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Measuring Hysteretic Hydraulic Properties of Peat and Pine Bark using a Transient Method

Unité Mixte de Recherche A_462 ‘SAGAH’ INRA/INH/Université d‘Angers, Sciences Agronomiques Appliquées à l‘Horticulture, 2 rue Le Nôtre, 49045 Angers Cedex, France

View larger version (33K): [in a new window]   Fig. 1. Schematic representation of the experimental design.

View larger version (23K): [in a new window]   Fig. 2. A comparison between observed data (symbols) and curves calculated with the equations of Topp et al. (1980), Pepin et al. (1992), and the -model (Roth et al., 1990). Each curve was simultaneously fitted to the data from the three replicate experiments for (a) peat and for (b) pine bark.

View larger version (39K): [in a new window]   Fig. 3. Measured (symbols) and fitted (lines, VG) water retention curves during drying and wetting for (a) peat and (b) pine bark. Squares, diamonds, and triangles correspond to Replicates 1 to 3, respectively.

View larger version (46K): [in a new window]   Fig. 4. Calculated (symbols) and predicted (lines) hydraulic conductivity as a function of volumetric water content for (a) peat and (b) pine bark. The drying and wetting hydraulic conductivity curves (van Genuchten–Mualem [VGM]) were predicted (Eq. [4]) from the fitted drying and wetting water retention curves (Eq. [2]).

View larger version (45K): [in a new window]   Fig. 5. Calculated (symbols) and predicted (lines) hydraulic conductivity as a function of volumetric water content for (a) peat and (b) pine bark. The drying and wetting hydraulic conductivity curves (BC) were predicted (Eq. [5]) from the fitted drying and wetting water retention curves (Eq. [2]).

View larger version (50K): [in a new window]   Fig. 6. Calculated (symbols) and predicted (lines) hydraulic conductivity as a function of water potential for (a) peat and (b) pine bark. The drying and wetting hydraulic conductivity curves (VGM) were predicted (Eq. [3]) from the fitted drying and wetting water retention curves (Eq. [2]).