Author(s)

F. Bompay & L. Borrel

Abstract

Media: improvement of the source term treatment F. Bompay, L. Borrel Mefeo France, 6'CEM/06V16', Tb^/o^^e, France ABSTRACT MEDIA is an Eulerian three dimensional model of atmospheric dispersion, used at the present time by METEO-FRANCE to forecast the behaviour at middle and large scale, of an atmospheric release of pollutant. In this model, the source is described on the horizontal plan by a Gaussian distribution between the point of release and the 12 closest grid points.This scheme does not take into account the wind. In this paper we shall study six possible modifications of the source-mesh, in order to reduce the present drawbacks. the first four will consist in reducing the number of points that modelize the source so that computing by MEDIA (which takes account of the meteorological fields) will step in as soon as possible. In the last two ones we shall take into account the wind in order to reduce the concentration of pollutant upstream from the source,

Keywords