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- W2024614787 abstract "Solute dispersivity defined from the classical advective–dispersive equation (ADE) was found to increase as the length of a soil column or the soil depth increased. The heterogeneity of soil is a physical reason for this scale dependence. Such transport can be described assuming that the random movement of solute particles belongs to the family of so-called Lévy motions. Recently a differential solute transport equation was derived for Lévy motions using fractional derivatives to describe advective dispersion. Our objective was to test applicability of the fractional ADE, or FADE, to solute transport in soils and to compare results of FADE and ADE applications. The one-dimensional FADE with symmetrical dispersion included two parameters: the fractional dispersion coefficient and the order of fractional differentiation α , 0 < α ≤ 2. The FADE reduces to the ADE when the parameter Analytical solutions of the FADE and the ADE were fitted to the data from experiments on Cl− transport in sand, in structured clay soil, and in columns made of soil aggregates. The FADE simulated scale effects and tails on the breakthrough curves (BTCs) better than, or as well as, the ADE. The fractional dispersion coefficient did not depend on the distance. In the clay soil column, the parameter α did not change significantly when the flow rate changed provided the degree of saturation changed only slightly. With the FADE, the scale effects are reflected by the order of the fractional derivative, and the fractional dispersion coefficient needs to be found at only one scale." @default.
- W2024614787 created "2016-06-24" @default.
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- W2024614787 date "2000-07-01" @default.
- W2024614787 modified "2023-10-04" @default.
- W2024614787 title "Simulating Scale-Dependent Solute Transport in Soils with the Fractional Advective-Dispersive Equation" @default.
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- W2024614787 doi "https://doi.org/10.2136/sssaj2000.6441234x" @default.
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