Js. Lin et Lm. Hildemann, MODELING VERTICAL SPREAD OF AIRBORNE POLLUTANTS FROM SOURCES NEAR GROUND-LEVEL - COMPARISON WITH FIELD-MEASUREMENTS, Journal of environmental engineering, 123(12), 1997, pp. 1194-1202
An extensive set of field data from Project Prairie Grass has been use
d to evaluate various methods of estimating the input parameters commo
nly used by analytical plume models for characterizing the vertical pr
ofiles for wind speed and eddy diffusivity. Estimation of the vertical
eddy transfer coefficient using the Businger heat transfer parameters
from similarity theory showed the closest agreement with experimental
data measured in the near vicinity of the source (<1,000 m downwind).
Using the optimal input parameter estimation techniques identified, t
he downwind and vertical concentration profiles predicted by four anal
ytical models were quantitatively compared with the field data under a
range of meteorological conditions. Near ground level in the downwind
direction, under stable atmospheric conditions all four models genera
ted similar predictions that agreed fairly well with the data. Under u
nstable conditions, significant differences in the predictions of the
four models were seen, especially at greater distances downward.