LID措施对城南河流域水质改善效果研究

Study on effect of LID measures on water quality improvementof Chengnan River Basin

为研究LID措施对水质的改善效果,并分析影响LID措施改善水质的因素,以南京市城南河流域为例,根据现有下垫面资料对各汇水分区布设合理的LID措施,构建SWMM模型,模拟2年一遇降雨和5年一遇降雨条件下LID措施对城南河流域水质的改善效果。结果表明,LID措施能显著提升水质、削减污染物浓度,污染物削减率随降雨重现期、现状污染物浓度的提高而提升。

In order to study the effect of LID measures on water quality improvement and analyze the factors affecting LID measures to improve water quality,taking Chengnan River Basin in Nanjing as an example,according to the existing underlying surface data,reasonable LID measures were arranged for each catchment area,and SWMM model was constructed to simulate the improvement effect of LID measures on water quality of Chengnan River Basin under the conditions of 2-year and 5-year return period rainfall.The results showed that LID measures could significantly improve water quality and reduce pollutant concentration.The pollutant reduction rate increased with the increase of rainfall return period and current pollutant concentration.