Analytical Solutions of a Gradient-Transfer Model for Plume Deposition and Sedimentation

摘要

This report reviews the methods available in the literature for including dry deposition in a Gaussian plume model. A gradient-transfer or K-theory model for the atmospheric transport and ground deposition of gaseous and particulate pollutants emitted from an elevated continuous point source is outlined. The analytical plume diffusion-deposition solutions are presented for various stability and mixing conditions. The deposition model has been applied to particulate pollutants with appreciable settling velocity and to gases which deposit on ground without settling. Calculated results of ground-level concentration, vertical concentration profiles, surface deposition fluxes, and net deposition and suspension ratios are presented. The atmospheric stability and the magnitude of deposition velocity are shown to have significant effects on these results. The specification of gravitational settling and deposition velocities in the model is discussed.