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Erschienen in:
2013 | OriginalPaper | Buchkapitel
A Stochastic Model for Hydrodynamic Dispersion
verfasst von : Don Kulasiri
Erschienen in: Non-fickian Solute Transport in Porous Media
Verlag: Springer Berlin Heidelberg
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We have seen in Chap. 1 that, in the derivation of advection–dispersion equation, also known as continuum transport model (Rashidi et al. 1999), the velocity fluctuations around the mean velocity enter into the calculation of solute flux at a given point through averaging theorems. The mean advective flux and the mean dispersive flux are then related to the concentration gradients through Fickian–type assumptions. These assumptions are instrumental in defining dispersivity as a measure of solute dispersion. Dispersivity is proven to be scale dependant.