Abstract
This paper reviews fifteen current mathematical models for the dispersion of accidental releases of heavy gases until they dilute with air to non-flammable or non-toxic concentrations. The models are broadly classified into K-theory models (5 in number) and slab models (10 in number). In addition, 4 jet release models are given that can describe elevated releases of heavy gases.For each model, a description is given of the mechanistic features claimed, the applicability to differing types and geometries of release, the ease of availability to users, and the degree to which calculated results have been compared with field data. To facilitate comparison, these characteristics are listed in a common tabular form for each model.
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