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Published online 16 November 2005
Published in Vadose Zone J 4:1080-1086 (2005)
DOI: 10.2136/vzj2004.0139
© 2005 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Right arrow Soil Thermal Properties
Right arrow Time Domain Reflectometry, TDR

Comparing Heat-Pulse and Time Domain Reflectometry Soil Water Contents from Thermo-Time Domain Reflectometry Probes

Tusheng Rena, Zhaoqiang Jua, Yuanshi Gonga and Robert Hortonb,*

a Dep. of Soil and Water, China Agric. Univ. Beijing, China 100094
b Dep. of Agronomy, Iowa State Univ., Ames, IA 50011


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  		Fig. 1. Time domain reflectometry (TDR) waveforms of the thermo-TDR probe in water, in air, and shorted at the cylinder base in air. L0 is the distance of the first reflection determined by shorting at the cylinder base in air. Lw is the distance of the second reflection calibrated in distilled water. The two dashed lines near the water curve are tangent lines used to determine the end of probe reflection position.

 


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  		Fig. 2. Soil temperature change ({Delta}T) at a sensor cylinder as related to the position of the heater cylinder. The numerical values indicate the distance of the heater cylinder to the wall of the glass container.

 


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  		Fig. 3. Thermo-time domain reflectometry measured relative dielectric permittivity (Ka) of water as related to water level above the central cylinder.

 


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  		Fig. 4. Comparison of time domain reflectometry measured water content ({theta}TDR) and heat-pulse measured water content ({theta}HP) vs. volumetric water content ({theta}G) determined gravimetrically on repacked soil samples.

 


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  		Fig. 5. Comparison of TDR measured water content ({theta}TDR) and heat-pulse measured water content ({theta}HP) vs. volumetric water content ({theta}G) determined gravimetrically on undisturbed soil cores.

 




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