LID设施布局对城市径流与污染负荷影响评估OA北大核心CSTPCD

In view of the lack of studies on the impact of low impact development(LID)spatial layout on the con-trol effect of water quantity and quality,Zhongyuan District of Zhengzhou City as a target area,its urban water quantity and quality model with LID facilities was built based on SWMM model principle.Based on the empirical value of urban comprehensive runoff coefficient and the actual situation of the area,Zhongyuan District was divided into high,medium and low-density areas of urban buildings,and different proportions of LID(S1-S5)were de-ployed in the high,medium and low-density urban areas,and the control effect of different spatial patterns of LID facilities on water quantity and quality under different rainfall levels was calculated.The results showed that with the increase of rainfall level,the total runoff reduction rate,peak flow reduction rate and TSS load reduction rate of LID scheme continued to decrease.When rainfall levels were rainstorm,heavy rain and moderate rain,LID scheme(S5)with a proportion of 35%,35%and 30%were deployed in high,medium and low dense urban areas,and the total runoff reduction rate exceeded 80%,the peak flow reduction rate exceeded 70%,and the TSS load reduc-tion rate exceeded 50%.From the comprehensive index evaluation of water quantity and water quality in each e-vent,the program had the best performance.