Journal article
CONCENTRATION FLUCTUATIONS IN DISPERSING TRACER PLUMES
Boulder
1985
DOI:
https://doi.org/10.7273/000007811
Abstract
Turbulent diffusion theory for atmospheric plumes has focused almost entirely upon observations and predictions of mean concentrations. Recently, interest has increased in the nature of short-term concentrations as related to the diffusion of toxic and flammable materials or smoke. A number of wind-tunnel studies (Fackrell and Robins, 1982a,b; Wilson et al., 1982a,b) and a very few field studies (Hanna, 1984a; Jones, 1979; Sawford et al., 1985) have been conducted where concentration variance, probability density functions, and plume intermittency factors were obtained for simple situations. Hanna (1984a) summarized the nature of these plume parameters as follows: 1) the intensity of concentration fluctuations, cr /c, is of order unity near the plume centerlin~ and of order 10 near the plume edge; 2) plume intermittency, I, defined as the fraction of time that non-zero concentrations occur, ranges from 0.5 near the plume axis to less than 0.1 near the mean plume edges for small downwind distances; and 3) an exponential probability density function is a valid distribution for short-term concentration fluctuation data.
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Details
- Title
- CONCENTRATION FLUCTUATIONS IN DISPERSING TRACER PLUMES
- Creators
- Brian K Lamb (Author) - Washington State University, Department of Civil and Environmental EngineeringHolly Peterson (Author)Malcolm J. Campbell (Author) - Ithaca College
- Publication Details
- Boulder
- Academic Unit
- Laboratory for Atmospheric Research
- Identifiers
- 99901320137401842
- Language
- English
- Resource Type
- Journal article