Dispersion in a street canyon for a wind direction parallel to the street axis |
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Authors: | L. Soulhac |
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Affiliation: | Laboratoire de Mécanique des Fluides et d’Acoustique, Université de Lyon CNRS, École centrale de Lyon, INSA Lyon, Université Claude Bernard Lyon I 36, avenue Guy de Collongue, 69134 Ecully, France |
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Abstract: | We investigate pollutant dispersion in a street canyon for an external wind direction parallel to the street axis, a case which has been poorly documented in the literature. The study is performed numerically and analytically by means of a model based on a series of simplifying assumptions. The range of validity of these assumptions is discussed by comparing analytical and numerical results for two different street aspect ratios. Our results show that, for a critical length of the street, ground level concentration can be higher than those observed in a street canyon whose axis is perpendicular to the external wind direction. We show that this critical length depends on the street aspect ratio. |
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Keywords: | Street canyon Pollutant dispersion Analytical model Urban canopy flow |
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