The Effects of Tree Canopy Structure and Tree Coverage Ratios on Urban Air Temperature Based on ENVI-Met

Vegetation configuration in residential districts improves human comfort by effectively moderating the thermal environment. Herein, reliability of ENVI-met is verified comparing field measured with simulated data, including air temperature and relative humidity. The cooling effect trees gradually increased increasing tree coverage. Under same coverage, a crown diameter (TCD) 3 m have strongest capacity, followed TCD 7 m, 5 weakest capacity. capacity considerably higher than that m. When coverage ratio 50%, difference among three TCDs largest. 50% or 70%, at For different canopy sizes shapes under degree only when more cylindrical shape 0.2 to 0.3 °C conical ellipsoidal shapes. However, between not significant (?Ta < 0.1 °C). Our results suggest small better large for level