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DIVISION S-1—SOIL PHYSICS

Improvements to Estimating Unsaturated Soil Properties from Horizontal Infiltration

The University of Tennessee, 2506 E.J. Chapman Drive, Knoxville, TN 37996-4531

^* Corresponding author (jtyner{at}utk.edu).

Current methods to determine unsaturated soil properties are expensive, difficult, and time-consuming. A procedure is presented that quickly estimates the unsaturated hydraulic conductivity, diffusivity, water retention, and sorptivity functions from a Bruce–Klute test in conjunction with a semi-analytic analysis. Data collection was performed using a computer controlled -ray attenuation system to measure moisture content. A computer controlled syringe pump maintained the inlet boundary conditions. Improvements to existing analytical procedures include the independent optimization of van Genuchten soil hydraulic parameters n and , and a method to optimize the residual moisture content from a single measurement of water potential versus water content. The method was applied to a sandy loam and its strengths and weaknesses are discussed.