Heterogeneous Traffic Induced Effects on Vertical Dispersion Parameter in the Near Field of Roadways - a Wind Tunnel Study |
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Authors: | M Khare KK Chaudhry RMM Gowda K Ahmad |
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Institution: | (1) Department of Civil Engineering, Indian Institute of Technology, Delhi, 110 016, India;(2) Department of Applied Mechanics, Indian Institute of Technology, Delhi, India |
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Abstract: | The varying traffic parameters such as traffic volume, speed, shape and size, and terrain roughness conditions play a vital
role on dispersion of pollutants in the near field of roadways. Simulation experiments were carried out in the Environmental
Wind Tunnel (EWT) to evaluate the traffic induced effects on vertical dispersion parameter (σ
z
) for heterogeneous traffic conditions in the near field of roadways for evaluating the effect of variations in traffic volume,
terrain roughness condition and approaching wind direction. The model vehicle movement system was fabricated and made operational
in the EWT, which allowed the variation in traffic volume, speed and wind road inclination. Sixty-six hydrocarbon tracer experiments
were performed to evaluate σ
z
in the near field of roadways for variable traffic volume, three terrain roughness conditions and two approaching wind directions
(i.e., 90° and 60°). The values of σ
z
for heterogeneous traffic conditions were found to be higher for low roughness conditions in comparison to other two higher
roughness conditions for various traffic volumes and approaching wind directions.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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Keywords: | EWT line source vertical dispersion parameter heterogeneous traffic |
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