Tuesday, 7 October 2008: 10:45 AM

George R. Brown Convention Center, 362F

Martin G. Buehler¹, Douglas R. Cobos¹, Colin Campbell² and Gaylon Campbell³, (1)Research and Development, Decagon Devices, 2365 NE Hopkins Court, Pullman, WA 99163
(2)Decagon Devices, Inc., Decagon Devices Inc, 2365 NE Hopkins Ct., Pullman, WA 99163-5601
(3)Decagon Devices, Inc., Decagon Devices Inc., 2365 NE Hopkins Ct., Pullman, WA 99163-5601

Electrical impedance spectroscopy was used to study the behavior of water in sandy soils. In these studies, impedance and its phase angle were measured between 100 Hz and 100 MHz. The data were transformed into Cole-Cole plots which reveal several relaxation mechanisms over this frequency range. In addition, loss tangent graphs indicate that there is more dispersion with frequency in moist sand samples than in free water indicating that the water is bound differently in the sand than in bulk water. Finally, the graph of relaxation time versus dielectric constant indicates how tightly the water is being held for each mechanism.

See more of: Soil Moisture: Advances in Design and Development of Water Content, Matric Potential, and Flux Measurement Methods for the Critical Zone: I
See more of: S01 Soil Physics

2008 Joint Annual Meeting (5-9 Oct. 2008): Using Impedance Spectroscopy to Characterize the Moisture in Porous Media.

661-7 Using Impedance Spectroscopy to Characterize the Moisture in Porous Media.