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AFTOX can be used to model the impacts from point, area, and liquid spill
sources. For each source type, the release can be continuous, finite, or
instantaneous in duration. For liquid spills, AFTOX can calculate the
evaporation rate from the pool using one of three evaporation models (Vossler,
Shell, or Clewell), in addition to providing the downwind plume concentrations.
For each release, AFTOX assumes the plume distribution is Gaussian in the
downwind and crosswind directions. The model uses Pasquill-Gifford dispersion
coefficients with modifications to account for a user-specified averaging time. |
