Effects of Green, Blue, and Blue-green Roofs on Runoff Quality

被引：0
|
作者：
Zhang S.-X. [1 ]
Zhang S.-H. [1 ,2 ,3 ]
Yan J. [1 ]
Wang K. [1 ]
Yang H. [1 ]
Wang R.-Z. [1 ]
Zhang W.-L. [1 ]
Li H.-L. [1 ]
机构：
[1] School of Soil and Water Conservation, Beijing Forestry University, Beijing
[2] National Station for Forest Ecosystem Research in Jixian County, Linfen
[3] Beijing Engineering Research Center of Soil and Water Conservation, Beijing
来源：
Huanjing Kexue/Environmental Science | 2023年 / 44卷 / 01期
关键词：
blue roof; blue-green roof; green roof; heavy metals; nutrients; runoff quality;
D O I：
10.13227/j.hjkx.202203191
中图分类号：
学科分类号：
摘要：
Roofs occupy a great proportion of urban impervious surfaces, and the implementation of eco-roof construction in urban areas is beneficial to alleviate the ecological and environmental problems caused by rapid urbanization. In this study, different eco-roofs (i. e., green roofs, blue roofs, and blue-green roofs) were set up in downtown Beijing. During the rainy season of 2019, the rainfall characteristics, runoff volumes, and concentrations of nutrients and heavy metals in runoff from different eco-roofs were monitored. Further, the pollutant loads and runoff quality indices (RQI) of the eco-roofs were calculated to evaluate the comprehensive influences of configurations on the runoff quality of these eco-roofs. During the rainy season of 2019, all eco-roofs had favorable rainwater retention capacity (with average runoff reduction rates between 75.7% and 78.9%), and there were no significant differences in runoff reduction rates among different eco-roofs (P >0.05). Compared to rainwater, all the eco-roofs were sinks of NH4+-N, DZn, and DCd, and the load reduction rates of these pollutants were 63.8%-96.4%, 68.6%-90.7%, and 39.8%-54.5%, respectively. However, all the eco-roofs were sources of NO3--N, DCr, DFe, and DNi. The blue roof was a sink of DCu (with a pollutant load reduction rate of 21.9%) and did not affect the cumulative load of PO34--P in runoff. However, the green roof and blue-green roof were the sources of PO34--P and DCu. The RQI value of the blue roof was the highest, followed by that of the blue-green roof and green roof. The RQI value of the green roof was significantly lower than that of the blue and blue-green roofs (P <0.05). These results indicated that the runoff quality of the blue roof was the best, whereas that of the green roof was the worst. Adding a storage layer to the green roofs could significantly improve the runoff quality. The results of this study provide scientific references for the selection and design of eco-roof facilities. © 2023 Science Press. All rights reserved.
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页码：303 / 311
页数：8
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