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Numerical Simulation of the Air Pollution Dispersion to the Neighboring Regions of Traffic Tunnel Portals

Nemati Mehr, Mahdi | 2013

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 44662 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Afshin, Hossein; Hosseini, Vahid
  7. Abstract:
  8. By expansion of urban areas and increasing in number of vehicles commuting, tunnels are one of the most inevitable part for developing urban areas. Nevertheless, one of the important topics about tunnels is exhaustion of polluted air into its surroundings. Tohid Tunnel, stretching about 2136 meter, is currently the longest urban tunnel in Iran, connecting Chamran and Navvab Highway from north of Fatemi street, to the Shokufeh street. Now, exhausting pollutants is done only by north and south portals beside a middle shaft. The purpose of this project is to analyze pollutant dispersion from south portal of Tohid tunnel which is located in Navvab residential region. This is done by considering the effect of atmospheric and thermal conditions over the amount and form of dispersion of pollutants. Studies have shown that the temperature of exhausts from the tunnel portal can be reach up to 60°C. Such a temperature range can cause difference in the density, and consequently results natural circulation of air which will play a significant role in pattern of pollutant dispersion. Similarly, altitudinal air temperature profile, is one of the active parameters as well (Inversion vs. normal condition). In this study the effect of the mentioned temperature profile will be investigated which was neglected from similar projects
  9. Keywords:
  10. Urban Traffic Tunnel ; Street Canyon ; Inversion Condition ; Tohid Tunnel

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