Mathematical model for hermitized atmospheric dispersion in low winds with eddy diffusivities as linear functions of down wind distance |
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Authors: | K S M Essa M S El-Otaify |
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Institution: | (1) Department of Mathematics and Theoretical Physics, Nuclear Research Center, Atomic Energy Authority, Cairo, Egypt |
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Abstract: | Summary In the present paper, an attempt is made for generalized the atmospheric diffusion operator. This can be accomplished by employing
the realizability procedure, to identify a surface operator, that ensures self-adjointness’ of the atmospheric diffusion operator.
The dispersion modeling in low wind speeds assumes importance because of the high frequency of occurrence and episodic nature
of these poor diffusion conditions. A steady-state mathematical model for hermitized model has been calculated for the dispersion
of air pollutants in low winds by taking into account the diffusion in the three coordinate directions and advection along
the mean wind. The eddy diffusivities have been parameterized in terms of downwind distance for near source dispersion (Arya,
1995). The constants involved in this parameterization are the squares of intensities of turbulence. An analytical solution
for resulting advection-diffusion equation with the physically relevant boundary conditions has been obtained. The solution
has been used to simulate the field tracer data collected at IIT Delhi in low wind convective conditions. |
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