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CFD 모델을 이용한 체승 도시협곡의 흐름과 반응성 대기오염물질 확산 특성 연구

A Study on the Characteristics of Flow and Reactive Pollutants' Dispersion in Step-up Street Canyons Using a CFD Model

  • 김은령 (부경대학교 환경대기과학과) ;
  • 박록진 (서울대학교 지구환경과학부) ;
  • 이대근 (국립기상과학원 응용기상연구과) ;
  • 김재진 (부경대학교 환경대기과학과)
  • Kim, Eun-Ryoung (Department of Environmental Atmospheric Sciences, Pukyong National University) ;
  • Park, Rokjin J. (School of Earth and Environmental Sciences, Seoul National University) ;
  • Lee, Dae-Geun (Applied Meteorology Research Division, National Institute of Meteorological Research) ;
  • Kim, Jae-Jin (Department of Environmental Atmospheric Sciences, Pukyong National University)
  • 투고 : 2015.03.25
  • 심사 : 2015.06.16
  • 발행 : 2015.09.30

초록

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 $NO_X-O_3$ 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 $NO_X$ and $O_3$ were largely dependent on the mean flow patterns, however, $NO_X$ and $O_3$ concentrations were partly affected by photochemical reactions. $O_3$ concentration near the upwind lower region of the street canyons was much lower than background concentration, because there was much reduction in $O_3$ concentration due to NO titration there. Total amount of $NO_X$ in the street canyons increased with the aspect ratio, resulting from the decrease of mean wind intensity.

키워드

참고문헌

  1. Addepalli, B., and E. R. Pardyjak, 2013: Investigation of the flow structure in step-up street canyons-mean flow and turbulence statistics. Bound.-Layer Meteor, 148, 133-155. https://doi.org/10.1007/s10546-013-9810-5
  2. Baek, S. O., and C. G. Jeon, 2013: Current status and future directions of management of hazardous air pollutants in Korea - Focusing on ambient air monitoring issues. J. Korean Soc. Atmos. Environ., 29, 513-527. https://doi.org/10.5572/KOSAE.2013.29.5.513
  3. Baik, J.-J., and J.-J. Kim, 1999: A numerical study of flow and pollutant dispersion characteristics in urban street cantons. J. Appl. Meteorol., 38, 1576-1589. https://doi.org/10.1175/1520-0450(1999)038<1576:ANSOFA>2.0.CO;2
  4. Baik, J.-J., R.-S. Park, H.-Y. Chun, and J.-J. Kim, 2000: A laboratory model of urban street-canyon flows. J. Appl. Meteorol., 39, 1592-1600. https://doi.org/10.1175/1520-0450(2000)039<1592:ALMOUS>2.0.CO;2
  5. Castro, I. P., and D. D. Apsley, 1997: Flow and dispersion over topography: a comparison between numerical and laboratory data for two-dimensional flow. Atmos. Environ., 31, 893-850.
  6. Chan, S. T., and M. J. Leach, 2007: A validation of FEM3MP with Joint Urban 2003 data. J. Appl. Meteorol. Clim., 46, 2127-2146. https://doi.org/10.1175/2006JAMC1321.1
  7. Han, J. S., K. J. Moon, R. H. Kim, S. A. Shin, Y. D. Hong, and I. R. Jung, 2006: Preliminary source apportionment of ambient VOCs measured in Seoul metropolitan area by positive matrix factorization. J. Korean Soc. Atmos. Environ., 22, 85-97.
  8. Jang, K.-W., Y.-M. Lee, D.-G. Lee, C. Yoo, Y.-W. Jung, and J.-H. Hong, 2011: Analysis of automobile NOX emission trend in the Seoul metropolitan area. Korea Environ. Policy Admin. Soc., 19, 1-16.
  9. Jeong, S. J., and O. H. Park, 1999: Development of a New $E-{\varepsilon}$ turbulence model for analysing the air flow field within an urban street canyon. J. Korean Soc. Atmos. Environ., 15, 281-289.
  10. Kim, J.-J., and J.-J. Baik, 2004: A numerical study of the effects of ambient wind direction on flow and dispersion in urban street canyons using the RNG $k-\varepsilon$ turbulence model. Atmos. Environ., 38, 3039-3048. https://doi.org/10.1016/j.atmosenv.2004.02.047
  11. Kim, J.-J., and D.-Y. Kim, 2009: Effects of a building's density on flow in urban areas. Adv. Atmos. Sci., 26, 45-56. https://doi.org/10.1007/s00376-009-0045-9
  12. Lee, K.-Y., K.-H. Kwak, S.-B. Park, and J.-J. Baik, 2013: Sensitivity of ozone to NOx and VOCs in street canyon. J. Korean Soc. Atmos. Environ., 29, 307-316. https://doi.org/10.5572/KOSAE.2013.29.3.307
  13. Lee, T. W., J. W. Kim, J. T. Lee, and J. S. Kim, 2012: Quantified contribution of high emitting vehicles to emission inventories for gasoline passenger cars based on inspection and maintenance program data. J. Korean Soc. Atmos. Environ., 28, 396-410. https://doi.org/10.5572/KOSAE.2012.28.4.396
  14. Lin, S., X. Liu, L. H. Le, and S. A. Hwang, 2008: Chronic exposure to ambient ozone and asthma hospital admissions among children. Environ Health Perspect, 116, 1725-30. https://doi.org/10.1289/ehp.11184
  15. Nyberg, F., P. Gustavsson, L. Jarup, T. Bellander, N. Berglind, R. Jakobsson, and G. Pershagen, 2000: Urban air pollution and lung cancer in Stockholm. Epidemiology, 11, 487-495. https://doi.org/10.1097/00001648-200009000-00002
  16. Oke, T. R., 1988: Street design and urban canopy layer climate. Energ. Buildings, 11, 103-113. https://doi.org/10.1016/0378-7788(88)90026-6
  17. Park, S.-J., J.-J. Kim, M. J. Kim, R. J. Park, and H.-B. Cheong, 2015: Characteristics of flow and reactive pollutant dispersion in urban street canyons. Atmos. Environ., 108, 20-31. https://doi.org/10.1016/j.atmosenv.2015.02.065
  18. Salizzoni, P., L. Soulhac, and P. Mejean, 2009: Street canyon ventilation and atmospheric turbulence. Atmos. Environ., 43, 5056-5067. https://doi.org/10.1016/j.atmosenv.2009.06.045
  19. Shin, D. C., Y. W. Lim, S. E. Park, and Y. Chung, 1996: Assessment of health risk posed by organic substances of suspended particulate matters in a heavy traffic area of Seoul. J. Korea Air Pollu. Res. Assoc., 12, 567-576.
  20. Sillman, S., 1999: The relation between ozone, NOx and hydrocarbons in urban and polluted rural environments. Atmos. Environ., 33, 1821-1845. https://doi.org/10.1016/S1352-2310(98)00345-8
  21. Weschler, C. J., 2006: Ozone's impact on public health: Contributions from indoor exposures to ozone and products of ozone-initiated chemistry. Environ. Health Perspectives., 114, 1489-1496. https://doi.org/10.1289/ehp.9256
  22. Wild, O., X. Zhu, and M. J. Prather, 2000: Fast-J: Accurate simulation of in- and below-cloud photolysis in tropospheric chemical models. J. Atmos. Chem., 37, 245-282. https://doi.org/10.1023/A:1006415919030
  23. Wood, C. R., and Coauthors, 2009: Dispersion experiments in central London: the 2007 DAPPLE project. Bull. Amer. Meteor. Soc., 90, 955-969. https://doi.org/10.1175/2009BAMS2638.1

피인용 문헌

  1. Flow Characteristics Around Step-Up Street Canyons with Various Building Aspect Ratios pp.1573-1472, 2019, https://doi.org/10.1007/s10546-019-00494-9