Traffic-Induced Urban Pollution: A Numerical Simulation of Street Dispersion and Net Production

  • Jean-François Sini
  • Patrice G. Mestayer
Part of the NATO • Challenges of Modern Society book series (NATS, volume 22)

Abstract

The CFD model CHENSI, based on the k-e two equation closure, including thermal buoyancy and scalar transport-diffusion, is first used to simulate the experiment of Cadle et al. (1976), allowing to deduce the turbulence produced by car motion. Then, a heuristic study of the streets capacity to ventilate the pollutants emitted by traffic, as a function of their geometrical and thermal properties, is presented from simulations of the flow and turbulent fields, the pollutant concentrations within the streets, and their fluxes to the atmosphere. Isothermal and non-isothermal simulations are presented, in the case when the street geometry corresponds in isothermal conditions to Oke’s (1988) skimming flow type. The wall heating is shown to induce different types of flow resulting in different pollutant distributions and net fluxes. The influence of the turbulence produced by cars on the pollutant dispersion is shown.

Keywords

Street Canyon Wall Heating Urban Canopy Pollutant Dispersion Traffic Rate 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. Bottema, M. & J.-F. Sini, 1997, High-Schmidt number mass transfer through turbulent gas-liquid interfaces, 11th Symposium on Turbulent Shear Flows, Grenoble, France.Google Scholar
  2. Cadle, S.H., D.P. Chock, J.M. Heuss and P.R. Monson, 1976, Results of the General Motors sulfate dispersion experiment, GM Research Publication GMR-2107, GM Research Laboratories, Warren, MI.Google Scholar
  3. Cadle, S.H., D.P. Chock, P.R. Monson and J.M. Heuss, 1977, General Motors sulfate dispersion experiment: Experimental procedures and results, J. Air Pollution Control Assoc. 27: 33.CrossRefGoogle Scholar
  4. Chock, D., 1977, General Motors sulfate dispersion experiment-An overview of the wind, temperature, and concentration fields, Atmospheric Environment 11: 553CrossRefGoogle Scholar
  5. Costes, J.-P., 1996, Simulations numériques des écoulements atmosphériques sur sols fortement hétérogènes, Thèse de Doctorat, Ecole Centrale de Nantes, France.Google Scholar
  6. Delaunay, D., J.P. Flori, C. Sacre, 1996, Numerical Modelling of gas dispersion from road tunnels in urban environments: comparison with field experiment data, 4th Workshop on harmonisation within atmospheric dispersion modelling for regulatory purposes, Oostende, Belgium: 361.Google Scholar
  7. Eskridge, R.E. and J.C.R. Hunt, 1979, Highway modeling. Part I: Prediction of velocity and turbulence fields in the wake of vehicles, J. Applied Meteorology 18: 387.CrossRefGoogle Scholar
  8. Joumard, R. and J. Lambert, 1991, Evolution des emmissions de polluants par les transports en France de 1970 a 2010, Rapport INRETS n° 143.Google Scholar
  9. Levi Alvares, S., 1991, Simulation numérique des écoulements urbains à l’échelle d’une rue à l’aide d’un modèle k-ε., Thèse de Doctorat, Université de Nantes-ENSM, France.Google Scholar
  10. Mestayer, P.G., J.-F. Sini and M. Jobert, 1995, Simulation of the wall temperature influence on flows and dispersion within street canyons, 3rd Int. Conference on Air Pollution, Porto Carras, Greece, 1: 109.Google Scholar
  11. Mestayer, P.G., M. Bottema, J.-P. Costes, J.-F. Sini, 1996, Modelling urban canopy and terrains for transport-diffusion simulations at sub-mesoscales, 4th Workshop on harmonisation within atmospheric dispersion modelling for regulatory purposes, Oostende, Belgium: 337, to appear in Int. J. Environm. Pollution 6.Google Scholar
  12. Sacré, C., 1996, Modélisation de la turbulence induite par le traffic automobile, CSTB report EN-CLI 96.21 C., CSTB Nantes, France.Google Scholar
  13. Sedefian, L., S. Trivikrama Rao and U. Czapski, 1981, Effects of traffic-generated turbulence on near-field dispersion, Atmospheric Environment 15: 527.CrossRefGoogle Scholar
  14. Sini, J.-F., S. Anquetin and P.G. Mestayer, 1996, Pollutant dispersion and thermal effects in urban street canyons, Atmospheric Environment, Urban Atmosphere, 30: 2659.CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media New York 1998

Authors and Affiliations

  • Jean-François Sini
    • 1
  • Patrice G. Mestayer
    • 1
  1. 1.Laboratoire de Mécanique des Fluides, UMR CNRS 6598 and SUB-MESOGroupement de Recherches CNRS 1102 Ecole Centrale de NantesNantesFrance

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