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- Title
A Concentration pdf for the Relative Dispersion of a Contaminant Plume in the Atmosphere.
- Authors
Munro, R. J.; Chatwin, P. C.; Mole, N.
- Abstract
Observations of the dispersion of a contaminant plume in the atmospheric boundary layer, obtained using a Lidar, are analysed in a coordinate frame relative to the instantaneous centre of mass of the plume. To improve the estimates of relative dispersion statistics, maximum entropy inversion is used to remove noise from the Lidar concentration profiles before carrying out the analysis. A parametric form is proposed for the probability density function (pdf) of concentration, consisting of a mixture of a beta distribution and of a generalised Pareto distribution (GPD). This pdf allows for the possibility of a unimodal or bimodal distribution, and is shown to give a satisfactory fit to observations from a range of positions relative to the source. The variation of the fitted parameters with crossplume location is analysed, and the maximum possible concentration is found to decrease away from the plume centre.
- Subjects
POLLUTANTS; ENTROPY; DENSITY; OPTICAL radar; PROBABILITY theory
- Publication
Boundary-Layer Meteorology, 2003, Vol 106, Issue 3, p411
- ISSN
0006-8314
- Publication type
Article
- DOI
10.1023/A:1021209622648