The characters of several diffusion models, which describe discharging and dispersion process of dangerous substances, have been analyzed. On the base of Gaussian plume and puff models selected, the software simulating the discharging and dispersion process of dangerous substances has been developed and the selection of parameters for the models has been discussed. The dispersion process and concentration distributions on the ground have been simulated through some examples. The reuslts of calculation indicate the validity of simulation. Distortion existing in the simulating of heavy or light gas influences the nicety of simulation.
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