Automatic, real-time monitoring of soil moisture in a remote field area with time domain reflectometry

1991 ◽  
Vol 27 (5) ◽  
pp. 857-864 ◽  
Author(s):  
W. N. Herkelrath ◽  
S. P. Hamburg ◽  
Fred Murphy
Keyword(s):  
Soil Moisture ◽  
Real Time ◽  
Time Domain ◽  
Time Domain Reflectometry ◽  
Real Time Monitoring ◽  
Field Area

Advanced Measurement Methods in Time Domain Reflectometry for Soil Moisture Determination

2006 ◽  
pp. 317-347 ◽  
Author(s):  
Christof Huebner ◽  
Stefan Schlaeger ◽  
Rolf Becker ◽  
Alexander Scheuermann ◽  
Alexander Brandelik ◽  
...  
Keyword(s):  
Soil Moisture ◽  
Time Domain ◽  
Time Domain Reflectometry ◽  
Measurement Methods ◽  
Moisture Determination

scholarly journals Two- and three-parameter calibrations of time domain reflectometry for soil moisture measurement

1997 ◽  
Vol 33 (10) ◽  
pp. 2417-2421 ◽  
Author(s):  
C. Yu ◽  
A. W. Warrick ◽  
M. H. Conklin ◽  
M. H. Young ◽  
M. Zreda
Keyword(s):  
Soil Moisture ◽  
Time Domain ◽  
Time Domain Reflectometry ◽  
Moisture Measurement ◽  
Soil Moisture Measurement

Comparison of Standing Wave Ratio, Time Domain Reflectometry and Gravimetric Method for Soil Moisture Measurements

2011 ◽  
Vol 9 (3) ◽  
pp. 1140-1143 ◽  
Author(s):  
Lei Feng ◽  
Yiming Wang ◽  
Weizhong Yang ◽  
Qinglan Shi
Keyword(s):  
Soil Moisture ◽  
Standing Wave ◽  
Time Domain ◽  
Gravimetric Method ◽  
Time Domain Reflectometry

Impact of density on the hydraulic properties of peat and the time domain reflectometry (TDR) moisture calibration curve

2005 ◽  
Vol 42 (1) ◽  
pp. 279-286 ◽  
Author(s):  
Anushka Shibchurn ◽  
Paul J Van Geel ◽  
Paula L Kennedy
Keyword(s):  
Dielectric Constant ◽  
Soil Moisture ◽  
Water Content ◽  
Time Domain ◽  
Calibration Curve ◽  
Hydraulic Properties ◽  
Time Domain Reflectometry ◽  
Organic Soils ◽  
Dry Density ◽  
Water Contents

The hydraulic properties of a peat used in a commercial peat biofilter were evaluated to determine their relationship with density and to establish a time domain reflectometry (TDR) calibration curve for water content as a function of the measured dielectric constant. The peat studied was a milled Sphagnum peat with a high organic content (99%). The dry densities evaluated in this study ranged from 90 to 180 kg/m3. The saturated hydraulic conductivity (Ks) decreased with an increase in dry density (ρdry) and was found to follow a log-linear relationship (Ks = 0.2462 exp(–0.0438ρdry), correlation coefficient R2 = 0.9789). As expected, the soil moisture curve was impacted by density, with a higher density resulting in higher water contents for a given suction. The data were fit to the van Genuchten relationship. A TDR calibration curve was generated at five different densities. A comparison of the curves indicates that the water content as a function of dielectric constant was not dependent on density because of the significantly larger dielectric constant (Ka) of water compared with those of peat solids and air-filled voids. The TDR calibration curve for the peat evaluated in this study (volumetric water content Θv = 0.2667 ln(Ka) – 0.1405, R2 = 0.9564) predicted higher water contents for a given dielectric constant compared with those from similar calibration curves for peat published in the literature. The data were compared with those from six other studies and indicated that the TDR calibration varied for different organic soils. The density-dependent hydraulic parameters and TDR calibration curve are important parameters needed to study the hydraulics of peat biofilters.Key words: peat, TDR, time domain reflectometry, density, hydraulics, soil moisture.

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