On the Improvement of Hydraulic Conductivity Function in Van Genuchten-Mualem Model

Yeong Mog Park; Seboong Oh; Inchul Jin; Kyun Kwon Oh

doi:10.4028/www.scientific.net/AMM.513-517.4417

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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vols. 513-517On the Improvement of Hydraulic Conductivity...

On the Improvement of Hydraulic Conductivity Function in Van Genuchten-Mualem Model

Abstract:

Hydraulic conductivity (HC) is deduced indirectly from soil water retention curves (SWRC) by Mualem model, but the mathematical calculation in the Mualem model is sensitive to integration interval near saturation. After the van Genuchten model fit actual SWRC, the van Genuchten-Mualem (VGM) HC is integrated simply by an analytical function for unsaturated soils. However the analytical solution on VGM HC results in the rapid change of HC near saturation. For unsaturated soils sampled in Korea, SWRCs and unsaturated HCs were obtained by experiments. The HC experiments were compared with the HC models from the SWRCs. As a result, VGM models of HC function underestimate the unsaturated HC and show rapid reduction near saturation. It is found that a modification in VGM model should be required to predict accurate HC functions.

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Periodical:

Applied Mechanics and Materials (Volumes 513-517)

Pages:

4417-4420

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.513-517.4417

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Online since:

February 2014

Authors:

Yeong Mog Park, Seboong Oh*, Inchul Jin, Kyun Kwon Oh

Keywords:

Hydraulic Conductivity, Numerical Stability, Soil Water Retention Characteristics, Unsaturated Soil

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References

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