Oturanç G.Özbalta N.Güngör A.2020-03-262020-03-2620020363907Xhttps://dx.doi.org/10.1002/er.768https://hdl.handle.net/20.500.12395/18132A 3D Lagrangian particle model has been presented for the atmospheric dispersion of the toxic pollutants released from industrial stacks. As the mean wind speed and direction is changed with height in a real atmosphere, the height of the exhaust stack may have a strong impact on the pollutant dispersion and ground concentrations. An elevated continuous release of non-buoyant gas in a neutrally stratified atmosphere has been simulated, for various stack heights. The turbulent atmospheric parameters like vertical profiles of fluctuating wind velocity components and eddy lifetime were calculated using a semi-empirical mathematical model. The numerically calculated horizontal and vertical dispersion coefficients (?y and ?z) are compared with the Pasquill's empirical ?'s. The ground concentration as a function of downwind distance has been compared with the Green glow data. The ground concentrations for various release heights were compared with the Gaussian plume model. The comparison indicated a need for using either a modified Gaussian model or a 3D numerical mathematical model for pollutant dispersion and ground concentration calculations. Copyright © 2002 John Wiley & Sons, Ltd.en10.1002/er.768info:eu-repo/semantics/openAccessAtmospheric dispersionComplex topographyFlow modellingLagrangian modelNumerical modellingTrajectory modelArticle26293104N/A