Author(s)

C. Guilbaud, S. Anquetin & J.P. Chollet

Abstract

Transport and evolution of urban pollution in deep valleys C. Guilbaud, S. Anquetin, J.-P. Chollet Laboratoire des Ecoulernents Geophysiques et Grenoble Cedex 9, France ABSTRACT This study is devoted to a better comprehension of the pollutant transport and diffusion mechanisms in cities located in valleys. A code is developed on the basis of ARPS (University of Oklahoma), a 3D non hydrostatic model with fully compressible equations. Tests are carried out on a 2D isolated hill for different atmospherical stratifications. Then, we have simulated the effects of an alpin val- ley topography on the flow generated by radiative cooling/ warming of the slopes. The transport of the non reactive pollutant emitted at the center of the valley. INTRODUCTION Air pollution in cities located in deep valleys is mainly due to intense photo- chemical episodes, leading to high ozone concentrations. Ozone is an oxydant and can be very dangerous for humain beings, plants an

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