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Dispersion modelling is needed to assess a population's risk of exposure to air pollution from local sources. A dispersion model describes the transport and diffusion of pollutants in the atmosphere. An example of the use of dispersion modelling is the assessment of the effect of a power station plume on a nearby town. Worst-case concentrations of pollutants can be estimated in various parts of the town, the general effect of the main chemical transformations can be conservatively estimated and an assessment of the population risk to exposure can be made. Common assumptions in simple dispersion models include very simple meteorology, simple representation of the effects of terrain and no chemical transformations.



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Types of dispersion models include Gaussian plume, puff and Lagrangian models. Regulatory models are of the former type. In this presentation, these models, the data requirements and outputs from some commonly used Australian models will be briefly described.



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Example of use of dispersion modelling is assessment of the effect of a power station on a nearby town.



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Plume cross-section, showing how AUSPLUME models the plume



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Shoreline fumigation modelled by DISPMOD



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AUSPLUME - Australian regulatory model



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Lagrangian models



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LADM - CSIRO Atmospheric Research model



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An example of LADM output



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TAPM - CSIRO Atmospheric Research 3-D model (more details at TAPM Web Page)



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