ERT visibility model, version 4.1 (for microcomputers). Model-Simulation
Technical Report
·
OSTI ID:270100
The ERT Visibility Model has been developed to estimate, principally for regulatory purposes, plume blight and visibility impairment resulting from point sources. The model combines the concentration fields calculated from single- or multiple-source dispersion models with calculations of the radiative transfer at four wavelengths in the visual range. It accounts for the scattering and/or absorption of the reactive pollutants NO2, NO3, SO4, and carbonaceous and non-carbonaceous TSP. It can consider any geometrically specified line of sight (e.g., to a specific vista from a point in a Class I area). The model gives the following information about plume blight visibility degradation: (1) visual range reduction; (2) plume contrast; (3) object contrast degradation; (4) plume discoloration, expressed as a blue/red intensity ratio and (5) object and sky discoloration, expressed as a Delta E value. The ERT Visibility Model (Version 4.1) has been developed by the Air Quality Studies Division of ENSR Corporation. This model is listed in Appendix B of the U.S. EPA`s `Guideline on Air Quality Models (Revised) (EPA-450-2/78- 027R) (PB95-246401) as a refined model that may be considered on a case-by-case basis for individual regulatory applications. The model is available as a refined modeling technique for Level-3 plume visibility impairment analyses for PSD Class I areas as discussed in the U.S. EPA`s `Workbook for Plume Visual Impact Screening and Analysis` (EPA-450/4-88-015) (PB89-151286). The ERT Visibility Model has undergone substantial testing and evaluation.
- Research Organization:
- ENSR Consulting and Engineering, Acton, MA (United States)
- OSTI ID:
- 270100
- Report Number(s):
- PB--96-501978/XAB
- Country of Publication:
- United States
- Language:
- English
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