Record Display for the EPA National Library Catalog


Main Title Lidar Study of Stack Plumes.
Author Johnson, Jr, Warren B. ; Uth, Edward E. ;
CORP Author Stanford Research Inst., Menlo Park, Calif.
Year Published 1969
Report Number PH-22-68-33; SRI-7289;
Stock Number PB-185 893
Additional Subjects ( Air pollution ; Smokes) ; ( Smokes ; Optical scanning) ; Opdar ; Lasers ; Analysis ; Distribution ; Stack plumes ; Plume detection ; Profiles
Library Call Number Additional Info Location Last
NTIS  PB-185 893 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 113p
The feasibility of lidar (laser radar) for stack plume studies is established from the results of an experimental investigation of plume behavior from a 245-m power plant stack in western Pennsylvania. During this study a total of 175 vertical plume cross sections containing about 3800 separate lidar observations were obtained, of which 64 cross sections representative of various types of plume behavior were selected for detailed analysis. Each vertical cross section was built up from 15 to 30 lidar shots at 5 to 8 second intervals and at elevation angle increments of 1/3 degrees to 10 degrees. The selected cross sections are grouped into series which show the spatial (downwind) and temporal variations in plume geometry and relative particulate concentration distributions. The factors involved in interpreting the lidar data in terms of plume rise and diffusion are discussed and exemplified. Although calculated plume-rise values agree reasonably well with the observations, it is clear from inspection of the cross sections that the important effects of vertical wind direction shear (plume tilting and fanning) and vertical changes in stability (plume trapping) should be taken into account when predicting plume rise and diffusion. Close correspondence between plume tops and levels of increased atmospheric stability was found. Several cross sections are shown of fumigating plumes, which occurred frequently. In a tilted plume, different portions apparently fumigate at different times. Optimum use of lidar for diffusion studies requires provision for obtaining 30-minute or hourly plume concentration distributions, as well as allowances for the effect of the lidar noise level upon plume size. (Author)