The simulation of environmental impacts of extensive and intensive green roofs in Yazd city

Environmental and microclimate studies of various green roof types in arid areas of Iran should be carefully studied in order to assess their potential effects on the surrounding environment and the citizens, before the development and expansion of them. By the same token, a research was performed in one of the residential areas of the Yazd city by using climate data of 2014. In this study, the software simulation on the research area at the same time and place was done, including: intensive green roof, extensive green roof and roof without vegetation with ENVI-met model. The outputs of this model indicated that the effects of temperature, relative humidity and thermal comfort index in the simulated green roofs have been negligible and inconsiderable in comparison with the roof without vegetation in the hot period of the year. Also the three simulated sites were in the extreme heat tension range.