On the Application of a Lagrangian Particle–Puff Model to Elevated Sources in Surface Layers with Neutral Stability

Abstract

A Lagrangian particle?puff model is presented for predicting the statistical properties of tracers dispersing from elevated sources into surface layers with neutral stability. The model is based upon F. A. Gifford?s meandering-plume concept and includes a Lagrangian stochastic model for treating plume meander caused by large turbulent eddies. Model predictions for mean concentrations, root-mean-square fluctuating concentrations, and intermittency factors are shown to be in fair agreement with experimental data for compact-area and line sources.