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T. Mikkelsen
and
I. Troen

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I. Troen
,
T. Mikkelsen
, and
S. E. Larsen

Abstract

No abstract available.

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I. Troen
,
T. Mikkelsen
, and
S. E. Larsen

Abstract

The diffusion equation with a wavenumber-dependent diffusivity is derived as an approximation to the statistical theory of plume dispersion from a continuous point source. The travel time explicitly appearing in the statistical theory is implicitly included in the wavenumber-dependent diffusivity K(k). By suitable choice of this function it is possible within a few percent to reproduce the centerline concentration. Due to the approximate nature of the method, however, it yields a non-Gaussian concentration shape close to the source.

Results for the case of a crosswind extended source are compared to other commonly used methods for this problem. Some considerations are presented on the proper choice of averaging time for the concentration field.

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