H14-137 EVALUATION OF AIR POLLUTANT CONCENTRATIONS ESTIMATED INSIDE AN ASYMMETRIC STREET CANYON USING DIFFERENT PARAMETERISATIONS OF VEHICLE-INDUCED TURBULENCE

Leeward air pollutant concentrations (C) are estimated by incorporating different parameterisations of traffic-produced turbulence (TPT) into the scaling of C inside a street canyon. Four cases are evaluated. Three of them consider TPT parameterisations previously introduced in literature by other authors, based on a theoretical formulation of TPT and a semi-empirical approach of the generation of turbulence by moving cars already incorporated in an operational street model. The fourth scheme introduces an empirical expression of TPT derived from four full-scale street canyon data sets. Hourly NOx concentrations are calculated for an asymmetric street canyon in Buenos Aires, using meteorological observations at local airport and modelled background concentrations. Statistical indicators show that the performance of the four schemes is satisfactory.