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

U.S. Salinity Lab., USDA-ARS, 450 W. Big Springs Road, Riverside, CA 92507 USA

View larger version (37K): [in a new window]   Fig. 1 Effect of variations in L on unsaturated conductivity terms in Eq. [4]: L log10(Se) (a) and log10[(K(Se)/Ko]) for (b) and (c). The dashed lines in (b) and (c) indicate the position of the third term of Eq. [4]

View larger version (38K): [in a new window]   Fig. 2 Textural distribution of the 235 samples and the classification in four textural groups

View larger version (23K): [in a new window]   Fig. 3 RMSEK curves for various values of L for the five textural groups

View larger version (60K): [in a new window]   Fig. 4 Predicted unsaturated hydraulic conductivities for the sand and clay retention parameters listed in Table 1 for Model A, B2, and C2. Predicted Ko and L parameters for Models B2 and C2 are listed in the tables with their uncertainties as generated by the bootstrap method in parenthesis. The shaded area's indicate the 90% confidence interval of the predicted hydraulic conductivities for Model C2