Author(s)

J.I. Ibarra

Abstract

Atmospheric dispersion under local valley breeze conditions during the Guardo experiment J.I. Ibarra ABSTRACT During the Guardo experiment carried out in Spain during November 1990, local valley wind systems were observed frequently, that strongly influenced elevated releases from a 185m stack height. Simultaneous SF./SCU were programmed to characterize diffusion patterns within a study domain of 40x40 km. A numerical simulation with models MATHEV/ADPIC is presented for a typical up-valley flow. A complex three-dimensional structure is modelled for the breeze condition selected which shows a good agreement with experimental observations. The elevated plume interacts with a stable, subsidence layer some 450m aloft at a distance not far beyond 2km from the source. Then, the upper part of the plume makes a =90" shift being transported at an average height of 400m by the influence of moderate mesoscale winds, while the bottom part of the plume is projected downwards and ch

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