Numerical simulation traffic-related air pollution: Effect of horizontal wind shear

The concentration of emissions related to trafic in urban areas is influenced by meteorological factors, particularly horizontal wind shear and the temporal and spatial dependence of wind velocity magnitude. We have developed a two-dimensional mathematical model to address the trafic flow/pollution coupled problem, where pollution source is generated by the density of vehicles. Its numerical solution is calculated using an algorithm that combines the Lagrange Galerkin method for spatial discretization and the Characteristic method for temporal discretization. A single direction and varying wind velocity magnitudes are examined in order to determine how the presence of an obstacle affects the distribution of pollutant concentration in a bifurcation topology trafic. We have also studied the temporal evolution of pollutant concentration at several pertinent locations within the domain for two wind velocities. Different transport pollution regimes have been observed depending on time and wind direction.