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Dispersal of Hazardous Substance in a City Environment Based on Weather Conditions and Its Risk Assessment at the Pedestrian Level
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기상조건에 따른 도시내 위험물질 확산정보와 보행자환경 위험영향평가

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Type
Academic journal
Author
김은령 (한국외국어대학교 차세대도시농림융합기상사업단) Gwang-Jin Lee (한국외국어대학교 차세대도시농림융합기상사업단) Chaeyeon YI (한국외국어대학교 차세대도시농림융합기상사업단)
Journal
한국환경영향평가학회 환경영향평가 환경영향평가 제26권 제4호 KCI Accredited Journals
Published
2017.8
Pages
242 - 256 (15page)
DOI
https://doi.org/10.14249/eia.2017.26.4.242

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Dispersal of Hazardous Substance in a City Environment Based on Weather Conditions and Its Risk Assessment at the Pedestrian Level
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Abstract· Keywords

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In this paper, dispersion scenarios concerning various meteorological conditions and real urban structures were made to estimate the impacts of hazardous substance leakage accidents and to reduce damages. Based on the scenario of the hazardous substance dispersion, the characteristics of the risk in the pedestrian environment were analyzed in Gangnam, Seoul. The scenarios are composed of 48 cases according to the meteorological conditions of wind direction and wind speed. In order to analyze the dispersion characteristics of the hazardous substances, simulations were conducted using a computational fluid dynamic (CFD) model with hydrogen fluoride releases. The validation for the simulated wind was conducted at a specific period, and all the calculated verification indices were within the valid range. As a result of simulated dispersion field at pedestrian level, it was found that the dispersion pattern was influenced by the flow, which was affected by the artificial obstacles. Also, in the case of the weakest wind speed of the inflow, the dispersion of the hazardous substance appeared in the direction of the windward side at the pedestrian level due to the reverse flow occurred at lower layers. Through this study, it can be seen that the artificial structures forming the city have a major impact on the flow formed in urban areas. The proposed approach can be used to simulate the dispersion of the hazardous substances and to assess the risk to pedestrians in the industrial complexes dealing with actual hazardous substances in the future.
#CFD 모델 #보행자 환경 #위험물질 확산 #도시 지역 #위험영향평가 #CFD model #Pedestrian environment #Hazardous substance's dispersion #Complex urban area

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References (24)

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Britter RE / 2003 / Flow and dispersion in urban areas / Annu. Rev. Fluid Mech 35:469~496 google schola Castro IP / 1997 / Flow and dispersion over topography: a comparison between numerical and laboratory data for two-dimensional flow / Atmospheric Environment 31:893~850 google schola 최희욱 / 2012 / CFD-WRF 접합 모델을 이용한 도시 지역 화재 시나리오별 확산 특성 연구 / 대기 22(1):47~55 dbpia De Melo AMV / 2012 / Modelling of odour dispersion around a pig farm building complex using AERMOD and CALPUFF. Comparison with wind tunnel results / Building and Environment 56:8~20 google schola 구슬기 / 2013 / 구미 불산 누출사고 지점 주변 식물의 불소화합물 농도 분포 및 공기 중 불화수소 농도 추정에 관한 연구 / 한국환경보건학회지 39(4):346~353 dbpia

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