LID改造对城市内涝与面源污染的影响

为了探究低影响开发(LID)措施对城市雨水-径流-污染过程的改善效果，以广州市某区域为例，提出了4种LID改造措施(绿色屋顶、生物滞留池、透水铺装、3种LID组合)，并构建了SWMM模型来模拟分析5种暴雨重现期下不同LID改造措施的水文水质效应。结果表明：单一LID改造措施下，暴雨重现期较大时透水铺装效果最好，该情景下洪峰削减率、峰现时间延迟和总流量削减率都达到了最大；3种LID组合对总流量削减率最高，为26-12%~34-40%；单一LID改造措施下，透水铺装对COD与NH3-N质量浓度峰值削减和峰现时间延迟效果最佳；3种LID组合对COD和NH3-N总量削减率最高，分别为50-51%~60-83%和53-16%~58-47%。LID改造措施对城市内涝、COD和NH3-N都有不同程度的减轻或削减，其中LID组合改造措施的效果最好。

Influence of LID adaptation on urban flooding and non-point source pollution

In order to explore the improvement effect of low-impact development(LID)measures on the urban rainwater-runoff-pollution process, we took an area in Guangzhou as the research object and proposed four LID reconstruction measures(green roof, bioretention cell, permeable pavement, combination of three LID), and the SWMM model was constructed to simulate and analyze the hydrological and water quality effects of the different LID reconstruction measures under the five rainstorm recurrence periods. The results show that: under the single LID, the permeable pavement effect is the best when the rainfall recurrence period is large. Under this scenario, the flood peak flow reduction rate, peak time delay and total flow reduction rate have reached the maximum; In addition, combination of three LID has the highest total flow reduction rate of 26. 12% ~ 34. 40%; Under a single LID, permeable pavement has the best effect on COD and NH₃-N concentration peak reduction and peak time delay; The combination of three LID have the highest reduction rates for COD and NH₃-N, Which is 50. 51%~ 60. 83% and 53. 16 %~ 58. 47%, respectively. The LID reconstruction measures have reduced urban flooding, COD and NH₃-N to varying degrees, and the combination of LID reconstruction measures has the best effect.