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A Flexible Water Content Probe for Unsaturated Soil Column Experiments

^a Geosciences Dep.
^b Biological Sciences Dep.
^c Information and Communication Systems Dep., Idaho National Lab., Idaho Falls, ID 83415
^d Biological and Agricultural Engineering Dep., Univ. of Idaho, Idaho Falls, ID 83415

View larger version (21K): [in a new window]   Fig. 1. (a) Plan and (b) cross-sectional view of the flexible capacitance probe attachment to the column. (c) Picture of a flexible electrode prototype in a soil column; (d) picture of the standard EC-10 probe inserted horizontally across the column.

View larger version (18K): [in a new window]   Fig. 2. Probe response (normalized to an electrode length of 9.5 cm) versus normalized electrode length (cm/9.5 cm) for the flexible and rigid probes.

View larger version (16K): [in a new window]   Fig. 3. Plot of probe response versus water content for a flexible electrode with soil in contact on both sides and a flexible electrode attached to a plastic sheet with soil in contact on a single side.

View larger version (18K): [in a new window]   Fig. 4. Plot of a rigid probe inserted through a soil column and a flexible probe attached to a column wall as a function of water content of the quartz sand.