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Physically Based Estimation of Soil Water Retention from Textural Data: General Framework, New Models, and Streamlined Existing Models

^a USGS, 345 Middlefield Rd., Menlo Park, CA 94025
^b Dep. of Applied Physics, Univ. of Córdoba, Spain

View larger version (18K): [in this window] [in a new window]   FIG. 1. Cumulative particle-size distributions of the three test media.

View larger version (20K): [in this window] [in a new window]   FIG. 2. Proportional cylinder (PC) model with four values of the proportionality constant (CPC) applied to the three test media: S58NJ-12-2, PODL-1-6.6, and SC2.

View larger version (24K): [in this window] [in a new window]   FIG. 3. The Arya–Dierolf (AD) model with hAD = 10 mm compared with the proportional cylinder (PC) model with CPC = 1000 and the original Arya–Paris (AP) model applied to the three test media.

View larger version (23K): [in this window] [in a new window]   FIG. 4. The Arya–Paris (AP) model with 13 intervals, the continuous near-equivalent of the AP (CNEAP) model, and the uniform-mass-distribution version of the continuous near-equivalent of the AP (UCNEAP) model, all with = 1.38, applied to the three test media.