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Hybrid Methods in Engineering

Published 4 issues per year

ISSN Print: 1099-2391

ISSN Online: 2641-7359

DISPERSION PARAMETERIZATION APPLIED TO STRONG CONVECTION: LOW SOURCES CASE

Volume 4, Issue 1&2, 2002, 20 pages
DOI: 10.1615/HybMethEng.v4.i1-2.50
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ABSTRACT

Accounting for the current knowledge of the convective boundary layer (CBL) structure and characteristics, a simple semi-empirical formulation for the eddy diffusivity and dispersion parameter to be used in atmospheric dispersion models has been derived. That is, an expression for the dispersion parameter and eddy diffusivity depending on source distance for inhomogeneous turbulence in strongly unstable conditions is proposed. Yaglom's similarity theory is used to estimate these quantities. In addition, this vertical eddy diffusivity expression was introduced into an air pollution model, validated using data from the Prairie Grass experiments, and then compared with a Gaussian model. The results of this parameterization are shown to agree with the measurements of Prairie Grass and also with those of the Gaussian model. Furthermore, the present study suggests that the inclusion of the memory effect in Yaglom's similarity theory, which is important in near regions from a low continuous point source under strongly unstable conditions, improves the description of the turbulent transport process of atmospheric contaminants.

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