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Equations for the soil-water characteristic curve
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1994
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Geotechnical EngineeringHydrogeologyNonlinear Curve FittingSoil PropertyEngineeringSoil SuctionSoil ModelingEnvironmental EngineeringCivil EngineeringSoil-water Characteristic CurveHydrologyEarth ScienceHydraulic Property
The soil‑water characteristic curve can be used to estimate various parameters used to describe unsaturated soil behaviour. A general equation for the soil‑water characteristic curve is proposed. The authors develop a nonlinear least‑squares fitting procedure that models the curve as an integrated frequency distribution linked to the soil’s pore‑size distribution. The equation provides a good fit for sand, silt, and clay soils over the entire suction range from 0 to 10⁶ kPa. Keywords: soil‑water characteristic curve, pore‑size distribution, nonlinear curve fitting, soil suction, water content.
The soil-water characteristic curve can be used to estimate various parameters used to describe unsaturated soil behaviour. A general equation for the soil-water characteristic curve is proposed. A nonlinear, least-squares computer program is used to determine the best-fit parameters for experimental data presented in the literature. The equation is based on the assumption that the shape of the soil-water characteristic curve is dependent upon the pore-size distribution of the soil (i.e., the desaturation is a function of the pore-size distribution). The equation has the form of an integrated frequency distribution curve. The equation provides a good fit for sand, silt, and clay soils over the entire suction range from 0 to 10 6 kPa. Key words : soil-water characteristic curve, pore-size distribution, nonlinear curve fitting, soil suction, water content.