Record Display for the EPA National Library Catalog


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
Additional 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 Last
NTIS  PB88-196167 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 8p
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.