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Effects of Heat Intensity and Inflow Wind on the Reactive Pollution Dispersion in Urban Street Canyon

  • Xiaomin Xie (谢晓敏)
  • Zhongwei Zhu (朱中伟)
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Abstract

This paper investigates the impacts of heating intensity and inflow wind speed on the characteristics of reactive pollutant dispersion in street canyons using the computational fluid dynamic (CFD) model that includes the transportation of NO, NO2, and O3 coupled with NO-NO2-O3 photochemistry. The results indicated that the heat intensity and inflow wind speed have a significant influence on the flow field, temperature field and the characteristics of reactive pollutant dispersion in and above the street canyon. With the street canyon bottom heating intensity increasing, NO, NO2 and O3 concentrations in street canyon are decreased. The O3 concentration reductions are even more than the NO and NO2 concentrations. Improving the inflow wind speed can significantly reduce the NO and NO2 concentrations within street canyons. But the O3 concentrations have a slight rise with wind speed increasing. The results would be useful for understanding the interrelation among reactive vehicle emissions, and provide references for urban planners.

Key words

reactive pollutant dispersion street canyon heat intensity inflow wind 

CLC number

X 515 

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References

  1. [1]
    SINI J F, ANQUETIN S, MESTAYER P G. Pollution dispersion and thermal effects in urban street canyon [J]. Atmospheric Environment, 1996, 30(15): 2659–2677.CrossRefGoogle Scholar
  2. [2]
    XIA J Y, LEUNG D Y C. Pollutant dispersion in urban street canopies [J]. Atmospheric Environment, 2001, 35(11): 2033–2043.CrossRefGoogle Scholar
  3. [3]
    LI X X, LIU C H, LEUNG D Y C. Development of a kε model for the determination of air exchange rates for street canyons [J]. Atmospheric Environment, 2005, 39: 7285–7296.CrossRefGoogle Scholar
  4. [4]
    LIU C H, BARTH M C, LEUNG D Y C. Large-eddy simulation of flow and pollutant transport in street canyons of different building-height-to-street-width ratios [J]. Journal of Applied Meteorology, 2004, 43: 1410–1424.CrossRefGoogle Scholar
  5. [5]
    LIU C H, LEUNG D Y C, BARTH M C. On the prediction of air and pollutant exchange rates in street canyons of different aspect ratios using large-eddy simulation [J]. Atmospheric Environment, 2005, 39: 1567–1574.Google Scholar
  6. [6]
    ELIASSON L, OFFERLE B, GRIMMOND C S B, et al. Wind fields and turbulence statistics in an urban street canyon [J]. Atmospheric Environment, 2006, 40: 1–16.CrossRefGoogle Scholar
  7. [7]
    CHAN T L, DONG G, LEUNG C W, et al. Validation of a two-dimensional pollutant dispersion model in an isolated street canyon [J]. Atmospheric Environment, 2002, 36: 861–872.CrossRefGoogle Scholar
  8. [8]
    MERONEY R N, PAVAGEAU M, RAFAILIDIS S, et al. Study of line source characteristic for 2-D physical modelling of pollutant dispersion in street canyons [J]. Journal of Wind Engineering and Industrial Aerodynamics, 1996, 62: 37–56.CrossRefGoogle Scholar
  9. [9]
    KASTNER-KLEIN P, PLATE E J. Wind-tunnel study of concentration fields in street canyons [J]. Atmospheric Environment, 1999, 33(24/25): 3973–3979.CrossRefGoogle Scholar
  10. [10]
    BAKER C J, HARGREAVES D M. Wind tunnel evaluation of a vehicle pollution dispersion model [J]. Journal of Wind Engineering and Industrial Aerodynamics, 2001, 89: 187–200.CrossRefGoogle Scholar
  11. [11]
    KASTNER-KLEIN P, FEDOROVICH E, ROTACH M W. A wind tunnel study of organized and turbulent air motions in street canyons [J]. Journal of Wind Engineering and Industrial Aerodynamics, 2001, 89: 849–861.CrossRefGoogle Scholar
  12. [12]
    BERKKOWICZ R, PALMGREN F, HERTEL O, et al. Using measurements of air pollution in streets for evaluation of urban air quality-meterological analysis and model calculations [J]. The Science of the Total Environment, 1996, 189/190: 259–265.CrossRefGoogle Scholar
  13. [13]
    CROXFORD B, PENN A. Siting considerations for urban pollution monitors [J]. Atmospheric Environment, 1998, 32(6): 1049–1057.CrossRefGoogle Scholar
  14. [14]
    KIM J J, BAIK J J. Urban street-canyon flows with bottom heating [J]. Atmospheric Environment, 2001, 35: 3395–3404.CrossRefGoogle Scholar
  15. [15]
    LOUKA P, VACHON G, SINI J F, et al. Thermal effects on the airflow in a street canyon—NANTES’99 experimental results and model simulations [J]. Water, Air, and Soil Pollution: Focus, 2002, 2(5/6): 351–364.CrossRefGoogle Scholar
  16. [16]
    XIE X M, HUANG Z, WANG J S, et al. The impact of solar radiation and street layout on pollutant dispersion in street canyon [J]. Building and Environment, 2005, 40: 201–212.CrossRefGoogle Scholar
  17. [17]
    XIE X M, HUANG Z, WANG J S, et al. Thermal effects on vehicle emission dispersion in an urban street canyon [J]. Transportation Research Part D: Transportation and Environment, 2005, 10: 197–212.CrossRefGoogle Scholar
  18. [18]
    BAKER J, WALKER H L, CAI X M. A study of the dispersion and transport of reactive pollutants in and above street canyons—A large eddy simulation [J]. Atmosphere Environment, 2004, 38: 6883–6892.CrossRefGoogle Scholar
  19. [19]
    BAIK J J, KANG Y S, KIM J J. Modeling reactive pollutant dispersion in an urban street canyon [J]. Atmospheric Environment, 2007, 41: 934–949.CrossRefGoogle Scholar
  20. [20]
    KIKUMOTO H, OOKA R. A numerical study of air pollutant dispersion with bimolecular chemical reactions in an urban street canyon using large-eddy simulation [J]. Atmospheric Environment, 2012, 54: 456–464.CrossRefGoogle Scholar
  21. [21]
    ZHU Z W, XIE X M, HUANG Z. Numerical investigation of reactive pollutant dispersion in an urban street canyon with bottom heating [J]. Chinese Journal of Hydrodynamics, 2013, 28(2): 159–166 (in Chinese).Google Scholar
  22. [22]
    MARYAM M, HOSSEIN A, BIJIAN F. A numerical investigation of reactive air pollutant dispersion in urban street canyons with tree planting [J]. Atmospheric Pollution Research, 2017, 8: 253–266.CrossRefGoogle Scholar
  23. [23]
    UEHARA K, MURAKAMI S, OIKAWA S, et al. Wind tunnel experiments on how thermal stratification affects flow in and above urban street canyons [J]. Atmospheric Environment, 2000, 34: 1553–1562.CrossRefGoogle Scholar
  24. [24]
    XIE X M, LIU C H, LEUNG D Y C, et al. Characteristics of air exchange in a street canyon with ground heating [J]. Atmospheric Environment, 2006, 40: 6396–6409.CrossRefGoogle Scholar
  25. [25]
    KOVAR-PANSKUS A, MOULINNEUF L, SAVORY E, et al. A wind tunnel investigation of the influence of solar-induced wall-heating on the flow regime within a simulated urban street canyon [J]. Water, Air and Soil Pollution: Focus, 2002, 2(5/6): 555–571.CrossRefGoogle Scholar

Copyright information

© Shanghai Jiaotong University and Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Xiaomin Xie (谢晓敏)
    • 1
  • Zhongwei Zhu (朱中伟)
    • 1
  1. 1.School of Mechanical EngineeringShanghai Jiao Tong UniversityShanghaiChina

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