Abstract
Abstract Lagrangian particle models have been used successfully in dispersion studies for over a decade. With the ever-increasing speed of computers, the technique has increased in use due to its good performance in complex meteorological conditions. However, the method needs significant computer resources usually a supercomputer, to obtain statistically meaningful solutions of pollutant dispersion and mean concentration for sources in typical air sheds. The particle-puff (PARTPUFF) method proposed here uses a Gaussian puff solution in the horizontal directions and a particle solution for the vertical coordinate. This method allows a particle/puff to influence more than one horizontal grid point and so the total number of particles needed for a model run is reduced. The dispersion simulation still accounts for height-varying values of winds and turbulence in the same way as conventional particle models. The approach developed here has been verified by comparing results with a full particle model for the s...
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