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ESTIMATING PLUME DISPERSION: A COMPARISON OF SEVERAL SIGMA SCHEMES
Citation:
Irwin, J. ESTIMATING PLUME DISPERSION: A COMPARISON OF SEVERAL SIGMA SCHEMES. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/J-82/107 (NTIS PB84142306).
Description:
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 techniques 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.