Estimating plume dispersion: a comparison of several sigma schemes
Journal Article
·
· J. Appl. Meteorol.; (United States)
The lateral and vertical Gaussian plume dispersion parameters are estimated and compared with field tracer data collected at 11 sites. The dispersion parameter schemes used in this analysis include Cramer's scheme, suggested for tall stack dispersion estimates, Draxler's scheme, suggested for elevated and surface releases, Pasquill's scheme, suggested for interim use in dispersion estimates, and the Pasquill--Gifford scheme using Turner's technique for assigning stability categories. The schemes suggested by Cramer, Draxler and Pasquill estimate the dispersion parameters using onsite measurements of the vertical and lateral wind-velocity variances at the effective release height. The performances of these schemes in estimating the dispersion parameters are compared with that of the Pasquill--Gifford scheme, using the Prairie Grass and Karlsruhe data. For these two experiments, the estimates of the dispersion parameters using Draxler's scheme correlate better with the measurements than did estimates using the Pasquill--Gifford scheme. Comparison of the dispersion parameter estimates with the measurement suggests that Draxler's scheme for characterizing the dispersion results in the smallest mean fractional error in the estimated dispersion parameters and the smallest variance of the fractional errors.
- Research Organization:
- Environmental Sciences Research Laboratory, EPA, Research Triangle Park, NC 27711
- OSTI ID:
- 6220366
- Journal Information:
- J. Appl. Meteorol.; (United States), Journal Name: J. Appl. Meteorol.; (United States) Vol. 22:1; ISSN JAMOA
- Country of Publication:
- United States
- Language:
- English
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