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…
410 Citations
Utilizing Splintex 2.0 for estimating the soil hydraulic conductivity curve measured with instantaneous profile method
- Mathematics
- 2020
A modification to the van Genuchten model for improved prediction of relative hydraulic conductivity of unsaturated soils
- Environmental ScienceEuropean Journal of Soil Science
- 2020
Modelling of flow and transport in unsaturated soils requires information on two fundamental hydraulic properties: the soil water retention curve and relative hydraulic conductivity. A soil's…
Modeling hydraulic properties of sandy soils of Niger using pedotransfer functions
- Environmental Science
- 2007
Evaluation and application of the modified van Genuchten function for unsaturated porous media
- MathematicsJournal of Hydrology
- 2019
PREDICTION OF UNSATURATED HYDRAULIC CONDUCTIVITY FOR THREE MAJOR EGYPTIAN SOILS
- Journal of Soil Sciences and Agricultural Engineering
- 2002
The unsaturated soil hydraulic conductivity K(θ) is quite important and required for many hydrological processes and soil-water flux modeling, and agricultural applications, including land-use…
Pedotransfer Function for the Brunswick Soil Hydraulic Property Model and Comparison to the van Genuchten‐Mualem Model
- MathematicsWater Resources Research
- 2020
Modeling soil hydraulic properties requires an effective representation of capillary and noncapillary storage and conductivity. This is made possible by using physically comprehensive yet flexible…
Extension of the Gardner exponential equation to represent the hydraulic conductivity curve
- Engineering
- 2019
Abstract The relative hydraulic conductivity curve Kr(h) = K/Ks is a key variable in soil modeling. This study proposes a model to represent Kr(h), the so-called Gardner dual (GD) model, which…
Measured and Modeled Unsaturated Hydraulic Conductivity of a Walla Walla Silt Loam
- Mathematics
- 2001
There are numerous methods of estimating unsaturated soil hydraulic conductivity [K(θ)], ranging from direct measurement in the laboratory or field, to models that use only basic soil data, e.g.,…
Inverse Analysis of Upward Water Flow in a Groundwater Table Lysimeter
- Environmental Science
- 2005
The accuracy of numerical water flow models for the vadose zone depends on the estimation of the soil hydraulic properties. In this study, the hydraulic parameters for a silty clay soil in a large…
Estimating the unsaturated hydraulic conductivity of Andisols using the evaporation method
- Chemistry
- 2013
Parameters of the bimodal van Genuchten (VG) hydraulic functions for two aggregated Andisols were in- versely determined using the evaporation method. Initial estimates of the water retention…
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…
Estimating the unsaturated hydraulic conductivity from theoretical models using simple soil properties
- Chemistry
- 1995
EVALUATION OF SPATIAL DISTRIBUTION OF HYDRAULIC CONDUCTIVITY USING EFFECTIVE POROSITY DATA
- Mathematics
- 1989
The use of spatial distribution of effective porosity (Φϵ) to estimate the distribution of saturated hydraulic conductivity (K2) is evaluated on five new soils and on a combination of soils. The K2…
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…
Three‐parameter lognormal distribution model for soil water retention
- Geology
- 1994
Many models for soil water retention have been proposed. However, most of these models are curve-fitting equations and do not emphasize the physical significance of their empirical parameters. A new…