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 f low and pollution levels under neutral atmospheric conditions. The mod el is based on the numerical solution of the time-averaged Navier-Stok es equations written in their contravariant strong conservation form i n a generalized non-orthogonal co-ordinate system. Before its applicat ion to the Athens Basin case, the reliability of the model was tested by predicting the flow and concentration fields over a three-dimension al hill. The predicted results agree favourably with available experim ental data, demonstrating the validity, flexibility and economy of the model for flows in three-dimensional complex terrain.