Author(s)

D. Boucoulava, M. Tombrou, C. Helmis & D. Asimakopoulos

Abstract

Nocturnal drainage flows in Megalopolis valley are simulated by a two dimensional vertically averaged dynamic model. The calculated wind field is compared with hourly observations taken at four stations situated in the central part of the valley. Ground level concentrations of SC>2 which is emitted from the stacks of a Power Plant are also estimated. 1 Introduction Nocturnal drainage flows are a very common feature of mountainous regions. Cooling by nocturnal radiation causes the layer of the air adjacent to the slope to be cooled by conduction and turbulence. The temperature difference between this layer and the ambient air at the same altitude over the centre of the valley causes buoyant forces generating a complex circulation which can

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