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