Diffusion and Ground Deposition of 100 Micron Particles from a Point at a Height of 92 Metres.
DEFENCE RESEARCH ESTABLISHMENT SUFFIELD RALSTON (ALBERTA)
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The results of a series of field trials on the diffusion and ground deposition of 100 micron glass microspheres from a continuous point source at a height of 92 metres 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 the sloping plume model. However, the K-Theory model predicts a peak deposit much lower than observed and a more gradual decrease in the deposit density than observed.
- Atmospheric Physics