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water content reflectometers

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Experimental device used for the calibration of <b>water</b> <b>content</b> <b>reflectometer</b>...
Published: 01 October 2015
Fig. 1. Experimental device used for the calibration of water content reflectometer probes in a large soil sample.
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Layout of CS616 <b>water</b> <b>content</b> <b>reflectometer</b> probes in each plot (not to sca...
Published: 01 May 2011
Fig. 1. Layout of CS616 water content reflectometer probes in each plot (not to scale). Columns of probes are labeled as CT1 to CT4 (conventional tillage 1) and NT1 to NT4 (no-till). Distance to the columns was measured from a reference point located between the two plots and indicated as the x
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Calibration of CS616 <b>water</b> <b>content</b> <b>reflectometer</b> (WCR) using field and labo...
Published: 01 May 2011
Fig. 2. Calibration of CS616 water content reflectometer (WCR) using field and laboratory data ( R 2 = 0.988) in comparison to the calibration equation supplied by the manufacturer (Campbell Scientific, Logan, UT); τ is volumetric water content and θ is the WCR period; Poly. designates
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<b>Water</b> <b>content</b> <b>reflectometer</b> calibration curve for the Rocky Mountain Arsena...
Published: 01 May 2006
Fig. 1. Water content reflectometer calibration curve for the Rocky Mountain Arsenal soils.
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Conceptualization of the <b>water</b> <b>content</b> <b>reflectometer</b> system in the event of...
Published: 01 May 2006
Fig. 5. Conceptualization of the water content reflectometer system in the event of a lightning strike: (A) physical model; and (B) analogous model.
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Response of the analogous model of the <b>water</b> <b>content</b> <b>reflectometer</b> system t...
Published: 01 May 2006
Fig. 6. Response of the analogous model of the water content reflectometer system to a lightning strike at time t ls .
Journal Article
Published: 01 October 2015
Vadose Zone Journal (2015) 14 (10): vzj2015.03.0039.
...Fig. 1. Experimental device used for the calibration of water content reflectometer probes in a large soil sample. ...
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Journal Article
Published: 01 May 2006
Vadose Zone Journal (2006) 5 (2): 673–683.
...Fig. 1. Water content reflectometer calibration curve for the Rocky Mountain Arsenal soils. ...
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Journal Article
Published: 01 January 2006
Vadose Zone Journal (2006) 5 (1): 459–468.
...} \begin{document} \[{\theta}\ =\ {-}\ 0.0663\ {-}\ 0.0063P_{\mathrm{op}}\ +\ 0.0007P_{\mathrm{op}}^{2}\] \end{document} where P op should be expressed in microseconds ( Campbell Scientific, 2003 ). The water content reflectometer used was the CS616 manufactured by Campbell Scientific, which...
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Journal Article
Published: 01 February 2008
Vadose Zone Journal (2008) 7 (1): 22–30.
... was significantly smoother than uncorrected water contents (i.e., ± 0.005 m 3 m −3 in August). The DPHP-derived water contents compared favorably to data from water content reflectometers installed nearby. The results show that soil water content estimates from the LM-Corrected method were substantially less...
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Journal Article
Published: 01 May 2003
Vadose Zone Journal (2003) 2 (2): 270–275.
... (e.g., Tektronix 1520, Tektronix, Beaverton, OR) for collecting waveforms, or a water content reflectometer (e.g., model CS505, Campbell Scientific, Inc., Logan, UT), which provides a direct electrical output, which may be sampled using a data logger. Laboratory calibration experiments and a full-scale...
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Volumetric <b>water</b> <b>content</b> variations at the surface (time domain <b>reflectomet</b>...
Published: 01 February 2008
F ig . 12. Volumetric water content variations at the surface (time domain reflectometry [TDR] probe 1), −0.50 m (TDR probe 2), and −1.15 m (TDR probe 3) below the surface of the infiltration basin during (a) Infiltration Test a (initial “dry” conditions at −1.15 m), and (b) Infiltration Test b
Journal Article
Published: 01 August 2008
Vadose Zone Journal (2008) 7 (3): 992–1000.
... . In S.R. Evett et al. (ed.) Field estimation of soil water content: A practical guide to methods, instrumentation, and sensor technology . Int. Atomic Energy Agency , Vienna . Logsdon , S.D. 2007 . Water content reflectometer calibration and field use . In Abstracts, ASA–CSSA–SSSA...
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Journal Article
Published: 01 May 2006
Vadose Zone Journal (2006) 5 (2): 751–756.
...Ole K. Olmanson; Tyson E. Ochsner Abstract Time domain reflectometry (TDR) and the heat pulse method are both used to measure soil water content. Changes in ambient temperature have been shown to affect TDR measurements, but less is known about the behavior of heat pulse sensors in response...
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Journal Article
Published: 01 November 2004
Vadose Zone Journal (2004) 3 (4): 1169–1179.
... on field-measured L-band (1.4 GHz) microwave emission from a bare soil. Of special interest in this work is the procedure used to transform remotely sensed data to soil water content and its comparability with time domain reflectometer (TDR) in situ measurements. Surface roughness of the soil...
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Journal Article
Published: 01 August 2009
Vadose Zone Journal (2009) 8 (3): 628.
... soil sampling, tensiometers, electrical resistance sensors, and neutron moisture meters to the more complex dielectric sensors such as TDR systems, TRIME system, capacitance sensors (Diviner 2000, Environscan, Delta-T PR1/6), and the CS616 water content reflectometer. In general, the first section...
Journal Article
Published: 01 February 2004
Vadose Zone Journal (2004) 3 (1): 288–299.
... and monitored after traveling through the soil column. Two infiltration experiments followed by water redistribution were performed while acoustic signals were monitored at 60-s intervals. The water content was measured with a time domain reflectometer (TDR). Travel times of the acoustic signals were converted...
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Journal Article
Published: 01 April 2016
Vadose Zone Journal (2016) 15 (4): vzj2015.09.0122.
.... The capacitance sensors included in these studies were inaccurate in the field, despite being calibrated in large soil columns using mass balance methods. Important effects of variable soil structure, small-scale variations in soil water content and bulk electrical conductivity, and temperature were shown...
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Journal Article
Published: 01 November 2003
Vadose Zone Journal (2003) 2 (4): 572–579.
... sensors with θ measurements made with a γ attenuation meter and found that the two methods agreed to within 0.05 m 3 m −3 . In another field study, Campbell et al. (2002) compared θ measurements from 10 DPHP sensors in a peat bog with θ measurements from four water content reflectometer sensors (CS615...
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Journal Article
Published: 01 March 2016
Vadose Zone Journal (2016) 15 (3): vzj2015.04.0061.
... by time domain reflectometry: Experimental evidence and hypothesis development . Water Resour. Res. 35 : 361 – 369 . doi:10.1029/1998WR900006 Wullschleger S.D. Hanson P.J. Todd D.E. . 1996 . Measuring stem water content in four deciduous hardwoods with a time domain reflectometer...
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