Road pollution analysis dynamic model (ropadym)

The pollutant diffusion adjacent to the motorway is strongly influenced by the vehicle induced turbulence. In spring 2001, turbulence measures were carried out in order to evaluate the phenomena intensity and range on the motorway from Mannheim to Heidelberg. It was found that the vehicle induced turbulence has more energy than the natural atmospheric turbulence until a distance of 40-50 meters from the motorway under particular meteorological conditions. Many attempts to create models and mathematical formulas for pollutant concentration distribution evaluations are found in the relevant technical literature. These limit the analysis to two dimensional urban U-sections without taking into account the vehicular transmitted energy to the air. The Road Pollution Analysis using the three dimensional Dynamic Models (ROPADYM). implemented with computational fluid dynamics (CFD) codes which take into account the vehicular motion and consequently the vehicular traffic induced Turbulent Kinetic Energy (TKE). With this approach more accurate pollutant distributions evaluations and predictions in the proximity of road infrastructures is done. This infrastructure can be urban or suburban, a U-section, a tunnel or a discontinuity (e.g. tunnel fornix). ROPADYM models are implemented with the “sliding mesh” technique that allows a faster calculation with a high level definition compared to adaptive mesh techniques. Case studies are worked out and a comparison is given with two dimensional classical approaches.