Main Title |
CDM2: Climatological Dispersion Medel, Version 2.0 (on Diskette). |
CORP Author |
Environmental Sciences Research Lab., Research Triangle Park, NC. Meteorology and Assessment Div. |
Publisher |
Sep 97 |
Year Published |
1997 |
Stock Number |
PB98-500051 |
Additional Subjects |
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 ;
CDM2 model ;
Climatological Dispersion Model ;
Emission rate
|
Holdings |
Library |
Call Number |
Additional Info |
Location |
Last Modified |
Checkout Status |
NTIS |
PB98-500051 |
Some EPA libraries have a fiche copy filed under the call number shown. |
|
07/26/2022 |
|
Collation |
1 diskette |
Abstract |
The 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 sources and 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. CDM 2.0 is a preferred model for regulatory applications in simple urban terrain. |
Supplementary Notes |
Supersedes PB90-500273. See also PB97-501480. |
Availability Notes |
The software is on one 3 1/2 inch DOS diskette, 1.44M high density. File format: Executable code only. Order this product from NTIS by: phone at 1-800-553-NTIS (U.S. customers); (703)605-6000 (other countries); fax at (703)321-8547; and email at orders@ntis.fedworld.gov. NTIS is located at 5285 Port Royal Road, Springfield, VA, 22161, USA. |
NTIS Title Notes |
Software. |
Category Codes |
68A#; 55B; 91A |
NTIS Prices |
CP D01 |
Primary Description |
600/09 |
Document Type |
NT |
Cataloging Source |
NTIS/MT |
Control Number |
731602990 |
Origin |
NTIS |
Type |
CAT |