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water content reflectometers

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Journal Article
Published: 01 October 2015
Vadose Zone Journal (2015) 14 (10): vzj2015.03.0039.
...Marco Lora; Matteo Camporese; Paolo Salandin Abstract In situ measurement of soil water content is of fundamental importance in vadose zone processes. While time domain reflectometry (TDR) is a universally accepted technique, having been developed since the 1980s, water content reflectometer (WCR...
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Journal Article
Published: 01 May 2006
Vadose Zone Journal (2006) 5 (2): 673–683.
...John S. McCartney; Jorge G. Zornberg Abstract Soil moisture monitoring systems involving correlations with soil dielectric content measured using WCR (water content reflectometer) probes are susceptible to lightning-induced errors during field monitoring programs. These errors must be understood...
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Journal Article
Published: 01 January 2006
Vadose Zone Journal (2006) 5 (1): 459–468.
... . Brooks , R.H. , and A.T. Corey . 1964 . Hydraulic properties of porous media . Hydrology Paper 3 . Colorado State Univ ., Fort Collins . Campbell Scientific . 2003 . CS616 and CS625 water content reflectometers instruction manual . Campbell Scientific , Logan, UT . Ekblad...
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Experimental device used for the calibration of <span class="search-highlight">water</span> <span class="search-highlight">content</span> <span class="search-highlight">reflectometer</span>...
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 <span class="search-highlight">water</span> <span class="search-highlight">content</span> <span class="search-highlight">reflectometer</span> 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 <span class="search-highlight">water</span> <span class="search-highlight">content</span> <span class="search-highlight">reflectometer</span> (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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Conceptualization of the <span class="search-highlight">water</span> <span class="search-highlight">content</span> <span class="search-highlight">reflectometer</span> 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 <span class="search-highlight">water</span> <span class="search-highlight">content</span> <span class="search-highlight">reflectometer</span> 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 .
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<span class="search-highlight">Water</span> <span class="search-highlight">content</span> <span class="search-highlight">reflectometer</span> calibration curve for the Rocky Mountain Arsena...
Published: 01 May 2006
Fig. 1. Water content reflectometer calibration curve for the Rocky Mountain Arsenal soils.
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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Time series of (a) irrigation rate, (b) volumetric <span class="search-highlight">water</span> <span class="search-highlight">content</span>, (c) outpu...
Published: 01 October 2015
Fig. 4. Time series of (a) irrigation rate, (b) volumetric water content, (c) output signal t from the WCRs, and (d) water pressure head from the tensiometers for porosity n 2 = 0.506. WCR, water content reflectometer.
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Time series of (a) irrigation rate, (b) volumetric <span class="search-highlight">water</span> <span class="search-highlight">content</span>, (c) outpu...
Published: 01 October 2015
Fig. 3. Time series of (a) irrigation rate, (b) volumetric water content, (c) output signal t from the WCRs, and (d) water pressure head from the tensiometers for porosity n 1 = 0.585. WCR, water content reflectometer.
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Time series of (a) irrigation rate, (b) volumetric <span class="search-highlight">water</span> <span class="search-highlight">content</span>, (c) outpu...
Published: 01 October 2015
Fig. 5. Time series of (a) irrigation rate, (b) volumetric water content, (c) output signal t from the WCRs, and (d) water pressure head from the tensiometers for porosity n 3 = 0.464. WCR, water content reflectometer.
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Experimental device used for additional tests, limited to two soil moisture...
Published: 01 October 2015
Fig. 2. Experimental device used for additional tests, limited to two soil moisture values (initial and saturated). WCR, water content reflectometer.
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Recorded rainfall and <span class="search-highlight">water</span> <span class="search-highlight">content</span> fluctuations (m 3  m −3 ) at different ...
Published: 01 May 2011
Fig. 4. Recorded rainfall and water content fluctuations (m 3 m −3 ) at different depths in the no-till (NT) plot during the growing seasons of 2005 and 2006. Water content reflectometer depths are given in the legends; DOY is Day of Year.
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Recorded rainfall and <span class="search-highlight">water</span> <span class="search-highlight">content</span> fluctuations (m 3  m −3 ) at different ...
Published: 01 May 2011
Fig. 3. Recorded rainfall and water content fluctuations (m 3 m −3 ) at different depths in the conventional tillage (CT) plot during the growing seasons of 2005 and 2006. Water content reflectometer depths are given in the legends; DOY is Day of Year.
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Comparison of <span class="search-highlight">water</span> <span class="search-highlight">content</span> data collected from dual-probe heat-pulse senso...
Published: 01 February 2008
F ig . 6. Comparison of water content data collected from dual-probe heat-pulse sensors (Probes 2179 and 2215) in (A) April and (B) August 2006 vs. data collected using water content reflectometers (616) at both field plots.
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Image showing dual-probe heat-pulse (DPHP) sensor locations at Plots (A) CW...
Published: 01 February 2008
F ig . 1. Image showing dual-probe heat-pulse (DPHP) sensor locations at Plots (A) CW1 and (B) CW4. Solid circles are DPHP sensors; white boxes are 107 thermistor probes installed at 0-cm depth; triangles are water content reflectometers; hatched boxes are locations of multiplexers
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Experimental data from the tests conducted with the devices shown in  Fig. ...
Published: 01 October 2015
with the calibration curve provided by the manufacturer of the water content reflectometer sensors ( Campbell and Anderson, 1998 ; Campbell Scientific, 2003 ; Hansson and Lundin, 2006 ; Kelleners et al., 2005 ).