Improvements to the EPA Industrial Source Complex (ISC) dispersion model
- National Oceanic and Atmospheric Administration, Research Triangle Park, NC (United States)
The Industrial Source Complex (ISC) model is a widely used and recommended model for a variety of regulatory applications as cited in the Guideline on Air Quality Models. This model was programmed in both a short-term hourly version (ISCST) and a long-term seasonal or annual version (ISCLT). The ISC model is a steady-state Gaussian plume model that can be used to assess nonreactive pollutant concentrations from a wide variety of source types that are associated with an industrial source complex. Modeling options include algorithms for calculating air pollution concentrations due to dry and wet deposition of particles; building downwash; and emissions from area, line and volume sources. The model can be obtained in electronic form from the US Environmental Protection Agency`s (EPA) Technology Transfer Network (TTN), Support Center for Regulatory Air Models (SCRAM) Bulletin Board System (BBS). To formally revise any regulatory model recommended in the guideline, such as the ISC model, several technical and regulatory steps must be taken. Included among these steps are public review and comment on the changes to the model put forth by EPA. Towards that end, EPA recently proposed in Supplement C to the Guideline that the ISC3 model replace the existing ISC2 model. The major changes to the short-term version of the ISC3 model, named ISCST3, include a revision to the area source algorithm, a surface pit retention algorithm, new dry and wet deposition algorithms, and a new meteorological data preprocessor. The purpose of this paper is to describe the nature of these changes.
- OSTI ID:
- 422988
- Report Number(s):
- CONF-960127--
- Country of Publication:
- United States
- Language:
- English
Similar Records
Consequence analysis for ISC-PRIME. Final report
Discussion of changes to the Industrial Source Complex (ISC) dispersion model user's guide--second edition