Dependence of street canyon concentrations on above-roof wind speed - implications for numerical modelling Online publication date: Mon, 14-Jul-2003
by M. Ketzel, R. Berkowicz, W.J. Muller, A. Lohmeyer
International Journal of Environment and Pollution (IJEP), Vol. 17, No. 4, 2002
Abstract: For microscale numerical modelling of street canyon air pollution, the traffic-related component of the total ambient pollutant concentration is often assumed to be inversely dependent on the wind-speed at rooftops for idealised conditions of neutral stratification, no solar radiation, and no traffic-induced turbulence. Detailed data analyses of two comprehensive datasets from Gottinger Strase (Hannover) and Jagtvej (Copenhagen), including concentration and wind-field measurements in the street and above the rooftops, are presented to test these idealised assumptions, and to improve numerical modelling for a wider range of conditions. The experimental results show systematic deviation from the idealised inverse wind-speed law, when rooftop wind-speeds were less than 10 m/s. It was found that turbulence associated with traffic is a parameter, which is increasingly important for lower wind-speeds.
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