It is not the intent of this discussion of the accuracy of Gaussian dispersion models to denigrate the importance and the usefulness of such models. In actual fact, those models are the best tools we have. But we must keep in mind that they are only tools and they do not provide the ultimate truth. The models can be very useful in qualitatively predicting which industrial plant designs and which plant sites should result in a lower impact on air quality. They can also be very useful in evaluating and selecting emission control methods. But they are far from being able to consistently predict actual dispersing plume concentrations by a factor within two or three. The consistent prediction of actual plume concentrations within a factor as high as ten is probably a more realistic assessment of the accuracy of Gaussian dispersion models used to calculate and predict short-term average concentrations. Once again, as stated at the beginning of this section, we must not confuse precision with accuracy.
Last edited by Milton Beychok
May 25, 2013 | History
Fundamentals of Stack Gas Dispersion 3 editions
Fundamentals of Stack Gas Dispersion
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About the Book
This is the most comprehensive book on dispersion modeling of continuous, buoyant air pollution plumes which takes nothing for granted. Every equation is completely derived step-by-step without any complicated or advanced mathematics. Every constraint and assumption is fully explained. The Fourth Edition was published in 2005 and is the latest edition.
The subjects covered in the book include atmospheric turbulence and stability classes, buoyant plume rise, Gaussian dispersion calculations and modeling, time-averaged concentrations, wind velocity profiles, fumigations, trapped plumes, flare stack plumes and much more ... with a great many example calculations.
The book has been purchased in 78 countries and referenced over 600 times in the technical literature and on the Internet. It is also referenced in the regulatory publications of 25 state or national governmental agencies worldwide. It has been or is now being used as a textbook or as recommended reading in courses at 46 universities worldwide. It is currently available in 216 libraries worldwide.
More information is available at www.air-dispersion.com website.
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Excerpts
Page 117,
added by Milton Beychok.
"Because it is important to emphasize that the models for predicting the dispersion of air pollution plumes are merely tools and they do not provide results that are accurate to the nth degree. In fact, their predictions may be as much as 10 times higher or 10 times lower than the actual dispersion results."
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| Dewey | 628.5/32 |
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3 editions First published in 1979
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2005, Milton R. Beychok
Fundamentals of Stack Gas Dispersion
PDF format available online
in English
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4th edition
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History Created December 9, 2009 · 28 revisions
| May 25, 2013 | Edited by Milton Beychok | Updated |
| May 17, 2013 | Edited by Milton Beychok | Updated |
| May 13, 2013 | Edited by Milton Beychok | Updated |
| May 4, 2013 | Edited by Milton Beychok | Updated |
| December 9, 2009 | Created by WorkBot | add works page |