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 obser vations from a field experiment at the Kincaid power plant. HPDM is a dispersion model for buoyant plume's that employs parameterizations of boundary-layer wind, temperature, and turbulence profiles and Lagrang ian time-scales. The model accounts for the bimodal distribution of tu rbulent velocities in the convective boundary layer and contains an al gorithm for calculating the lofting of a buoyant plume against a cappi ng inversion. The model predictions of maximum plume centreline concen trations show a mean bias of less than 10%, a typical error that is ab out 50% of the mean, and a correlation of about 0.5.