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Effects of Constraints on van Genuchten Parameters for Modeling Soil-Water Characteristic Curves

Likos, William J. / Yao, Jun

Abstract

Water-retention data for a suite of predominantly sandy soils were analyzed to quantify the effects of two constraints commonly applied to the three-parameter model for the soil-water characteristic curve (SWCC). Systematic effects were observed. Constraining either the symmetry parameter ( $m$ ) to $m = 1 - 1 / n$ or residual saturation ( $S_{r}$ ) to zero resulted in values for the air-entry parameter $α$ that were approximately 25–30% different than if no constraints were applied. The $m = 1 - 1 / n$ constraint forced the pore-size distribution parameter $n$ to fall within a narrow range ( $\sim 1.5 < n < \sim 4.0$ ), whereas $n$ values using independent $m$ and $n$ were more variable and could be as large as 35. The $m = 1 - 1 / n$ constraint produced best-fit residual saturation values that were approximately 0.02 higher than without the constraint. These differences are significant and should be considered when adopting existing or new pedotransfer functions for estimating water-retention behavior of unsaturated soils from more easily measured properties.

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Effects of Constraints on van Genuchten Parameters for Modeling Soil-Water Characteristic Curves

Likos, William J. / Yao, Jun

Abstract

Water-retention data for a suite of predominantly sandy soils were analyzed to quantify the effects of two constraints commonly applied to the three-parameter model for the soil-water characteristic curve (SWCC). Systematic effects were observed. Constraining either the symmetry parameter ( $m$ ) to $m = 1 - 1 / n$ or residual saturation ( $S_{r}$ ) to zero resulted in values for the air-entry parameter $α$ that were approximately 25–30% different than if no constraints were applied. The $m = 1 - 1 / n$ constraint forced the pore-size distribution parameter $n$ to fall within a narrow range ( $\sim 1.5 < n < \sim 4.0$ ), whereas $n$ values using independent $m$ and $n$ were more variable and could be as large as 35. The $m = 1 - 1 / n$ constraint produced best-fit residual saturation values that were approximately 0.02 higher than without the constraint. These differences are significant and should be considered when adopting existing or new pedotransfer functions for estimating water-retention behavior of unsaturated soils from more easily measured properties.

Effects of Constraints on van Genuchten Parameters for Modeling Soil-Water Characteristic Curves

Likos, William J. / Yao, Jun

Abstract

Water-retention data for a suite of predominantly sandy soils were analyzed to quantify the effects of two constraints commonly applied to the three-parameter model for the soil-water characteristic curve (SWCC). Systematic effects were observed. Constraining either the symmetry parameter ( $m$ ) to $m = 1 - 1 / n$ or residual saturation ( $S_{r}$ ) to zero resulted in values for the air-entry parameter $α$ that were approximately 25–30% different than if no constraints were applied. The $m = 1 - 1 / n$ constraint forced the pore-size distribution parameter $n$ to fall within a narrow range ( $\sim 1.5 < n < \sim 4.0$ ), whereas $n$ values using independent $m$ and $n$ were more variable and could be as large as 35. The $m = 1 - 1 / n$ constraint produced best-fit residual saturation values that were approximately 0.02 higher than without the constraint. These differences are significant and should be considered when adopting existing or new pedotransfer functions for estimating water-retention behavior of unsaturated soils from more easily measured properties.

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Titel:

Effects of Constraints on van Genuchten Parameters for Modeling Soil-Water Characteristic Curves

Beteiligte:

Likos, William J. (Autor:in) / Yao, Jun (Autor:in)

Erschienen in:

Journal of Geotechnical and Geoenvironmental Engineering ; 140

Erscheinungsdatum:

30.07.2014

ISSN:

1090-0241 , 1943-5606

DOI:

https://doi.org/10.1061/(ASCE)GT.1943-5606.0001168

Medientyp:

Aufsatz (Zeitschrift)

Format:

Elektronische Ressource

Sprache:

Unbekannt

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