Record Display for the EPA National Library Catalog


OLS Field Name OLS Field Data
Main Title Comparison of ISC2 dry deposition estimates based on current and proposed deposition algorithms.
Author Bailey, D. T.
Other Authors
Author Title of a Work
Bailey, Desmond T.
CORP Author Environmental Protection Agency, Research Triangle Park, NC. Office of Air Quality Planning and Standards.
Publisher Office of Air Quality Planning and Standards, U.S. Environmental Protection Agency,
Year Published 1994
Report Number EPA-454/R-94-018
Stock Number PB94-209491
OCLC Number 30994733
Additional Subjects Dry methods ; Deposition ; Particulates ; Mathematical models ; Air pollution ; Study estimates ; Comparison ; Algorithms ; Particle size ; Plumes ; Pollution sources ; Meteorology ; Stacks ; Atmospheric diffusion ; Tables(Data) ; Graphs(Charts) ; Industrial Source Complex dispersion model ; ISC2 Model
Internet Access
Description Access URL
Library Call Number Additional Info Location Last
EJBD ARCHIVE EPA 454-R-94-018 Headquarters Library/Washington,DC 08/31/2010
EKAM  EPA-454/R-94-018 Region 4 Library/Atlanta,GA 09/30/1994
EKBD  EPA-454/R-94-018 Research Triangle Park Library/RTP, NC 09/02/1994
ESAD  EPA 454-R-94-018 Region 10 Library/Seattle,WA 03/23/2010
NTIS  PB94-209491 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. 01/01/1988
Collation 1 v. (various pagings) : ill. ; 28 cm.
The ability to accurately estimate deposition of particulate matter is of special concern in assessing environmental impacts from a variety of sources including Superfund sites, municipal waste incinerators, and surface coal mines. The current deposition algorithm in ISC2 simulates deposition as the movement of particles toward the surface by the combined processes of atmospheric turbulence and gravitational settling. The method was developed for applications to large particles dominated by gravitational settling; these are typically particles greater than 20 micrometers diameter. The current algorithm was not intended for use with particles smaller than about 20 micrometers which are often of concern in air toxics assessments. In light of this limitation, a new deposition algorithm is being considered for use in ISC2. The proposed algorithm is intended to simulate processes important over the entire range of significant particle sizes (0.1 to 100 micrometers). The proposed algorithm employs a deposition velocity based on a resistance model. In this approach, deposition flux is calculated as the product of the near-surface air concentration and the deposition velocity. The latter is computed as the inverse sum of the aerodynamic layer and deposition layer resistances, plus gravitational settling. The new deposition algorithm has been tested within the framework of the ISC2 model and comparisons of deposition estimates using the old (current) and new deposition algorithms have been made for a range of source types and particulate emission scenarios. Similar comparisons have been made of particulate concentration estimates as affected by the old and new deposition algorithms.
Author: Desmond T. Bailey. "July 1994." Includes bibliographical references (p. 13-13a) and appendices.