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Van Genuchten-Mualem model

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(a) Variable tortuosity (τ a ) based <b>van</b> <b>Genuchten</b>–<b>Mualem</b> <b>model</b> predictions...
Published: 01 May 2006
Fig. 8. (a) Variable tortuosity (τ a ) based van GenuchtenMualem model predictions and unsaturated hydraulic conductivity, K , measurements and (b) the standard van GenuchtenMualem model predictions and K measurements (the solid line represents the regression line and the dotted line
Journal Article
Published: 01 May 2011
Vadose Zone Journal (2011) 10 (2): 618-623.
... close approximations of the analytical results. The newly proposed equations allow the use of independent values of the parameters m and n in the soil water retention model of van Genuchten for subsequent prediction of the van GenuchtenMualem and van Genuchten–Burdine hydraulic conductivity models...
FIGURES
Journal Article
Published: 01 November 2007
Vadose Zone Journal (2007) 6 (4): 913-924.
... connectivity–tortuosity tensor ( L i ) were inversely estimated using the Subsurface Transport Over Multiple Phases (STOMP) numerical simulator coupled with the parameter estimation code, UCODE. Results show that six of eight parameters required for a modified van GenuchtenMualem model could be inversely...
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Journal Article
Published: 01 July 2015
Vadose Zone Journal (2015) 14 (7): vzj2014.09.0121.
... the entire range of matric potentials for the illustrative soils compared with the van GenuchtenMualem model (VGM), while maintaining the same number of adjustable parameters. The improved performance of the proposed model demonstrates the advantage of incorporating surface roughness in the pore-scale-based...
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Journal Article
Published: 01 August 2002
Vadose Zone Journal (2002) 1 (1): 137-149.
...Zhiming Lu; Dongxiao Zhang Abstract In this study, on the basis of the van GenuchtenMualem constitutive relationship, we develop a general nonstationary stochastic model for transient, variably saturated flow in randomly heterogeneous media with the method of moment equations. We first derive...
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Journal Article
Published: 01 November 2010
Vadose Zone Journal (2010) 9 (4): 795-820.
...H. Vereecken; M. Weynants; M. Javaux; Y. Pachepsky; M. G. Schaap; M.Th. van Genuchten Abstract We reviewed the use of the van GenuchtenMualem (VGM) model to parameterize soil hydraulic properties and for developing pedotransfer functions (PTFs). Analysis of literature data showed that the moisture...
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Journal Article
Published: 01 January 2006
Vadose Zone Journal (2006) 5 (1): 27-34.
... Soil Science Society of America 2006 FMVG, Mualemvan Genuchten model with fitted values for K o and L MMVG, modified Mualemvan Genuchten MVVG-A, modified Mualemvan Genuchten refitted with standard retention parameters ( h s = 0) MVG, Mualemvan Genuchten TMVG, traditional Mualem...
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<b>van</b> <b>Genuchten</b> α profiles for (a) the <b>Mualem</b> <b>model</b> and (b) the Childs and Co...
Published: 01 November 2004
Fig. 8. van Genuchten α profiles for (a) the Mualem model and (b) the Childs and Collis-George model.
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<b>van</b> <b>Genuchten</b>  N  profiles for (a) the <b>Mualem</b> <b>model</b> and (b) the Childs and ...
Published: 01 November 2004
Fig. 9. van Genuchten N profiles for (a) the Mualem model and (b) the Childs and Collis-George model.
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Soil characteristic curves <b>modeled</b> with <b>van</b> <b>Genuchten</b>–<b>Mualem</b> equations. (A)...
Published: 01 August 2012
Fig. 2. Soil characteristic curves modeled with van GenuchtenMualem equations. (A) Water retention curve; (B) soil hydraulic conductivity curve.
Journal Article
Published: 01 February 2009
Vadose Zone Journal (2009) 8 (1): 86-95.
...M. Weynants; H. Vereecken; M. Javaux Abstract We revisited the Vereecken database, which has been used to derive pedotransfer functions (PTFs) to estimate the soil hydraulic parameters of Belgian soils. We developed new PTFs based on the Mualemvan Genuchten model, constraining m = 1 − 1/ n...
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Ratio of the Durner bimodal to the <b>Mualem</b>–<b>van</b> <b>Genuchten</b> unsaturated hydraul...
Published: 01 January 2014
Fig. 7. Ratio of the Durner bimodal to the Mualemvan Genuchten unsaturated hydraulic conductivities (KDBM/KMvG) as a function of pressure head, h , which were retrieved for the different time periods (in Day of the Year, DOY) from brightness temperatures using (a) the coherent radiative
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Normalized parameter ranges for each of the <b>Mualem</b>–<b>van</b> <b>Genuchten</b> parameters...
Published: 01 May 2008
F ig . 7. Normalized parameter ranges for each of the Mualemvan Genuchten parameters in the HYDRUS-1D model using the three-criteria { F 0.4 , F 1.0 , F 2.6 } calibration with AMALGAM. Each line going from left to right across the plot denotes a single Pareto solution. The squared plot
Journal Article
Published: 01 February 2003
Vadose Zone Journal (2003) 2 (1): 98-113.
...Jasper A. Vrugt; Willem Bouten; Hoshin V. Gupta; Jan W. Hopmans Abstract We present a thorough identifiability analysis of the soil hydraulic parameters in the parametric models of Brooks and Corey (BC; Brooks and Corey, 1964 ), Mualemvan Genuchten (VG; van Genuchten, 1980 ), and Kosugi (KC...
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Journal Article
Published: 01 May 2006
Vadose Zone Journal (2006) 5 (2): 764-776.
...Fig. 8. (a) Variable tortuosity (τ a ) based van GenuchtenMualem model predictions and unsaturated hydraulic conductivity, K , measurements and (b) the standard van GenuchtenMualem model predictions and K measurements (the solid line represents the regression line and the dotted line...
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Journal Article
Published: 01 August 2007
Vadose Zone Journal (2007) 6 (3): 638-650.
... one particular model parameterization across the various aggregation levels, the optimal Mualemvan Genuchten parameters for a coarser aggregation level can be derived from an underlying level by simple arithmetic averaging. The different performance indices (RMSE, index of agreement, and Nash...
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Journal Article
Published: 01 November 2004
Vadose Zone Journal (2004) 3 (4): 1072-1081.
... Richards equation using the Mualemvan Genuchten parameterization. Both model inversions are formulated by the classical least-squares problem and are performed iteratively using advanced global optimization techniques. Compared with time domain reflectometry (TDR), results demonstrated the appropriateness...
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Journal Article
Published: 01 January 2014
Vadose Zone Journal (2014) 13 (1): vzj2013.04.0075.
...Fig. 7. Ratio of the Durner bimodal to the Mualemvan Genuchten unsaturated hydraulic conductivities (KDBM/KMvG) as a function of pressure head, h , which were retrieved for the different time periods (in Day of the Year, DOY) from brightness temperatures using (a) the coherent radiative...
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Journal Article
Published: 01 December 2014
Vadose Zone Journal (2014) 13 (12): vzj2014.07.0099.
... in the Rollesbroich catchment (Germany). Hydraulic properties were described by the van GenuchtenMualem (VGM) model and were estimated by inverse modeling of soil water content data using the Hydrus-1D model for each location. The feasible parameter space for the inverse modeling was derived using the Rosetta...
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Journal Article
Published: 01 January 2017
Vadose Zone Journal (2017) 16 (1): 1-16.
... and transpiration modules were combined to generate the six different model configurations; the other submodules were the same in every model configuration. Submodule(s) of Expert-N Name Reference Pedotransfer functions Campbell Campbell (1986) Hydraulic functions van Genuchten and Mualem van...
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