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.
AFTOX was developed to model neutrally buoyant gas releases and liquid spills that evaporate to a neutrally buoyant gas. Gas releases are limited to those that are neutrally buoyant (non-dense, non-buoyant) with no velocity, and emanating from a point (non-area) source. Liquid spills are limited to single-phase releases of low volatility liquids.
Industrial chemicals, highly-toxic chemicals, and emergency response planning applies to a wide range of accidental release scenarios and process analysis.
Typical Users
The typical BREEZE AFTOX user includes:
- Plant managers
- Emergency planner
- Process analyst
- PR staff
- Plant-level EH&S
- Students and researchers