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Published online 26 May 2006
Published in Vadose Zone J 5:805-808 (2006)
DOI: 10.2136/vzj2006.0139
© 2006 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Right arrow Soil Methods/Instrumentation
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Right arrow Laboratory Column Studies

A Flexible Water Content Probe for Unsaturated Soil Column Experiments

E. D. Mattsona,*, K. E. Bakera, C. D. Palmera, C. R. Breckenridgeb, J. M. Svobodac and R. W. Smithd

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


Figure 1
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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.

 

Figure 2
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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.

 

Figure 3
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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.

 

Figure 4
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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.

 





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