A closed-form equation for predicting the hydraulic conductivity of unsaturated soils

@article{Genuchten1980ACE,
  title={A closed-form equation for predicting the hydraulic conductivity of unsaturated soils},
  author={Van Genuchten and M. Th.},
  journal={Soil Science Society of America Journal},
  year={1980},
  volume={44},
  pages={892-898}
}
  • Van GenuchtenM. Th.
  • Published 1 September 1980
  • Environmental Science
  • Soil Science Society of America Journal
A new and relatively simple equation for the soil-water content-pressure head curve, 8(h), is described in this paper. The particular form of the equation enables one to derive closedform analytical expressions for the relative hydraulic conductivity, Kr, when substituted in the predictive conductivity models of N.T. Burdine or Y. Mualem. The resulting expressions for Kr(h) contain three independent parameters which may be obtained by fitting the proposed soil-water retention model to… 

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References

SHOWING 1-10 OF 11 REFERENCES

A new model for predicting the hydraulic conductivity of unsaturated porous media

A simple analytic model is proposed which predicts the unsaturated hydraulic conductivity curves by using the moisture content-capillary head curve and the measured value of the hydraulic

Comparison of measured and calculated hydraulic conductivities of unsaturated soils

Three methods to calculate the unsaturated conductivity of soil from its moisture characteristic were tested. Calculated values were compared with direct measurements of conductivity for both

Properties of Porous Media Affecting Fluid Flow

Following the Burdine approach, based on a model developed by Wyllie and Spangler, a theory is presented that develops the functional relationships among saturation, pressure difference, and

Permeability of porous solids

An expression has been derived to describe both saturated and unsaturated permeability of porous media in terms of the pore size distribution as obtained from mercury-injection data or

Note on the three-parameter functions for soil water diffusivity - Water content relationships

Two three-parameter functions to describe soil water diffusivity (D)-moisture content (e) relationships were statistically tested with experimental data of 20 soils of India. The results showed that