Large particle diffusion from an elevated line source - a comparative evaluation of a theoretical model with field diffusion experiments
✍ Scribed by William A. Sprigg
- Publisher
- Elsevier Science
- Year
- 1973
- Weight
- 668 KB
- Volume
- 12
- Category
- Article
- ISSN
- 0002-1571
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✦ Synopsis
Sprigg, W. A., 1973.
Large particle diffusion from an elevated line source --a comparative evaluation of a theoretical model with field diffusion experiments. Agric. Meteorol., 12: 425--439.
A theoretical model of atmospheric diffusion of a polydispersed material from an elevated line source is used to predict downwind deposition of large particles (nominally 100 p diameter) released during six separate field diffusion experiments. Two equations are used. One, where diffusion is dependent on the distribution of particles as advected in a steady-state condition. The second includes factors to account for atmospheric turbulence and diffusion. When the correct equation is chosen for a given turbulence condition, in all but two of the diffusion trials the model is within 5 m of predicting the point of maximum deposition; in all six trials the greatest discrepancy is 15 m. The model is reasonably capable of predicting values of downwind deposition. Wind profile fitting terms are shown to be most accurate under thermally stable atmospheric conditions.