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자료유형
학술저널
저자정보
김은령 (부경대학교) 박록진 (서울대학교) 이대근 (국립기상과학원) 김재진 (부경대학교)
저널정보
한국기상학회 대기 대기 Vol.25 No.3
발행연도
2015.9
수록면
473 - 482 (10page)

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In this study, street canyons with a higher downwind building (so called, step-up street canyons) are considered for understanding characteristics of flow and reactive pollutants’ dispersion as a basic step to understand the characteristics in wider urban areas. This study used a CFD_NIMR_SNU coupled to a chemistry module just including simple NO<SUB>X</SUB>-O₃ photochemical reactions. First, flow characteristics are analyzed in step-up street canyons with four aspect ratios (0.33, 0.47, 0.6, 0.73) defined as ratios of upwind building heights to downwind building height. The CFD_NIMR_SNU reproduced very well the main features (that is, vortices in the street canyons) which appeared in the wind-tunnel experiment. Wind speed within the street canyons became weak as the aspect ratio increased, because volume of flow incoming over the upwind building decreased. For each step-up street canyon, chemistry transport model was integrated up to 3600 s with the time step of 0.5 s. The distribution patterns of NO<SUB>X</SUB> and O₃ were largely dependent on the mean flow patterns, however, NOX and O₃ concentrations were partly affected by photochemical reactions. O₃ concentration near the upwind lower region of the street canyons was much lower than background concentration, because there was much reduction in O₃ concentration due to NO titration there. Total amount of NO<SUB>X</SUB> in the street canyons increased with the aspect ratio, resulting from the decrease of mean wind intensity.

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Abstract
1. 서론
2. 수치 실험 방법
3. 결과와 토의
4. 요약 및 결론
REFERENCES

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UCI(KEPA) : I410-ECN-0101-2016-453-001958854