Author(s)

A.G. Robins & J.E. Fackrell

Abstract

This paper describes a wind tunnel study of the behaviour of short duration emissions from a ground level source into a deep turbulent boundary layer. Ensemble averaged properties of the resulting clouds are compared with the predictions of similarity theory and the characteristic profile shapes of the along- wind, lateral and vertical mean concentration distributions are determined. Criteria for puff-like and plume-like behaviour are derived. The dependence of concentration fluctuations on position within a cloud, emission duration and time of travel is investigated. 1 Introduction Many operational and accidental emissions of hazardous material into the environment are of short duration with varying release rate. Considerable attention has been given to the 'dense gas cloud' problem and to continuous, st

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