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Screening Models
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The models listed here are screening models that are usually applied before the refined air quality model to determine if refined modeling is needed. The models in this section include AERSCREEN, COMPLEX1, CTSCREEN, RTDM3.2, SCREEN3, TSCREEN, VALLEY, and VISCREEN.
| Screening Models |
| AERSCREEN AERSCREEN is the screening model for AERMOD. The model will produce estimates of regulatory design concentrations without the need for meteorological data and is designed to produce concentration that are equal to or greater than the estimates produced by AERMOD with a fully developed set of meteorological and terrain data. Model Code and Documentation EPA is currently working on a beta version of the code that will be released to the public as soon as possible. |
| COMPLEX1 COMPLEX1 is a multiple point source screening technique with terrain adjustment that incorporates the plume impaction algorithm of the VALLEY model. Model Code Executable (129KB,ZIP) Model Documentation User's Guide is presently not available Latest Model Change Bulletin |
| CTSCREEN CTSCREEN is a Gaussian plume dispersion model designed as a screening technique for regulatory application to plume impaction assessments in complex terrain. CTSCREEN is a screening version of the CTDMPLUS model. Model Code Readme/Executable/Test Case and Source Code (710KB,ZIP) with Extended Memory Executable Model Documentation User's Guide Supplement to User's Guide Report on Modifications to CTSCREEN and CTDMPLUS Notes on Terrain Input to CTDMPLUS and CTSCREEN (10KB,TXT) Latest Model Change Bulletin Model Tutorial Tutorial Documentation (155K,ZIP/WP5.1) Instructions for CTSCREEN Tutorial (3K,TXT) CTSCREEN Demonstration (420K,ZIP) CTSCREEN Model, File 1 (305K,ZIP) CTSCREEN Model, File 2 (329K,ZIP) Text editor file (48K,ZIP) Terrain data file (77K,ZIP) BUCKBERG Terrain data file (3K,TXT) ORIG Terrain data file (3K,TXT) CTDM Batch file (23,TXT) |
| RTDM3.2 Rough Terrain Diffusion Model (RTDM3.2) is a sequential Gaussian plume model designed to estimate ground-level concentrations in rough (or flat) terrain in the vicinity of one or more co-located point sources. Model Code Executable (106KB,ZIP) Model Documentation User's Guide is currently not available Latest Model Change Bulletin |
| SCREEN3 SCREEN3 is a single source Gaussian plume model which provides maximum ground-level concentrations for point, area, flare, and volume sources, as well as concentrations in the cavity zone, and concentrations due to inversion break-up and shoreline fumigation. SCREEN3 is a screening version of the ISC3 model. Model Code Readme/Code/Executable (176KB,ZIP) Model Documentation User's Guide Latest Model Change Bulletin |
| TSCREEN Toxics Screening Model (TSCREEN) is a Gaussian model that implements the procedures to correctly analyze toxic emissions and their subsequent dispersion from one of many different types of possible releases for superfund sites. It contains 3 models: SCREEN3, PUFF, and RVD (Relief Valve Discharge). Model Code Code/Executable/Test Case (1.6MB,ZIP) Model Documentation User's Guide TSCREEN Workbooks Latest Model Change Bulletin Model Tutorial Tutorial Documentation (86K,ZIP/WP5.1) Instructions for TSCREEN Tutorial(2K,TXT) TSCREEN Demonstration (579K,ZIP) TSCREEN Model, File 1 (253K,ZIP) TSCREEN Model, File 2 (382K,ZIP) TSCREEN Model, File 3 (568K,ZIP) |
| VALLEY VALLEY is a steady-state, complex terrain, univariate Gaussian plume dispersion algorithm designed for estimating either 24-hour or annual concentrations resulting from emissions from up to 50 (total) point and area sources. Model Code Code (76KB,ZIP) Model Documentation User's Guide is available from NTIS. Latest Model Change Bulletin |
| VISCREEN VISCREEN calculates the potential impact of a plume of specified emissions for specific transport and dispersion conditions. Model Code Executable (121KB,ZIP) Model Documentation Users Guide available from NTIS User's Guide Update Pages Latest Model Change Bulletin Model Tutorial Tutorial Documentation (486K,ZIP/WP5.1) Instructions for VISCREEN Tutorial (2K,TXT) VISCREEN Demonstration (1058K,ZIP) VISCREEN Model (71K,ZIP) |