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Estimating the sorptivity for a wide range of diffusivity dependence on water content






Transport in Porous Media 10(1): 95-101

Estimating the sorptivity for a wide range of diffusivity dependence on water content

Investigations have indicated that the diffusivity of undisturbed field soils varies much less rapidly than that of repacked soils commonly used in laboratory studies. In fact, for certain soils, the diffusivity may decrease with increasing moisture content.

Accession: 002373035

DOI: 10.1007/bf00617513

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Related references

Barry D.A.; Parlange J.Y., 1994: Comment on Estimating the sorptivity for a wide range of diffusivity dependence on water content by D. Lockington. Transport in Porous Media: , Pages 89-92. 1994.

Braddock R.D.; Parlange J.Y.; Lisle I.G., 1981: Properties of the sorptivity for exponential diffusivity and application to the measurement of the soil water diffusivity. For certain diffusivities, 1st integral techniques are used to decouple the soil-water diffusion equation, in similarity form, into a set of 1st-order equations. Such a decoupling is possible where the diffusivity depends on the water concentratio...

Smiles, D.E., 1977: Further comments on estimating the moisture diffusivity of saturated swelling materials using sorptivity data. Application of the theory of water movement in saturated clay has recently been criticised. It is shown that this criticism is unfounded.

Clothier B.E.; White I., 1981: Measurement of sorptivity and soil water diffusivity in the field. An analysis for scaling the exponential soil water diffusivity function, D(.theta.), from concurrent measurements of sorptivity and wet front advance is presented. This analysis provides a field method for measuring .beta., the slope of the expone...

Dirksen, C., 1975: Determination of soil water diffusivity by sorptivity measurements. A series of simple and fast one-dimensional sorptivity measurements for various pressure heads at the source are used to determine the dependence of soil water diffusivity and conductivity on water content or pressure head. Results are tested theo...

Parlange J Y.; Braddock R.D.; Lisle I., 1980: Third order integral relation between sorptivity and soil water diffusivity using brutsaerts technique. Integral relationships between sorptivity and weighted mean diffusivity have been usually justified by numerical tests. Optimization provides a justification on more fundamental ground, when diffusivity increases rapidly with water content. The pr...

T.A.Arkhangel’skaya, 2009: Parameterization and mathematical modeling of the dependence of soil thermal diffusivity on the water content. Eurasian Soil Science 42(2): 162-172

Gerke, H.; Kohne, J., 2002: Estimating hydraulic properties of soil aggregate skins from sorptivity and water retention. Skins of soil aggregates often consist of clayey or clay-organic coatings which may affect preferential flow in aggregated soils. The objective was to determine hydraulic properties of samples with intact and removed (cut) skins and interior/skin...

Parlange, J.Y.; Barry, D.A.; Parlange, M.B.; Lockington, D.A.; Haverkamp, R., 1994: Sorptivity calculation for arbitrary diffusivity. An estimate of the sorptivity that requires only the knowledge of simple integrals of the soil-water diffusivity weighted by a power of the water content is presented. The result is checked systematically for diffusivity functions with very differ...

Wang, S.; Copeland, L., 2012: Phase transitions of pea starch over a wide range of water content. The phase transitions of pea starch over a wide range of water content were investigated by differential scanning calorimetry (DSC). Swelling of starch granules increased progressively with increasing water content. The main endotherm G broadened...