Abstract
To explore the role of tree canopy morphology on the urban thermal environment and human comfort, this paper considers the variation of four factors (Top Canopy Height (TCH), Leaf Area Density (LAD), Bottom Canopy Height (BCH) and Canopy Diameter (CD)) and uses an orthogonal experiment method (OEM) to build 25 simulation scenarios. In an idealized model planted with trees, the effects of changes in canopy morphological parameters on air temperature and Physical Equivalent Temperature (PET) at a pedestrian height of 1.5m are simulated and discussed using ENVI-met software. The results show that the air temperatures for 25 different groups differed significantly during the day and less at night. At the hottest time of the day (15:00), there was a difference of 7.8°C between the coolest (ID 11) and hottest (ID 16) groups. TCH, LAD and CD are all negatively correlated with PET, while the BCH is positively correlated with PET. Among the four canopy morphology parameters, CD has the most significant effect on PET at a pedestrian level of 1.5m.
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