The capacity of greening roof to reduce stormwater runoff and pollution
The capacity of greening roof to reduce stormwater runoff and pollution
复制标题
屋顶绿化减少雨水径流和污染的能力
DOI：
10.1016/j.landurbplan.2015.08.017
复制
发表时间：
2015
影响因子：
9.1
通讯作者：
Jingtao Liu
中科院分区：
文献类型：
--
作者：
Qianqian Zhang;Liping Miao;Xiaoke Wang;D;an Liu;Liang Zhu;Bing Zhou;Jichao Sun;Jingtao Liu
为研究重庆市某绿色屋顶的雨水截留能力和径流水质，对19个降雨事件的径流和干、湿沉降样品进行了测定。结果表明，绿色屋顶能有效截留雨水径流，截留率为35.5%~ 100%，平均截留率为77.2%。绿色屋顶年截留径流量为758.7 mm，截留率为68.0%。对比绿色屋顶、沥青（对照）屋顶、干湿沉降物和降雨样品的雨水水质，发现绿色屋顶降低了TSS浓度，中和了降雨pH值，但增加了TN、NH 4 +-N、NO3−-N、TOC、COD、BOD 5、F−、Cl−、SO 42 −、K+、Ca 2+、Si 4+、DPb、DAl、DMn和DFe的浓度。比较绿色屋顶和降雨样品的污染负荷，发现绿色屋顶是NH 4 +-N的汇，而NO3--N、K+、Si 4+、Ca 2+、TOC和DAl的源。总体而言，绿色屋顶可以有效减少雨水径流、中和酸沉降并减轻大部分污染物的负荷，但径流水质受到土壤底质的严重影响。因此，我们建议绿色屋顶需要建造合适的材料，以避免径流水质恶化。
To examine the stormwater retention capacity and runoff water quality of a green roof in Chongqing, China, 19 rainfall event samples of runoff and dry and wet deposition were measured. The results showed that the green roof effectively retained stormwater runoff, with retention ranging from 35.5% to 100%, with an average retention of 77.2%. The annual runoff retention of the green roof showed that the retention volume and rate reached 758.7 mm and 68.0%, respectively. When we compared the stromwater quality among the green roof, asphalt (control) roof, dry and wet deposition and rainfall samples, found that the green roof reduced the concentration of TSS, and could neutralize the pH of rainfall; however, it increased the concentrations of TN, NH4+-N, NO3−-N, TOC, COD, BOD5, F−, Cl−, SO42−, K+, Ca2+, Si4+, DPb, DAl, DMn, and DFe. When we compared the pollutant loads from the green roof and rainfall samples, found that the green roof was a sink for NH4+-N, but was sources of NO3−-N, K+, Si4+, Ca2+, TOC and DAl. Overall, the green roof was effective in reducing stormwater runoff, neutralizing acid deposition and abating the loading of most pollutants; however, the water quality of runoff was seriously affected by the soil substrate. Therefore, we suggest that green roofs need to be constructed of suitable materials in order to avoid deterioration of runoff water quality.