Misura e mitigazione dell’impatto ambientale da traffico veicolare in galleria

The volumes of a road tunnel including the tunnel exits, affected by the plume effect were analysed by an original numerical simulation model named RO.P.A.DY.M. (ROad Pollution Analysis DYnamic Model). This model was developed by taking into account the fluid-dynamic effects of road-vehicle motion in order to carry out the map of atmospheric pollutant concentrations within the foregoing volumes in near-to-real conditions. With the use of an innovative CFM method (Control Function Method) an objective measure of the environmental impact of road traffic for the foregoing volumes was obtained. The introduction of air-cleaning active systems in the tunnel and at the exits was considered. With the application of the ROPADYM model pollutant concentration maps were produced for the volumes considered in the tunnel, taking into account the cleansing systems. In conclusion, a quantitative evaluation of the effects obtained from the application of these active systems was formulated. This evaluation is expressed for the reduction in both pollutant concentrations and environmental impact.