绿色屋顶与下凹式绿地串联对洪峰的削减效应分析  

Analysis of Peak Flow Reduction with Green Roof and Sunken Lawn Applied in Series

作　　者：马姗姗[1] 庄宝玉[2] 张新波[3,4] 彭森[1] 

机构地区：[1]天津大学环境科学与工程学院,天津300072 [2]天津市城市规划设计研究院,天津300201 [3]天津市水质科学与技术重点实验室,天津300384 [4]天津城建大学环境与市政工程学院,天津300384

出　　处：《中国给水排水》2014年第3期101-105,共5页China Water & Wastewater

基　　金：天津市科技创新专项资金(市长基金)资助项目(08FDZDSF03200);天津市水质科学与技术重点实验室开放研究基金资助项目

摘　　要：为考察绿色屋顶与下凹式绿地这两种低影响开发(LID)措施的雨洪控制效果,对二者的产汇流模型进行了研究,并采用InfoWorks CS软件建立了天津某大学生活区的雨水系统排洪模型,模拟分析了不同降雨频率、两种排洪模式下二者对城市雨洪的影响。结果表明:当屋面与绿地各自排洪(屋顶径流不接入绿地)时,将不透水平屋面改为绿色屋顶、平式绿地改为下凹式绿地后,洪峰流量的降低幅度高达41.1%,径流系数降低至0.279,降低幅度高达49.9%,峰现时刻有效延迟,显著降低了城市化开发对水文效应的影响;当绿色屋顶与下凹式绿地串联(绿色屋顶径流接入下凹式绿地)时,与二者各自排洪相比,削峰和滞留效果更加显著,且随着降雨频率的增大,串联的优势越加明显。可见,绿色屋顶与下凹式绿地串联使用能更大限度发挥这两种LID措施的削峰效应,实现低影响开发的目标。In order to investigate the effects of green roof and sunken lawn which are both low im- pact development （LID） measures on urban flood control, the runoff volume models and runoff routing models of them were studied. The InfoWorks CS was employed to build a stormwater system model for the living area of a university in Tianjin. Based on the model, the hydrological effects of green roof and sunk- en lawn were analyzed under different rainfall frequencies and different flood drainage ways. The results showed when the roof and the lawn discharged stormwater separately （ green roof runoff did not discharge into sunken lawn）, after the transformation of the impervious flat roof to green roof and transformation of flat lawn to sunken lawn, the peak flow decreased by up to 41.1%, the runoff coefficient reduced to 0. 279, decreasing by 49.9%. The peak time was delayed effectively, which significantly reduced the impact of urbanization on the hydrological effects. When green roof and sunken lawn were applied in se- ries （ green roof runoff discharged into sunken lawn）, compared with discharging stormwater separately, the peak flow reduction and retention effect were more significant, and with the increasing of rainfall fre- quency, the advantages of discharging stormwater in series were increasingly obvious. So green roof and sunken green in series can decrease the peak flow to a great extent.

关 键 词：低影响开发 绿色屋顶 下凹式绿地 InfoWorks CS 

分 类 号：TU992[建筑科学—市政工程]