DIFFUSION AND DEPOSITION OF 30 MICRON PARTICLES FROM A LOW LEVEL SOURCE

Authors
  1. McCallum, J.A.
  2. Johnson, O.
  3. Larson, B.R.
Corporate Authors
Defence Research Establishment Suffield, Ralston ALTA (CAN)
Abstract
The results of a series of field trials on the diffusion and ground deposition of 30 micron glass microspheres from a continuous point source at a height of 2.75 meters are discussed. The observed crosswind integrated deposit density as a function of distance from the source was used to test two prediction models. One of these models employs appropriately averaged standard deviations of vertical turbulence as the main parameter of atmospheric diffusion. The other is the steady state K-theory diffusion model with a coefficient of eddy diffusivity which varies with height. In general, there was reasonably good agreement between the observed and predicted crosswind integrated deposit density as a function of distance for both models, although the sloping plume model tends to predict greater rates of deposition than observed, while the K-theory model predicts lower rates of deposition than observed. Several trials using 30 micron glass microspheres released from 2.75m.
Report Number
TP-367 —
Date of publication
15 Mar 1974
Number of Pages
44
DSTKIM No
74-03065
CANDIS No
22751
Format(s):
Hardcopy;Originator's fiche received by DSIS

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