### 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) |
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Pages (from-to) | 425-439 |

Number of pages | 15 |

Journal | Agricultural Meteorology |

Volume | 12 |

Issue number | C |

DOIs | |

State | Published - 1973 |

Externally published | Yes |

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**Large particle diffusion from an elevated line source - a comparative evaluation of a theoretical model with field diffusion experiments.** / Sprigg, William A.

Research output: Contribution to journal › Article

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TY - JOUR

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

AU - Sprigg, William A

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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U2 - 10.1016/0002-1571(73)90035-6

DO - 10.1016/0002-1571(73)90035-6

M3 - Article

VL - 12

SP - 425

EP - 439

JO - Agricultural and Forest Meteorology

JF - Agricultural and Forest Meteorology

SN - 0168-1923

IS - C

ER -