Inderscience Publishers

Comparison of predictions of the Hybrid Plume Dispersion Model with observations at the Kincaid power plant

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Courtesy of Inderscience Publishers

The Hybrid Plume Dispersion Model (HPDM) has been evaluated with observations from a field experiment at the Kincaid power plant. HPDM is a dispersion model for buoyant plumes that employs parameterisations of boundary-layer wind, temperature, and turbulence profiles and Lagrangian time-scales. The model accounts for the bimodal distribution of turbulent velocities in the convective boundary layer and contains an algorithm for calculating the lofting of a buoyant plume against a capping inversion. The model predictions of maximum plume centreline concentrations show a mean bias of less than l0%, a typical error that is about 50% of the mean, and a correlation of about 0.5.

Keywords: atmospheric diffusion, model evaluation, plume rise, plume dispersion, power plants, atmospheric dispersion models, environmental impact assessment, buoyant plumes, modelling, turbulent velocities, convective boundary layer, environmental pollution, air pollution

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