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

  • 제26권1호
  • /
  • Pages.47-59
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  • 2023
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  • 1229-3032(pISSN)
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  • 2733-5011(eISSN)
한국환경복원기술학회 (The Korea Society of Environmental Restoration Technology)
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가로수와 바닥 포장 표면 알베도의 도시 열 환경 개선 효과

Impact of Urban Thermal Environment Improvement by Street Trees and Pavement Surface Albedo

  • 김나연 (서울대학교 생태조경.지역시스템공학부 ) ;
  • 김은섭 (서울대학교 환경대학원 협동과정 조경학 ) ;
  • 윤석환 (서울대학교 환경대학원 협동과정 조경학 ) ;
  • 박정강 (서울대학교 생태조경.지역시스템공학부 ) ;
  • 김상혁 (서울대학교 생태조경.지역시스템공학부 ) ;
  • 남상준 ((주)현우그린 ) ;
  • 제화준 ((주)현우그린 ) ;
  • 이동근 (서울대학교 농업생명과학대학)
  • Na-youn Kim (Dept. of Landscape Architecture and Rural System Engineering, Seoul National University) ;
  • Eun-sub Kim (Interdisciplinary program in Landscape Architecture, Seoul National University) ;
  • Seok-hwan Yun (Interdisciplinary program in Landscape Architecture, Seoul National University) ;
  • Zheng-gang Piao (Dept. of Landscape Architecture and Rural System Engineering, Seoul National University) ;
  • Sang-hyuck Kim (Dept. of Landscape Architecture and Rural System Engineering, Seoul National University) ;
  • Sang-jun Nam (Hyunwoo Green Co.) ;
  • Hwa-Jun Jea (Hyunwoo Green Co.) ;
  • Dong-kun Lee (Korea institute of green infrastructure)
  • 투고 : 2022.12.29
  • 심사 : 2023.01.27
  • 발행 : 2023.02.28
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초록

Due to climate change and urbanization, abnormally high temperatures and heat waves are expected to increase in urban and deteriorate thermal comfort. Planting of street trees and changing the albedo of urban surfaces are the strategies for mitigating the thermal environment of urban, and both of these strategies affect the exposure and blocking of radiative fluxes to pedestrians. After measuring the shortwave and longwave radiation according to the ground surface with different albedo and the presence of street trees using the CNR4 net radiometer, this study analyzed the relationship between this two strategies in terms of thermal environment mitigation by calculating the MRT(Mean Radiant Temperature) of each environment. As a result of comparing the difference between the downward shortwave radiation measured under the right tree and at the control, the shortwave radiation blocking effect of the tree increased as the downward shortwave radiation increased. During daytime hours (from 11 am to 3 pm), the MRT difference caused by the albedo difference(The albedo of the surfaces are 0.479 and 0.131, respectively.) on surfaces with no tree is approximately 3.58℃. When tree is present, the MRT difference caused by the albedo difference is approximately 0.49℃. In addition, in the case of the light-colored ground surface with high albedo, the surface temperature was low and the range of temperature change was lower than the surrounding surface with low albedo. This result shows that the urban thermal environment can be midigate through the planting of street trees, and that the ground surface with high albedo can be considered for short pedestrians. These results can be utilized in planning street and open space in urban by choosing surfaces with high albedo along with the shading effect of vegetation, considering the use by various users.

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