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Estimation of the soil water retention curve using penetration resistance curve models
Computers and Electronics in Agriculture, 2018Abstract In this study, pedotransfer functions (PTFs) were developed for estimating the gravimetric water content based on the model of Dexter et al. (2008) using feed-forward artificial neural networks. Soil samples were collected from 148 locations in the West Azarbaijan, Hamedan, Fars, and Kurdistan provinces of Iran. The cation exchange capacity (
Hossein Bayat, Golnaz Ebrahim Zadeh
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Temperature Dependence of Soil Water Retention Curves
Soil Science Society of America Journal, 1986Abstract Effects of entrapped air volume and surface tension of soil solution are often regarded as the primary cause of temperature effects on the water retention curve. A procedure was developed to determine simultaneously the water characteristic curves and the volume of entrapped air for a glass beads medium and a Norfolk sandy ...
J. W. Hopmans, J. H. Dane
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Determination of the Soil Water Retention Curve with Tensiometers
2007An alternative technique for the determination of the soil water retention curve has recently been proposed whereby a tensiometer is used to measure soil suction and a balance to record the water content variations. The soil water retention curve is obtained by drying the soil either continuously or by stages (i.e.
Gallipoli, D +4 more
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A conceptual model of the soil water retention curve
Water Resources Research, 1998A conceptual model based on the assumption that soil structure evolves from a uniform random fragmentation process is proposed to define the water retention function. The fragmentation process determines the particle size distribution of the soil. The transformation of particles volumes into pore volumes via a power function and the adoption of the ...
Assouline, S., Tessier, D., Bruand, Ary
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A Technique for Producing Soil Water Retention Curves
South African Forestry Journal, 1990SYNOPSIS Water retention curves compiled for specific soil types are an essential management and research tool in evaluating plant stress. The method of producing water retention curves by means of the 1500 kPa pressure extractor is described.
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Equation for Extending Water‐Retention Curves to Dryness
Soil Science Society of America Journal, 1991Abstract Simple water‐retention functions in current use do not predict zero water content at oven dryness. Using the Campbell equation θ = a ψ ‐c = θ s
P. J. Ross, J. Williams, K. L. Bristow
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Influence of water density on the water-retention curve of expansive clays
Géotechnique, 2012There is increasing evidence from researchers on clay mineralogy that the density of water attached to clay minerals may be greater than 1·0 Mg/m3. This fact becomes especially evident in compacted highly expansive clays close to water saturation. This kind of material is being considered in the design of engineered barriers for radioactive waste ...
A.C. JACINTO, M.V. VILLAR, A. LEDESMA
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An Improved Volume Measurement for Determining Soil Water Retention Curves
Geotechnical Testing Journal, 2007Abstract The complete determination of soil water retention curves requires the sample volume to be measured in order to calculate its void ratio and degree of saturation. During drying in the pressure plate apparatus, cracks often appear in the sample altering its deformation and evaporation patterns.
Péron, H., Hueckel, T., Laloui, L.
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On the fractal behaviour of water retention curves
2011Water retention curve (WRC) is analyzed by means of the fractal geometry approach. Three models accounting for the fractal distribution of either the pore and solid phase of unsaturated porous media have been considered. By using data collected during a field scale internal drainage, we determine the functional relationship between the WRC, and the ...
M. Veltri +4 more
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