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Applicability of Uni- and Bimodal Retention Functions for Water Flow Modeling in a Tropical Acrisol

Univ. of Hohenheim, Inst. of Soil Science and Land Evaluation, 70593 Stuttgart, Germany

View larger version (17K): [in a new window]   Fig. 1. Upper (potential evaporation, Epot) and lower (averaged pressure head in 70-cm depth) boundary conditions of the one-dimensional transient flow experiment.

View larger version (27K): [in a new window]   Fig. 2. Retention measurements, optimized soil water retention curves, and associated pore size distributions. VG = van Genuchten (1980), MVG = modified van Genuchten (Vogel and Cislerova 1988), and BVG = bimodal van Genuchten (Durner 1994). The circles in 25 and 45 cm of VG highlight the third small pore size maximum.

View larger version (26K): [in a new window]   Fig. 3. Hydraulic conductivity measurements (k2 and kIPM data) and optimized conductivity functions. The shapes of the functions near saturation (small diagrams) and the respective hydraulic conductivities at saturation (Ks) are depicted within each diagram. VG = van Genuchten (1980), MVG = modified van Genuchten (Vogel and Cislerova 1988), and BVG = bimodal van Genuchten (Durner 1994).

View larger version (32K): [in a new window]   Fig. 4. Measured water content and pressure head data of the one-dimensional transient flow experiment and modeling with optimized hydraulic properties. VG = van Genuchten (1980), MVG = modified van Genuchten (Vogel and Cislerova, 1988), and BVG = bimodal van Genuchten (Durner, 1994).