Abstract
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 present. The result is checked systematically for diffusivity functions with very different behaviours: power law, exponential and the two Fujita diffusivities. In all cases the error is always less than 1% regardless of whether or not the diffusivity increases rapidly with water content.
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Parlange, J.Y., Barry, D.A., Parlange, M.B. et al. Sorptivity calculation for arbitrary diffusivity. Transp Porous Med 15, 197–208 (1994). https://doi.org/10.1007/BF00613278
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DOI: https://doi.org/10.1007/BF00613278