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Testing an Infiltration Method for Estimating Soil Hydraulic Properties in the Laboratory

^a Institut National de la Recherche Agronomique, CSE Batiment Sols, Domaine Saint Paul, Site Agroparc, 84914 Montfavet Cedex 9, France
^b Laboratoire d'Etude des Transferts en Hydrologie et Environnement, LTHE, UMR 5564 (CNRS, INPG, UJF), B.P.53, 38041 Grenoble Cédex 9, France

View larger version (31K): [in a new window]   Fig. 1. Schematic representation of Wind's procedure for estimating the retention curve and the hydraulic conductivity–water content relationship under infiltration conditions (we and wm are gravimetric or volumetric water contents).

View larger version (41K): [in a new window]   Fig. 2. Schematic representation of the experimental design: (1) pulsing pump, (2) drip infiltrometer, (3) soil cylinder, (4) microtensiometers, (5) electronic unit, (6) weighing device, (7) multiplexer, (8) datalogger, and (9) microcomputer.

View larger version (13K): [in a new window]   Fig. 3. Simulated water potential versus time at several depths in a soil column under infiltration conditions (a) sandy soil (b) loamy soil.

View larger version (11K): [in a new window]   Fig. 4. Comparison between the theoretical (dotted line) and estimated (continuous line) retention curves in numerical experiments with the infiltration method without measurement errors on tensiometric data (a) sandy soil (b) loamy soil.

View larger version (17K): [in a new window]   Fig. 5. Simulated (symbols) and fitted (continuous line) water content profiles at several times in a soil column under infiltration conditions (a) sandy soil (b) loamy soil.

View larger version (18K): [in a new window]   Fig. 6. Residuals (m3 m-3) of the water content profile fitting according to Eq. [1] during the simulated infiltration (a) sandy soil (b) loamy soil.

View larger version (10K): [in a new window]   Fig. 7. Comparison between the theoretical (continuous line) and estimated (symbols) hydraulic conductivity–water content relationship in numerical experiments with the infiltration method for the sandy soil (a) no error on tensiometric measurements (b) ± 2 x 10-3 m on tensiometric measurements (c) ± 5 x 10-3 m on tensiometric measurements.

View larger version (12K): [in a new window]   Fig. 8. Comparison between the theoretical (continuous line) and estimated (symbols) hydraulic conductivity–water content relationship in numerical experiments with the infiltration method for the loamy soil (a) no error on tensiometric measurements (b) ± 2 x 10-3 m on tensiometric measurements (c) ± 5 x10-3 m on tensiometric measurements conditions.

View larger version (23K): [in a new window]   Fig. 9. Estimated hydraulic conductivity–water content relationship with Wind's method under infiltration conditions for the sandy soil. The parameter s is not estimated and set to its true value and the Ksat point is an independent measurement.

View larger version (16K): [in a new window]   Fig. 10. Estimated hydraulic conductivity–water content (a) and hydraulic conductivity–water potential (b) relationships with Wind's method under infiltration conditions for the loamy soil. The parameter s is not estimated and set to its true value and the Ksat point is an independent measurement.