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Published online 16 December 2005
Published in Vadose Zone J 5:27-34 (2005)
DOI: 10.2136/vzj2005.0005
© 2005 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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A Modified Mualem–van Genuchten Formulation for Improved Description of the Hydraulic Conductivity Near Saturation

Marcel G. Schaap* and Martinus Th. van Genuchten

USDA-ARS, George E. Brown, Jr. Salinity Lab., 450 W. Big Springs Rd., Riverside, CA 92507

Figure 1
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  		Fig. 1. Textural distribution of samples used in this study and the delineation of the four textural groups.

 

Figure 2
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  		Fig. 2. Dependence of relative RMSE on values of hs for the four textural groups used in this study: (a) water retention, (b) hydraulic conductivity, and (c) the mean of water retention and conductivity.

 

Figure 3
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  		Fig. 3. Average scaled conductivities, R (Eq. [16]), for pressure heads between 0 and –100 cm. The averages were calculated for pressure intervals of 1 cm between 0 and –10 cm, 2 cm between –10 and –50 cm, and intervals of –5 cm between –50 and –100 cm. The piece-wise linear curve indicates the most optimal path through the data between –40 and 0 cm (Eq. [14]).

 

Figure 4
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  		Fig. 4. Mean errors (ME) for nine pressure head classes for the soil textural groups. The number of observations in each pressure class is indicated with the gray bars (right axis). Note that the scale on the right axis is not the same for all graphs.

 




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