FURTHER DEVELOPMENT OF A MODEL FOR DENSE GAS DISPERSION OVER REAL TERRAIN

This paper addresses the development of a computer-based mathematical model for the prediction of the dispersion of dense gas. The basic mod el for dispersion over flat terrain is outlined and its performance is illustrated by comparison with a range of field trial information. It is then shown how a number of separate algorithms for the effects of obstacles on dispersion can be combined into a single algorithm that c an be applied to enable predictions to be made for dispersion over a t ypical industrial site. The complete model is then compared with resul ts from a more limited range of field trial and wind tunnel experiment s. The paper ends with a discussion on both the usefulness and also th e limitations of this approach.