Large particle diffusion from an elevated line source - a comparative evaluation of a theoretical model with field diffusion experiments

William A. Sprigg

doi:10.1016/0002-1571(73)90035-6

Large particle diffusion from an elevated line source - a comparative evaluation of a theoretical model with field diffusion experiments

William A. Sprigg

Research output: Contribution to journal › Article › peer-review

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Abstract

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 μ 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.

Original language	English (US)
Pages (from-to)	425-439
Number of pages	15
Journal	Agricultural Meteorology
Volume	12
Issue number	C
DOIs	https://doi.org/10.1016/0002-1571(73)90035-6
State	Published - 1973
Externally published	Yes

ASJC Scopus subject areas

General Environmental Science
General Earth and Planetary Sciences

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10.1016/0002-1571(73)90035-6

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title = "Large particle diffusion from an elevated line source - a comparative evaluation of a theoretical model with field diffusion experiments",

abstract = "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 μ 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.",

author = "Sprigg, {William A.}",

note = "Funding Information: A grant covering all computer costs was provided by the Computer Center, Rutgers --the State University of New Jersey.",

year = "1973",

doi = "10.1016/0002-1571(73)90035-6",

language = "English (US)",

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journal = "Agricultural Meteorology",

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T1 - Large particle diffusion from an elevated line source - a comparative evaluation of a theoretical model with field diffusion experiments

AU - Sprigg, William A.

N1 - Funding Information: A grant covering all computer costs was provided by the Computer Center, Rutgers --the State University of New Jersey.

PY - 1973

Y1 - 1973

N2 - 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 μ 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.

AB - 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 μ 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.

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VL - 12

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JO - Agricultural Meteorology

JF - Agricultural Meteorology

IS - C

ER -

Large particle diffusion from an elevated line source - a comparative evaluation of a theoretical model with field diffusion experiments

Abstract

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