Peak to Mean Concentration Ratios According to a

Gifford, F. A.

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Peak to Mean Concentration Ratios According to a "Top-Hat" Fluctuating Plume Model

[PDF-3.73 MB]

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Personal Author:

Gifford, F. A.
Corporate Authors:

Air Resources Atmospheric Turbulence and Diffusion Laboratory.
NOAA Program & Office:

OAR (Oceanic and Atmospheric Research)
Description:

Concentration from tail-stack buoyant plumes is ordinarily calculated using a Gaussian plume distribution that includes an effective stack height. The buoyant plume rise is, however, calculated on a different model, having a uniform distribution through the plume. In an attempt to overcome this ambiguity, a fluctuating, uniform or "top-hat" model of buoyant plumes is introduced. Mean and peak-to-mean concentration formulas are derived and compared with data. Over the range from one to about 10 stack heights downwind, the variation of the peak-to-mean ratio predicted by the model is in general agreement with observed values. P/M varies from 2 to 9 being smaller for shorter distances downwind, more stable conditions and axial, compared with surface level values.
Keywords:

[+]

Air Pollution Atmospheric Diffusion Plumes (Fluid Dynamics) Smoke Plumes
Series:

ATDL contribution file ; 45
Document Type:

Miscellaneous
Rights Information:

Public Domain
Compliance:

Library
Main Document Checksum:

[+]

urn:sha256:b7eb00a06beab09a14485f80216b28bf9006ad86d386e08896022f5f574e23b7
Download URL:

https://repository.library.noaa.gov/view/noaa/33601/noaa_33601_DS1.pdf
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Peak to Mean Concentration Ratios According to a "Top-Hat" Fluctuating Plume Model

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