A field study to evaluate runoff quality from green roofs.
A field study to evaluate runoff quality from green roofs.
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DOI：
10.1016/j.watres.2011.12.050
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发表时间：
2012-03
期刊：
影响因子：
12.8
通讯作者：
K. Vijayaraghavan;U. Joshi;R. Balasubramanian
中科院分区：
文献类型：
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作者：
K. Vijayaraghavan;U. Joshi;R. Balasubramanian
绿色屋顶作为一种改善城市环境质量的实用策略正在兴起。然而，绿色屋顶对雨水水质的影响仍然是城市规划者和环境政策制定者关注的话题。本研究调查了绿色屋顶是各种金属（Na、K、Ca、Mg、Al、Fe、Cu、Cd、Pb、Zn、Mn、Cr、Ni、Li和Co）、无机阴离子（NO3-、NO2-、PO 43-、SO 42-、Cl-、F-和Br-）和阳离子（NH 4+）的源还是汇。建造了一系列绿色屋顶组件。四个不同的真实的降雨事件和几个人工降雨事件被认为是研究。结果表明，径流中大部分化学成分的浓度在降雨开始时最高，在随后的降雨过程中下降。径流中的一些重要成分包括Na、K、Ca、Mg、Li、Fe、Al、Cu、NO3−、PO 43 −和SO 42 −。然而，这些化学成分在屋顶径流中的浓度在很大程度上取决于绿色屋顶所用基质的性质和降雨量。根据美国环保局的淡水质量标准，我们得出结论，本研究中使用的绿色屋顶是合理有效的，除了径流含有大量的NO3-和PO 43-。
Green (vegetated) roofs are emerging as practical strategies to improve the environmental quality of cities. However, the impact of green roofs on the storm water quality remains a topic of concern to city planners and environmental policy makers. This study investigated whether green roofs act as a source or a sink of various metals (Na, K, Ca, Mg, Al, Fe, Cu, Cd, Pb, Zn, Mn, Cr, Ni, Li and Co), inorganic anions (NO3−, NO2−, PO43−, SO42−, Cl−, F−and Br−) and cation (NH4+). A series of green roof assemblies were constructed. Four different real rain events and several artificial rain events were considered for the study. Results showed that concentrations of most of the chemical components in runoff were highest during the beginning of rain events and subsided in the subsequent rain events. Some of the important components present in the runoff include Na, K, Ca, Mg, Li, Fe, Al, Cu, NO3−, PO43−and SO42−. However, the concentration of these chemical components in the roof runoff strongly depends on the nature of substrates used in the green roof and the volume of rain. Based on the USEPA standards for freshwater quality, we conclude that the green roof used in this study is reasonably effective except that the runoff contains significant amounts of NO3−and PO43−.