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United States Department of Agriculture

Agricultural Research Service

Title: Measuring the Hysteretic Behavior of the Hydraulic Conductivity Pressure Head Function for a Dune Sand

item Shouse, Peter
item Tseng, P - U.C. RIVERSIDE

Submitted to: Agronomy Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: September 19, 1995
Publication Date: N/A

Technical Abstract: Data required to describe the K-h-theta functions throughout hysteresis loops are difficult to obtain. A laboratory column was instrumented with porous plates and a precision water pump. The pump incremented steady flow rates. Soil-water tensions and water contents were measured in an initially dry dune sand. These data were used to estimate the main wetting curve for the K-h-theta hysteresis function. Once saturation was achieved, the pump decremented steady flow rates and the main-drying curve for the K-h-theta hysteresis function was obtained. The pump control and data acquisition were fully automated and, therefore, obtaining scanning loops is possible. Obtaining data for measuring the hysteretic behavior of the K-h-theta function normally takes months of tedious work, but we obtained the data needed in less than one month.

Last Modified: 4/22/2015
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