Lionel Soulhac

Influence of Meteorological Input Parameters on Urban Dispersion Modelling for Traffic Scenario Analysis

The aim of this study is to evaluate the results from using parallel observation and numerical weather prediction data as inputs to the urban dispersion model SIRANE applied to traffic scenarios of NOX in the city of Florence. A detailed sensitivity analysis of the air quality modelling system against measurements from monitoring stations of the city of Florence has been carried out in order to identify the advantage and disadvantages of the use of meteorological observation and numerical weather prediction data.

Wind Tunnel Study of the Exchange Between a Street Canyon and the External Flow

In the last three decades, in order to model pollutant dispersion inside a street canyon, several models have been proposed to describe mean concentration and retention time of pollutant inside the canyon, in function of the flow dynamics of the external flow (Berkowicz, 2000, Soulhac, 2000, De Paul and Sheih, 1986, Caton et al., 2003). Some of these models take account just of the mean velocity at the roof height Uh, some other do also consider the turbulence intensity of the incoming flow. The aim of this study is to evaluate how different conditions of the external flow induce different velocity field inside the canyon, and to find an appropriate velocity and length scale to characterize the mass exchange between the recirculating region and the external flow.