Journal of the Korean Association of Geographic Information Studies (한국지리정보학회지)

The Korean Association of Geographic Information Studies (한국지리정보학회)
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An Analysis of the Effect of Reducing Temperature and Fine Dust in the Roadside Tree Planting Scenario

가로수 식재 시나리오에 따른 기온 및 미세먼지 저감 효과 분석

  • Jeong-Hee EUM (Dept. of Landscape Architecture, Kyungpook National University) ;
  • Jin-Kyu MIN (Dept. of Landscape Architecture, Graduate School, Kyungpook National University) ;
  • Ju-Hyun PARK (Dept. of Landscape Architecture, Graduate School, Kyungpook National University) ;
  • Jeong-Min SON (Dept. of Landscape Architecture, Graduate School, Kyungpook National University) ;
  • Hong-Duck SOU (Urban Forests Division, National Institute of Forest Science) ;
  • Jeong-Hak OH (Urban Forests Division, National Institute of Forest Science)
  • 엄정희 (경북대학교 산림과학.조경학부 조경학전공) ;
  • 민진규 (경북대학교 일반대학원 조경학과) ;
  • 박주현 (경북대학교 일반대학원 조경학과) ;
  • 손정민 (경북대학교 일반대학원 조경학과) ;
  • 서홍덕 (국립산림과학원 도시숲연구과 ) ;
  • 오정학 (국립산림과학원 도시숲연구과 )
  • Received : 2023.05.08
  • Accepted : 2023.06.18
  • Published : 2023.06.30
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Abstract

This study aims to establish a scenario based on the spacing and arrangement of the roadside trees to reduce heat waves and fine dust in cities that occurred during the urbanization process and to quantitatively analyze the degree of reduction. The ENVI-met 5.0.2v model, a micro-climate simulation program, was used to analyze the degree of improvement in the thermal environment and fine dust according to the roadside tree scenario. As a result of temperature analysis according to street tree spacing, the narrower the distance between roadside trees, the lower the temperature during the day as the number of planted trees increased, and a similar pattern was shown regardless of the distance between roadside trees in the morning and evening. In the case of fine dust emitted from the road, the concentration of fine dust increased slightly due to the increase in roadside trees, but the concentration of sidewalks where people walk increased slightly or there was no difference because of blocking fine dust on trees. The temperature according to the arrangement of street trees tended to decrease as the number of planted trees increased as the arrangement increased. However, not only the amount of trees but also the crown projected area was judged to have a significant impact on the temperature reduction because the temperature reduction was greater in the scenario of planting the same amount of trees and widening the interval of arrangement. In terms of the arrangement, the fine dust concentration showed a difference from the results according to the interval, suggesting that the fine dust concentration may change depending on the relationship between the main wind direction and the tree planting direction. By quantitatively analyzing the degree of thermal environment and fine dust improvement caused by roadside trees, this study is expected to promote policies and projects to improve the roadside environment efficiently, such as a basic plan for roadside trees and a project for wind corridor forests.

본 연구는 도시화 과정에서 발생한 도시 내 폭염 및 미세먼지를 저감하기 위해 가로수의 간격과 배열에 기반한 시나리오를 설정하고, 저감 정도를 정량적으로 분석하는 것을 목표로 한다. 가로수 조성 시나리오에 따른 열환경 및 미세먼지 개선 정도를 분석하기 위해서 미기후 시뮬레이션 프로그램인 ENVI-met 5.0.2v 모델을 사용하였다. 가로수 간격에 따른 기온 분석 결과, 가로수의 간격이 좁아져 식재한 수목의 양이 많아질수록 낮 시간대의 기온이 낮아졌으며, 오전 및 저녁 시간대에는 가로수 간격에 상관없이 비슷한 양상을 보였다. 가로수 배열에 따른 기온은 배열이 증가하여 식재한 수목의 양이 많아질수록 감소하는 경향을 보였다. 하지만, 같은 양의 수목을 식재하고 배열의 간격을 넓힌 시나리오에서 기온 저감폭이 더 크게 나타났기 때문에 수목의 양뿐만 아니라 수관투영면적 역시 기온 저감에 큰 영향을 주는 것으로 판단되었다. 가로수 배열에 있어서 미세먼지 농도는 간격에 따른 결과와 차이를 보였는데, 이는 주풍향과 수목 식재 방향의 관계에 따라 미세먼지 농도가 변화할 수 있음을 시사한다. 본 연구는 가로녹지에 의한 열환경 및 미세먼지 개선 정도를 정량적으로 분석함으로써, 가로수 조성·관리 기본 계획, 바람길숲 조성 사업 등 효율적인 가로환경 개선을 위한 정책 및 사업 추진에 활용될 수 있을 것으로 기대된다.

Keywords

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