Green roofs have been recognized as a valuable approach to adjust for urban microclimate, purifying rainwater and increasing biodiversity in urban spaces. Besides, it can be used to control rainwater runoff effectively. The adsorption function of green roofs on rainwater runoff mainly depends on the interception effect of the vegetation layer and the absorption and storage effect of the substrate layer. The effects of rainwater runoff are impacted by varying substrate types. In this study, the formation time of runoff for silicate mixed matrix (grass soil: pumice = 3:1) and high-temperature combustion oxide mixed matrix (grass soil: slag = 3:1) were measured and compared in a rainfall simulation experiment. The different responses between their runoff intensity and time were analyzed. The results showed that the runoff formation time was 255 min for the silicate mixed matrix and the runoff peak time was 310 min when the rainfall intensity was 0.3 mm/min and the substrate thickness was 300 mm. The runoff formation time was 230 min for the high temperature combustion oxide mixed matrix and the runoff peak time was 290 min in the same conditions. Both the runoff formation time (over 9.8%) and the peak runoff time (over 6.5%) for the silicate mixed matrix were longer than the time for the high temperature combustion oxide mixed matrix. Based on the results from this study, the silicate mixed matrix is more effective than the high temperature combustion oxide mixed matrix in control rainwater runoff on green roofs.
As the main living space and carrier of the population, cities and buildings have become more seriously affected by changes in global environment in recent years. The deteriorating living environment has brought about the quality of survival of the population, the government’s administrative management, and the sustainable development of the environment. This article has found that green roofs on urban environmental management and building energy consumption have found that green roofs can have an important impact on urban environmental management. In extreme weather events, green roof has a maximum cooling effect of 26℃ in the daytime, and its warming effect at night has been suppressed to a certain extent; the heat preservation time of the green roof can be up to 17 hours after the superposition of precipitation weather incidents, and its heat preservation effect is positively related to the temperature in the daytime. The green roof can reduce the energy consumption of the building by 106W/ ㎡/d in the extreme weather incident, while its energy -saving effect is reduced to 45W/m2/d after superimposing the precipitation meteorological incident.
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