Journal of the Korean Society of Environmental Restoration Technology (한국환경복원기술학회지)

The Korea Society of Environmental Restoration Technology (한국환경복원기술학회)
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Analyzing Change of Discomfort Index for Transpiration of Street Tree

도시 가로수의 증산 작용으로 인한 불쾌지수 변화 분석

  • Yun, Seok-Hwan (Interdisciplinary program in Landscape Architecture, Seoul National University) ;
  • Lee, Dong-Kun (Dept. of Landscape Architecture and Rural System Engineering, Seoul National University) ;
  • Park, Chae-Yeon (Center for Social and Environmental Systems Research, National Institute for Environmental Studies)
  • 윤석환 (서울대학교 협동과정 조경학) ;
  • 이동근 (서울대학교 조경지역시스템공학부) ;
  • 박채연 (일본국립환경연구소 사회환경시스템연구센터)
  • Received : 2020.07.31
  • Accepted : 2020.10.13
  • Published : 2020.10.31
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Abstract

Thermal environment of city is getting worse due to severe urban heat island caused by climate change and urbanization. The cooling effect of street tree is regarded as a effective way to ameliorate the urban heat environment. The effect is largely made up of shadow formation and transpiration. This study aims to identify how the transpiration affects the discomfort index by analyzing comprehensive impact of the transpiration on the air temperature and relative humidity. The changes in the amount of transpiration, air temperature, and relative humidity were estimated for Seogyo-dong area which has a lot of floating population in Seoul, at 2 p.m. in dry day in July and August. On average, the transpiration of the street tree decreased the temperature 0.3℃ and increased the relative humidity 2.6% in an hour. As a result of these changes in temperature and humidity, the discomfort index rose mostly(0.036 on average). It was always get rise especially on the day when the discomfort index was above 80(0.05 on average). However, compared with the significant change in temperature and humidity, the variation of the discomfort index itself was very slight(up to 0.107). Therefore, the effect of transpiration by the street trees might not be effective in the planning to improve the thermal environment(especially on the day when the discomfort index is high). It is necessary to select the species of trees and planting location considering the cooling effect of shade formation synthetically.

Keywords

References

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