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Correcting Laboratory Retention Curves for Hydrostatic Fluid Distributions

Dep. of Agronomy and Soils, Auburn Univ., Auburn AL 36849-5412

View larger version (32K): [in a new window]   Fig. 1. Geometrical interpretation of Eq. [21], for A > 0 and B > 0. At a given capillary pressure head value hc, the physical point nonwetting fluid content corresponds to the arched area (rectangles), while the measured nonwetting fluid content corresponds to the area under the dn / dc curve

View larger version (14K): [in a new window]   Fig. 2. Numerical validation of Eq. [21] on hypothetical data. The solid line corresponds to the physical point retention curve (Eq. [26]), and the open circles resulted from the application of Eq. [21] to the hypothetical pressure cell curve (dashed line, Eq. [27])

View larger version (13K): [in a new window]   Fig. 3. Gamma radiation measurements of the physical point retention curve. The measurements at z = 3 cm are represented by solid circles. Open circles represent measurements at five other locations along the 10-cm-high column

View larger version (20K): [in a new window]   Fig. 4. Application of Eq. [21] (dashed line) and [24] (dash-dotted line) to the Haines' apparatus data (open circles and solid line). The obtained curves are compared with physical point data (solid circles)

View larger version (23K): [in a new window]   Fig. 5. Comparison between the results of this study and the procedure of Liu and Dane (1995), using the Brooks and Corey (1964) retention model