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RECORD NUMBER: 33 OF 279

Main Title Climatological Dispersion Model (CDM 2.0) (for Microcomputers).
CORP Author Environmental Sciences Research Lab., Research Triangle Park, NC. Meteorology and Assessment Div.
Publisher Feb 97
Year Published 1997
Stock Number PB97-501480
Subjects Models-simulation; Software; Air pollution sources; Gaussian plume models; Point sources; Area sources; Plumes; Wind direction; Wind velocity; Stability; Downwash; Air pollution dispersion; Ecological concentration; Diffusion modeling; Rural areas; Urban areas; Spatial distribution; Algorithms; Diskettes; CDM model; Climatological Dispersion Model; Emission rates
Holdings
Library   Call Number Additional Info Location Date Modified
NTIS PB97-501480 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 05/16/1997
Collation 1 diskette
Abstract Program determines long-term (seasonal or annual) quasi-stable pollutant concentrations in rural or urban settings using average emission rates from point and area sources and a joint frequency distribution of wind direction, wind speed, and stability. The Gaussian plume hypothesis forms the basis for the calculations. Contributions are calculated assuming the narrow plume hypothesis, and involve and upwind integration over the area sources. Computations can be made for up to 200 point source sand 2500 area sources at an unlimited number of receptor locations. The number of point and area sources can be easily modified within the code. CDM2.is an enhanced version of CDM and includes the following options: 16 or 36 wind-direction sectors; stack-tip downwash; and gradual (transitional) plume rise. The user has a choice of seven dispersion parameter schemes. Optional output includes point and area concentration rises and histograms of pollutant concentration by stability class.
Supplementary Notes Files are compressed. Supersedes PB90-500406.
Availability Notes The software is on one 3 1/2 inch DOS diskette, 1.44M high density. File format: ASCII. Documentation included; may be ordered separately as PB86-136546.
NTIS Title Notes Model-Simulation.
Category Codes 68A#; 55B; 91A
NTIS Prices CP D01
Primary Description 600/09
Document Type NT
Control Number 712601540
Cataloging Source NTIS/MT
Origin NTIS
Type CAT