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Diffusion from a fixed source at a height of a few hundred feet in the atmosphere

Published online by Cambridge University Press:  28 March 2006

J. S. Hay  and
F. Pasquill
J. S. Hay
Affiliation:
Meteorology Section, Chemical Defence Experimental Establishment, Porton, Wiltshire
F. Pasquill
Affiliation:
Meteorology Section, Chemical Defence Experimental Establishment, Porton, Wiltshire
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Abstract

The results of measurements of the vertical distribution of airborne particles, released usually at a height of 500 ft., and sampled for periods of about 30 minutes at downwind distances of 100, 300 and 500 metres, are presented and discussed.

At all distances the frequency distributions of the particle elevation with respect to the site of release are closely similar in shape and size to the frequency distribution of wind inclination at the site of release. This is interpreted as showing that, despite the uncorrelated effects of small eddies, high correlation was maintained in the motion of a particle, for periods of 1 minute or more, by the dominant action of persistent eddies which contributed heavily to the turbulent energy. In contrast to this result, the wind observations showed that the Eulerian auto-correlation coefficient (Rr) fell to about 0.2 in 10 seconds.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 2 , Issue 3 , May 1957 , pp. 299 - 310
Copyright
© 1957 Cambridge University Press

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References

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