaanxi Province as the research object, the rainstorm model was established by storm management model SWMM software, and the discharge water quantity and water quality change process were simulated under three kinds of rainfall events, and then added separately Rainwater garden and seepage canal measures to simulate the water quality under the control of LID measures. The results showed that both the rainwater garden and the seepage canal had a good effect on reducing the peak and the total amount of water and pollutants, but the reduction rate all decreased with the increase of rainfall intensity. The impact of rainfall intensity on the rainwater garden obvious. In the same period of return, the rainwater garden is better than the seepage channel in reducing the total amount of water and water quality, while the seepage channel is better than the rainwater garden in reducing the peak of water and water quality. Considering the processing characteristics of the two LID measures, it is suggested that they be used in combination with the latter part of the new district to control and improve the runoff and pollutants caused by rainfall.