OLS : Record


Main Title Video Image Analyses of the Cross-Stream Distribution of Smoke in the Near Wake of a Building.
Author Huber, A. H.; Arya, S. P. S.;
CORP Author Environmental Protection Agency, Research Triangle Park, NC. Atmospheric Sciences Research Lab. ;North Carolina State Univ. at Raleigh. Dept. of Marine, Earth and Atmospheric Sciences.
Year Published 1988
Report Number EPA/600/D-88/066;
Stock Number PB88-196167
Subjects Smoke; Dispersion; Tests; Wind tunnels; Wakes; Buildings; Images; Computer programs; Image intensifiers; Analyzing; Variation; Measurement; Digital techniques; Air pollution; Image analysis; Image enhancement; Video data; Wind tunnel tests
Library   Call Number Additional Info Location Date Modified
NTIS PB88-196167 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 09/04/1988
Collation 8p
Abstract In a wind-tunnel study, recorded video images of the top view of smoke dispersion in the wake of a building were analyzed. A continuous source of smoke was emitted at floor level, midway along the leeward side of the building. The technique and usefulness of analyzing video images of smoke is demonstrated in a study of building effects on smoke dispersion. The presentation discusses how the video image intensity is corrected for background intensity and then normalized to a scale of 0 to 100 percent. Profiles of the normalized image mean intensity are compared with similar profiles for the mean concentration of hydrocarbon tracer. The distributions of intensity of cross-stream profiles are discussed. These distributions were analyzed in time and space. Also, time-averaged cross-stream profiles of mean, standard deviation, and other statistics of image intensity are compared with traditional concentration measurements for symmetric wake flow.
Supplementary Notes Prepared in cooperation with North Carolina State Univ. at Raleigh. Dept. of Marine, Earth and Atmospheric Sciences.
PUB Date Free Form Apr 88
Category Codes 68A; 68; 51F
NTIS Prices PC A02/MF A01
Primary Description 600/09
Document Type NT
Control Number 819620478
Cataloging Source NTIS/MT
Origin NTIS
Type CAT