Author(s)

A. Butet

Abstract

Chemical releases are particulary dangerous when occuring under meteorological conditions such as stable thermal stratification and light wind as defined by a small Froude number. The consequences of such releases are even worse when the source is situated near hills or mountains. At small Froude number, the buoyancy forces control the flow dynamics and prevent the flow from passing over the hill. In order to describe these phenomena and to validate a non-hydrostatic numerical model (Meso-NH), Meteo-France has taken part in a multidisciplinary study (PRIMEQUAL) on the city of Toulouse. This paper presents the field measurements performed in the winters 1995 and 1996 with an automatic weather stations network and a radiosounding to select and define the stratified meteorological con

Keywords