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

By M. G. Schaap, F. Leij. 2000

460 citations recorded by the source corpus.

Subfields: Civil and Structural Engineering, Environmental Engineering, Geophysics

View Paper: https://www.semanticscholar.org/paper/a9555c29a790d3c0c4e95ce9b554948141add405

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Citations in the corpus

Use of the Nonparametric Nearest Neighbor Approach to Estimate Soil Hydraulic Properties (2006, methodology): “Recently, artificial NNet models have been used successfully in PTF development (e.g., Pachepsky et al., 1996; Tamari et al., 1996; Schaap et al., 1998; Koekkoek and Booltink, 1999; Minasny et al., 1999; Schaap and Leij, 2000; Minasny and McBratney, 2002; Nemes et al., 2003).”
Inverse Estimation of the Unsaturated Soil Hydraulic Properties from Column Outflow Experiments Using Free‐Form Parameterizations (2004, methodology): “We parameters in the van Genuchten–Mualem functions) canbelieve that the data should decide the optimum number be misleading (Schaap and Leij, 2000) since this ignoresof degrees of freedom.”
Linearized Richards' equation approach to pumping test analysis in compressible aquifers (2006, background): “Such a steep drop in conductivity is not commonly observed from small-scale measurements [e.g., Schaap and Leij, 2000].”
Multiresponse multilayer vadose zone model calibration using Markov chain Monte Carlo simulation and field water retention data (2011, methodology): “…used median Ks - values from laboratory analysis of soil samples, fixed the pore connectivity parameter l to values of 0.5 [Mualem, 1978] and alternatively 1.0 [Schaap and Leij, 2000], and directly fitted the shape parameters n and of the MVG model to the retention data depicted in Figure 2.”
A new capillary and thin film flow model for predicting the hydraulic conductivity of unsaturated porous media (2010, background): “The physical meaning of parameter l is often questioned given that its fitted value is frequently found to be negative [Schaap and Leij, 2000].”
ROSETTA: a computer program for estimating soil hydraulic parameters with hierarchical pedotransfer functions (2001, methodology): “Although this leads to some theoretical complications, negative L values give far better results (cf., Kosugi, 1999; Schaap and Leij, 1999).”
Using Pedotransfer Functions to Estimate the van Genuchten–Mualem Soil Hydraulic Properties: A Review (2010, methodology): “In an analysis of a subset of the UNSODA database using a similar approach to that of Mualem (1976), Schaap and Leij (2000) found an optimal value of −1 for l. Comparisons of the performance of the VGM model using UNSODA have been partly hampered by the fact that diff erent subsets with various…”
An objective analysis of the dynamic nature of field capacity (2009, methodology): “While the analytical expression shown above used the Brooks and Corey parameters [Brooks and Corey, 1964], Schaap and Leij [2000] , among others, have shown that the van Genuchten-Mualem model[vanGenuchten,1980]isabetterapproximationofthe hydraulic behavior of many soils.”
Simple consistent models for water retention and hydraulic conductivity in the complete moisture range (2013, background): “However, its physical meaning must be questioned [Hoffmann-Riem et al., 1999], and is often treated as a free fitting parameter that is frequently negative [Schaap and Leij, 2000].”