The impact of the geometry of urban residential street canyons on thermal comfort-based on a decision tree analysis method

Su Yeon Cha, Kyu Shik Oh

Research output: Contribution to journalArticlepeer-review

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.

Original languageEnglish
Pages (from-to)187-198
Number of pages12
JournalJournal of the Architectural Institute of Korea
Volume36
Issue number12
DOIs
StatePublished - 2020

Keywords

  • Aspect(Height/Width) Ratio
  • Physiologically Equivalent Temperature(PET)
  • Residential Environment
  • Street Orientation
  • Urban Morphology
  • Urban Street Canyon

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