You are here:
COMMENTS ON LATERAL DISPERSION FORM TALL STACKS
Citation:
Briggs, G. COMMENTS ON LATERAL DISPERSION FORM TALL STACKS. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/J-87/480 (NTIS PB89201867), 1989.
Description:
A few minor errors in Hanna (1986) are noted and several questions are raised about apparent inconsistencies in this paper. ne question concerns why substantial enhancement of oy by buoyancy was noted for the Bull Run data but was unmentioned for the Kincaid data; information given in the paper suggests similar ranges of X*/F* at both plants, but much smaller F* values at Kincaid, which may account for the lack of noticeable buoyancy effects there. he inconsistency between the recommended equation oy/x = 0.6 w*/u and the oy/x values recommended for various stability classes (based on u/w* ranges) can be removed by multiplying this oy expression by a factor which accounts for the effect of mechanical turbulence. inally, it is noted that an identical equation was recently reported to give a good fit to oy from passive sources released above 0.3h, albeit to much smaller distances than reported by Hanna.