低影响开发小区降雨径流的滞留与滞后效应

1.北京大学深圳研究生院环境与能源学院,城市人居环境科学与技术重点实验室,广东深圳518055;2.广州市城市规划勘测设计研究院,广东广州,510060

城市雨水;海绵城市;低影响开发;径流;滞留效应;滞后效应

Retention and lag effects of rainfall runoff in a low impact development area
YIN Yixiang1,QIN Huapeng1,YU Shuqi1,ZHENG Yanyan2,HE Kangmao1

1.School of Environment and Energy, Key Laboratory for Urban Habitat Environmental Science and Technology, Peking University Shenzhen Graduate School, Shenzhen 518055, Guangdong Province, P. R. China;2.Guangzhou Urban Planning Design Survey Research Institute, Guangzhou 510060, Guangdong Province, P. R. China

urban rainwater; sponge city; low impact development; rainfall runoff; retention effect; lag effect

DOI: 10.3724/SP.J.1249.2022.02142

备注

为解决海绵城市建设中低影响开发(lowimpactdevelopment,LID)小区降雨径流滞后效应量化研究不足的问题,基于中国深圳市麻磡环保产业园内3种LID组合设施(停车场-雨水花园、屋面-高位生物滞留池-渗透铺装-植被草沟、屋面-高位生物滞留池-渗透铺装-植被草沟-雨水花园)的降雨径流连续观测数据,系统评估了LID对径流的滞留和滞后效应,分析了LID设施组合和降雨特征等对滞留和滞后效应的影响.结果表明,LID可滞留75.0%~86.5%的降雨量,且在累计滞留降雨量达到2.2~9.9mm后才开始产流;相对于降雨过程,LID产流的结束时间、质心位置和峰值位置分别滞后100~115、30~68和13~34min;LID设施的串联有助于提高径流滞后效应;随着雨前干旱时间延长,LID开始产流时对应的累计雨量增加;随着降雨量或降雨历时的增加,产流停止时间和质心位置的滞后效应增强;而降雨强度越小、峰值越靠前,峰值位置的滞后效应越强.研究结果有助于提高LID对降雨径流滞后效应的认识.
In view of the insufficient quantitative analysis of lag effect of rainfall runoff in low impact development (LID) areas in the construction of sponge city, we evaluate the retention and lag effects of runoff of three combinations of LID facilities including Parking lot-Rain garden, Roof-Elevated bioretention-Permeable pavement-Grass ditch, Roof-Elevated bioretention-Permeable pavement-Grass ditch-Rain garden in Shenzhen Makan Environmental Protection Industrial Park based on the observation data in 190 rainfall events, and comprehensively analyze the influences of rainfall characteristics and combination of LID facilities on the effects. The results show that LID facilities can retain 75.0%-86.5% of rainfall, and LID can retain 2.2-9.9 mm of accumulated rainfall before runoff generation. Compared with the rainfall process, the end time, centroid position and peak position of runoff in LID combinations lag 100-115 min, 30-68 min and 13-34 min, respectively. The series connection of LID facilities can help to improve the lag effect of runoff. With the increase of drought time before rain, the LID combinations accumulate more rainfall before yielding runoff. With the increase of rainfall amount or rainfall duration, the lag effects of runoff end and centroid position increase. While the lag effect of peak position increases with the decrease of rainfall intensity and the advance of rainfall peak. The results are helpful to strengthen the understanding of the lag effect of LID on rainfall runoff.
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