PUFFY: A Puff Diffusion Computer Model (PUFFY: Datormodell foer Puffdiffusion)

摘要

The impact of the downwind transport and distribution of different kinds of emissions to the atmosphere has become increasing important in hazard evaluation studies. The need to understand the distribution of chemical agents, smoke, and other toxic substances are essential for precautionary and defense planning. The dispersion of such atmospheric pollutants can be predicted with a puff model, which gives a reasonably simple method to be used in routine applications. The puff model PUFFY is an alternative to the Gaussian plume model to simulate dispersion in the atmosphere on a mesoscale range. Plume dispersion is calculated using consecutive gas clouds or puffs with Gaussian concentration distribution. PUFFY gives the user the possibility to make concentration computations with contributions from multiple sources in a variable wind field. Wind observation time series from multiple sites can be applied to compute a two-dimensional flow field. The wind field is calculated using a 1/sq r-interpolation scheme. Outputs from the model PUFFY are in the form of time dependent concentration fields, wind fields and puff position records. The files can be evaluated using graphics.