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Dispersion of atmospheric pollutants from point sources in a coastal environment

Rayner, Kenneth N. (1987) Dispersion of atmospheric pollutants from point sources in a coastal environment. PhD thesis, Murdoch University.

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Abstract

This Thesis describes work undertaken by the author as part of a Government sponsored study of air pollution dispersion from industrial sources at Kwinana, Western Australia. The primary objective of the study Ras to develop predictive tools, in the form of computer models which could be used in assessing air quality constraints on land use planning in the Kwinana area. A secondary objective Ras to develop models which could be adapted to apply to other areas of the State, both on the coast and inland.

The approach adopted to achieve these objectives Ras to identify those meteorological processes which significantly influence pollutant dispersion and to concentrate on developing conceptually simple, acceptably accurate model components which could be amalgamated into efficient, flexible an and robust dispersion model package. As far as possible, computation methods requiring only routinely available data were pursued, in view of the applications proposed for the model. The model components developed in the course of the study were:
(a) a model combining heat budget and bulk aerodynamic methods for computing surface turbulent fluxes, which requires routine single height meteorological data only and which accounts for the important stabilizing effect of surface evaporation;
(b) a model to describe the erosion of radiation inversions above a growing daytime well mixed layer, based on a parameterization of the turbulent kinetic energy budget of the layer;
(c) an efficient multi-source Gaussian plume dispersion model, incorporating simulation of the shoreline fumigation effect of elevated plumes entrained into a thermal internal boundary layer.

Each of these model components was successfully validated via comprehensive field experiments, which are described in the Thesis. The dispersion model displayed excellent accuracy in predicting daily or longer averages of sulphur dioxide measurements at a continuous monitoring station, but tended to under-predict high hourly averages.

The development and implementation of the above model components to simulate the various meteorological processes over a full twelve month period (with a ten minute timestep) for a very modest computing cost is considered to be a significant contribution to this field of study.

Item Type: Thesis (PhD)
Murdoch Affiliation: School of Environmental and Life Sciences
Notes: Note to the author: If you would like to make your thesis openly available on Murdoch University Library's Research Repository, please contact: repository@murdoch.edu.au. Thank you.
Supervisor(s): Lyons, Tom
URI: http://researchrepository.murdoch.edu.au/id/eprint/51348
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