DISPERSION UNDER NEUTRAL ATMOSPHERIC CONDITIONS

A recently developed mesoscale numerical model has been applied to the Athens Basin in order to provide a detailed description of the mean flow and pollution levels under neutral atmospheric conditions. The model is based on the numerical solution of the time-averaged Navier-Stokes equations written in their contravariant strong conservation form in a generalized non-orthogonal co-ordinate system. Before its application to the Athens Basin case, the reliability of the model was tested by predicting the flow and concentration fields over a three-dimensional hill. The predicted results agree favourably with available experimental data, demonstrating the validity, flexibility and economy of the model for flows in three-dimensional complex terrain.