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DIVISION S-1-SOIL PHYSICS

Measuring Hydraulic Properties Using a Line Source

II. Field Test

^a School of Geography and Geology, McMaster Univ., Hamilton, ON, Canada L8S 4M1
^b Dep. of Land Resource Science, Univ. of Guelph, Guelph, ON, Canada N1G 2W1
^c Graduate Studies and Research, Univ. of Saskatchewan, Rm 50 Murray Bldg, 3 Campus Drive, Saskatoon, SK, Canada S7N 5A4

gparkin{at}lrs.uoguelph.ca

We designed and tested a field method to measure unsaturated soil hydraulic properties using multi-purpose time domain reflectometry (TDR) probes below a surface line source with constant flux of water. The surface line source was produced with a moving irrigation system at a field site sheltered from precipitation. Two hundred multi-purpose TDR probes were vertically installed in the soil beneath the line source to measure soil water pressure head (), water storage (W), and tracer travel time (T). The soil hydraulic properties, the inverse macroscopic capillary length (), hydraulic conductivity at saturation (K_s), and soil water content at saturation (_s) were estimated by inverse procedures with new analytical expressions. Five combinations of measurement sets, namely W-only, and W, and T, and W and T, and and W and T were used. Approximate confidence contours in the –K_s plane were calculated to show the precision of the parameter estimates. For comparison, hydraulic properties were also measured by means of the Guelph Permeameter (GP) and the modified Guelph Pressure Infiltrometer (GPI) systems. Hydraulic parameters estimated from only W measurements were similar to those estimated from the combinations of W and , or W and T, or W and and T. The estimated hydraulic parameters were similar to those obtained with three-dimensional (3-D) infiltration measurements by means of the GP and GPI systems.

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