Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 309039
Title Modeling gravity driven unstable flow in a water repellent soil
Author(s) Nguyen, H.V.; Nieber, J.L.; Ritsema, C.J.; Dekker, L.W.; Steenhuis, T.S.
Source Minneapolis (US) : Univ. Minnesota (AHPCRC Preprint 98-036)
Department(s) Winand Staring Centre for Integrated Land, Soil and Water Research
Publication type Research report
Publication year 1998
Abstract One mechanism for the initiation of unstable flow in porous media is a condition of hydrophobicity of the solid phase. Recent continuous and nondestructive measurements of water content distribution in a 200 cm wide by 70 cm deep trench of a Netherlands' field soil containing a hydrophobic layer, reveals a complicated wetting pattern with fingered flow being quite prevalent. The soil profile consists of a humic top layer; a second layer consisting of hydrophobic sand, and a hydrophilic sandy layer at the bottom of the soil profile. In this paper we show our attempts to simulate the unstable flow pattern observed in the field using a numerical solution developed for modeling gravity-driven unstable flow. The unstable flow simulation method employs a globally mass conservative finite element solution of the Richards equation applied to the soil trench. The overall patterns of simulated saturation are similar to those of observed saturation. Statistical analysis shows that pointwise predicted saturation is reasonably close to the observed.
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