661 Soil Moisture: Advances in Design and Development of Water Content, Matric Potential, and Flux Measurement Methods for the Critical Zone: I

Oral Session
S01 Soil Physics
This session presents recent developments in design, developments, and applications of techniques for measuring soil-water content, soil-water matric potential, and soil-water flux at different depth and scale in the soil vadose zone. Techniques include dielectric (e.g. Time Domain Reflectometry) and thermal methods (e.g. Heat Pulse) for water content and flux, and tensiometer-based methods and porous matrix sensors for matric potential. The session will cover both numerical analysis and laboratory and field tests regarding sensitivity, accuracy, and scale when measuring and monitoring the soil moisture status, storage, flux and evaporation from the critical zone.
Tuesday, 7 October 2008: 8:55 AM-11:45 AM
George R. Brown Convention Center, 362F

Scott Jones
8:55 AM
Introductory Remarks
9:00 AM
Soil Water Content Derived from Frequency-Dependent Permittivity using a Portable Network Analyzer and Open-Ended Dielectric Probe.
Scott Jones, Utah State University; Ricardo Estevez, Utah State University; David Robinson, University of the West Indies
9:15 AM
9:45 AM
In Situ Assessment of Heat-Pulse and Thermal Profile Methods for Measuring Streambed Recharge/Discharge.
Francis Casey, North Dakota State Univ.; Tyson Ochsner, USDA-ARS; Dan Jaynes, USDA-ARS; Robert Horton, Iowa State Univ.
10:15 AM
10:30 AM
Analysis of Coaxial Soil Cell.
Mathew Pelletier, USDA-ARS; Robert Schwartz, USDA-ARS; Steven Evett, USDA-ARS; Bobbie McMichael, USDA-ARS; Robert Lascano, USDA-ARS; Dennis Gitz, USDA-ARS; Jeffrey Baker, USDA-ARS; Paxton Payton, PSGD, CSRL
10:45 AM
Using Impedance Spectroscopy to Characterize the Moisture in Porous Media.
Martin G. Buehler, Decagon Devices; Douglas Cobos, Decagon Devices; Colin Campbell, Decagon Devices, Inc.; Gaylon Campbell, Decagon Devices, Inc.
11:00 AM
How to Measure Low Matric Potentials with a Combination of Water-Filled Tensiometers and Porous-Matrix Sensors.
William Whalley, Rothamsted Research; Christopher W. Watts, Rothamsted Research; Gary Lock, Delta-T Devices,; Dick Jenkins, Delta-T Devices, Ltd; Jos Balendonck, Plant Research International B.V.
11:15 AM
Monitoring the Soil Water Potential with Polymer Tensiometers in Cropped Lysimeters under Water-Stressed Conditions.
Martine van der Ploeg, Wageningen University & Research Centre; Harm Gooren, Wageningen University & Research Centre; Gerben Bakker, Wageningen University & Research Centre; Gerrit De Rooij, Wageningen University & Research Centre
11:30 AM
Design Considerations for Water Fluxmeters.
Glendon Gee, Battelle Pacific NW Lab.; Fred Zhang, Battelle Pacific NW Lab.; Jason Keller, GeoSystems Analysis, Inc.; Douglas Cobos, Decagon Devices, Inc.; Gaylon Campbell, Decagon Devices, Inc.
11:45 AM
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