# Improved Prediction of Unsaturated Hydraulic Conductivity with the Mualem‐van Genuchten Model

@article{Schaap2000ImprovedPO, title={Improved Prediction of Unsaturated Hydraulic Conductivity with the Mualem‐van Genuchten Model}, author={Marcel G. Schaap and Feike J. Leij}, journal={Soil Science Society of America Journal}, year={2000}, volume={64}, pages={843-851} }

In many vadose zone hydrological studies, it is imperative that the soil's unsaturated hydraulic conductivity is known. Frequently, the Mualem-van Genuchten model (MVG) is used for this purpose because it allows prediction of unsaturated hydraulic conductivity from water retention parameters. For this and similar equations, it is often assumed that a measured saturated hydraulic conductivity (K s ) can be used as a matching point (K o ) while a factor S L e is used to account for pore…

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## References

SHOWING 1-10 OF 43 REFERENCES

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

- Geology
- 1976

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…

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

- Environmental Science
- 1980

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…

### General model for unsaturated hydraulic conductivity for soils with lognormal pore-size distribution.

- Materials Science
- 1999

Describing water flow in unsaturated soils requires knowledge of the unsaturated hydraulic conductivity. This study was conducted to develop a general conductivity model for soils with lognormal…

### Analysis of Measured, Predicted, and Estimated Hydraulic Conductivity Using the RETC Computer Program

- Mathematics
- 1992

A nonlinear least-squares optimization program, RETC, which uses empirical relationships for describing the water-retention curve and predictive models for characterizing the unsaturated hydraulic…

### Estimating the unsaturated hydraulic conductivity from theoretical models using simple soil properties

- Chemistry
- 1995

### Hydraulic conductivity estimation for soils with heterogeneous pore structure

- Geology
- 1994

The hydraulic conductivity function, which is required to solve the Richards equation, is difficult to measure. Therefore prediction methods are frequently used where the shape of the conductivity…

### Comparison of six methods to determine unsaturated soil hydraulic conductivity.

- Environmental Science
- 1994

Knowledge of soil hydraulic properties is required for soil-water flow models. Although many studies of individual methods exist, comparisons of methods are uncommon. Therefore, we compared…

### On the reliability of unsaturated hydraulic conductivity calculated from the moisture retention curve

- Materials Science
- 1988

In comparison with direct measurements of unsaturated hydraulic conductivity, the methods of calculations from the moisture retention curve are attractive for their fast and simple use and low cost.…

### ESTIMATING UNSATURATED HYDRAULIC CONDUCTIVITY FROM EASILY MEASURED SOIL PROPERTIES

- Materials Science
- 1990

We measured hydraulic conductivity (saturated and unsaturated) on 127 soil cores, which were taken in different horizons of a wide variety of Belgian soil series. The hot air method (Arya et al.…

### Neural network analysis for hierarchical prediction of soil hydraulic properties

- Mathematics
- 1998

The solution of many field-scale flow and transport problems requires estimates of unsaturated soil hydraulic properties. The objective of this study was to calibrate neural network models for…