| Title |
The Impact of the Geometry of Urban Residential Street Canyons on Thermal Comfort |
| Authors |
차수연(Cha, Su-Yeon) ; 오규식(Oh, Kyu-Shik) |
| DOI |
https://doi.org/10.5659/JAIK.2020.36.12.187 |
| Keywords |
Urban Morphology; Urban Street Canyon; Residential Environment; Physiologically Equivalent Temperature(PET); Aspect(Height/Width) Ratio; Street Orientation |
| Abstract |
This study analyzed the impact of the geometry of Urban Street Canyons (USCs) on citizens’ thermal comfort in order to manage urban
spaces in response to the deterioration of the urban thermal environment due to climate change. Aspect ratio, formed by the height of
buildings and width of streets, and street orientation were selected as the geometric characteristics of USCs. PET at 1.5m height calculated
by ENVI-met, the microclimate simulation software, was chosen to determine the parameter of thermal comfort. Using the decision tree
analysis, USCs of the case study area were classified into 10 nodes according to the geometry and thermal perception of each USCs. In
addition, PET by each node derived by segmentation was analyzed over time. As a result, thermal comfort was found to differ according to
the shadow generation rate of the streets ? the higher the shadow generation rate, the more comfortable the thermal environment. More
specifically, first, the higher the aspect ratio is, the more thermal comfort is found. Second, the more parallel the street orientation is and
according to the direction of sunlight, the less thermal comfort is determined. Third, the impact of street orientation is indicated clearly when
the aspect ratio is between 1.471 to 2.209. These results can be applied to establishing urban form, framed by building and street or for
redeveloping street spaces in consideration to the thermal environment. |