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A wind tunnel study of mean and fluctuating concentrations in a plume dispersing over a two-dimensional hill

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Abstract

This paper describes an experimental investigation of the behaviour of the statistics of concentration fluctuations in a passive plume dispersing over a two-dimensional hill of moderate steepness. Recently developed high frequency response Flame Ionization Detector (FID) technology with a frequency response in excess of 200 Hz was utilized to obtain an extensive set of measurements of the mean and fluctuating plume concentrations. Plumes dispersing over flat terrain and over a hill with a maximum slope of 0.3 were studied. For both cases, extensive turbulent flow measurements were also carried out.

The measured mean plume concentration profiles were of a generally Gaussian form and showed the expected effects of surface reflection for the flat terrain and hill. Plume intermittency and concentration fluctuation intensity were calculated at all measurement locations. Conditional and unconditional plume concentration statistics were calculated. The conditional (in-plume) concentrations and intensities were more uniform with height than for the unconditional ones.

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Authors and Affiliations

  1. The Boundary Layer Wind Tunnel Laboratory, The University of Western Ontario, London, Ontario, Canada

    Gregory Crooks & Stephen Ramsay

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  1. Gregory Crooks
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  2. Stephen Ramsay
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Crooks, G., Ramsay, S. A wind tunnel study of mean and fluctuating concentrations in a plume dispersing over a two-dimensional hill. Boundary-Layer Meteorol 66, 155–172 (1993). https://doi.org/10.1007/BF00705464

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  • DOI: https://doi.org/10.1007/BF00705464

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