Journal of Environmental Impact Assessment (환경영향평가)

Korean Society of Environmental Impact Assessment (한국환경영향평가학회)
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CFD Simulation of Changesin NOX Distribution according to an Urban Renewal Project

CFD 모델을 이용한 도시 재정비 사업에 의한 NOX 분포 변화 모의

  • Kim, Ji-Hyun (Department of Environmental and Biomedical Convergence, Kangwon National University) ;
  • Kim, Yeon-Uk (Department of Environmental and Biomedical Convergence, Kangwon National University) ;
  • Do, Heon-Seok (Department of Environmental Science, Kangwon National University) ;
  • Kwak, Kyung-Hwan (School of Natural Resources and Environmental Science, Kangwon National University)
  • 김지현 (강원대학교 환경의생명융합학과) ;
  • 김연욱 (강원대학교 환경의생명융합학과) ;
  • 도현석 (강원대학교 환경학과) ;
  • 곽경환 (강원대학교 환경융합학부)
  • Received : 2021.01.31
  • Accepted : 2021.05.26
  • Published : 2021.06.30
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Abstract

In this study, the effect of the restoration of Yaksa stream and the construction of an apartment complex by the urban renewal project in the Yaksa district of Chuncheon on air quality in the surrounding area was evaluated using computational fluid dynamics (CFD) model simulations. In orderto compare the impact of the project, wind and pollutant concentration fields were simulated using topographic data in 2011 and 2017, which stand for the periods before and after the urban renewal project, respectively. In the numerical experiments, the scenarios were set to analyze the effect of the construction of the apartment complex and the effect of stream restoration. Wind direction and wind speed data obtained from the Chuncheon Automated Synoptic Observing System (ASOS) were used as the inflow boundary conditions, and the simulation results were weighted according to the frequencies of the eight-directional inflow wind directions. The changes in wind speed and NOX concentration distribution according to the changes in building and terrain between scenarios were compared. As a result, the concentration of NOX emitted from the surrounding roads increased by the construction of the apartment complex, and the magnitude of the increase was reduced as the result of including the effect of stream restoration. The concentration of NOX decreased around the restored stream, while the concentration increased significantly around the constructed apartment complex. The increase in the concentration of NOX around the apartment complex was more pronounced in the place located in the rear of the wind direction to the apartment complex, and the effect remains up to the height of the building. In conclusion, it was confirmed that the relative arrangement of apartment complex construction and stream restoration in relation to the main wind direction of the target area was one of the major factors in determining the surrounding air quality.

본 연구에서는 전산유체역학(CFD) 모델을 이용한 수치 모의에서 춘천시 약사지구 도시 재정비 사업에 의한 약사천 복원과 아파트 단지 건설이 주변 지역의 오염물질 농도에 미치는 영향을 분석하였다. 사업에 의한 영향을 비교하기 위해 도시재정비 사업 전과 후인 2011년과 2017년의 지형 자료를 이용하여 바람장과 오염물질 농도장을 모의하였다. 수치 실험에서 아파트 단지 건설의 영향과 하천 복원의 효과를 구분하여 분석하도록 시나리오를 구성하였다. 대상 지역의 평균적인 배경 바람장을 반영하기 위해 춘천 종관기상관측소(ASOS)의 풍향 및 풍속 자료를 유입 경계 조건으로 사용하고, 모의 결과를 유입 풍향의 8방위별 빈도에 따라 가중평균하였다. 시나리오 간 건물·지형 변화에 따른 풍속과 NOX 농도 분포의 차이를 비교하였다. 그 결과 주변 도로에서 배출된 NOX 농도는 아파트 단지 건설에 의해 증가하였으며, 아파트 단지 건설과 하천 복원을 함께 고려한 결과에서는 증가 폭이 감소하였다. 이를 지점별로 나누어볼 때, 복원한 하천 주변으로는 NOX 농도가 감소하는 한편, 건설한 아파트 단지 주변으로는 농도가 크게 증가하였다. 아파트 단지 주변의 NOX 농도 증가는 풍향을 기준으로 아파트 단지의 후면에 위치한 곳에서 더욱 뚜렷하였으며, 그 영향은 건물 높이까지 나타났다. 이러한 결과를 통해 사업 대상 지역의 주풍향에 대한 아파트 단지 건설과 하천 복원의 상대적인 배치가 주변 대기질을 결정하는 주요 요소임을 확인하였다.

Keywords

Acknowledgement

본 연구는 2020년 대학혁신지원사업 도전 연구비 지원 프로그램과 과학기술정보통신부의 재원으로 한국연구재단(NRF-2020R1C1C1012354)의 지원을 받아 수행되었습니다.

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