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Calibration of temperature effect on dielectric probes using time series field data

Tadaomi Saito, Haruyuki Fujimaki, Hiroshi Yasuda, Koji Inosako and Mitsuhiro Inoue
Calibration of temperature effect on dielectric probes using time series field data (in Soil water sensors and measurement technologies, Ali Fares (prefacer), Marouane Temimi (prefacer), Kelly Morgan (prefacer) and Thijs J. Kelleners (prefacer))
Vadose Zone Journal (May 2013) 12 (2)

Abstract

Dielectric sensors have been widely used for nondestructive determination of volumetric soil water content (theta ). Since the output of such sensors is influenced by soil temperature (T), the calibration for the dependence is indispensable for accurate determination of {theta }. The objectives of this study were (i) to apply an existing empirical temperature calibration method for capacitance probes to other types of commercial dielectric probes and (ii) to propose a new calibration method using time series of field data that requires no laboratory experiments for temperature calibration. Laboratory experiments were performed to obtain probe outputs at various T (5- 35 degrees C) and theta (air dry-near saturation), using two soils and seven probes. From the results, a calibration equation describing the probe output as a function of theta and T was derived for every soil-probe combination and confirmed that this method is applicable not only to capacitance probes but also to impedance and TDR probes. Time series of field data (theta and T) had been previously monitored with ECH (sub 2) O EC-5 and EC-20 capacitance probes in the Loess Plateau, China. Hourly outputs from the probes and T at the 5-cm depth were analyzed, and calibration equations were derived using the responses of the probe outputs to daily fluctuation of T. The derived calibration equations from the field data were in good agreement with those from laboratory experiment for both probes. The equation was applied to field data and validly removed the effect of T on the probe output.


ISSN: 1539-1663
Serial Title: Vadose Zone Journal
Serial Volume: 12
Serial Issue: 2
Title: Calibration of temperature effect on dielectric probes using time series field data
Title: Soil water sensors and measurement technologies
Author(s): Saito, TadaomiFujimaki, HaruyukiYasuda, HiroshiInosako, KojiInoue, Mitsuhiro
Author(s): Fares, Aliprefacer
Author(s): Temimi, Marouaneprefacer
Author(s): Morgan, Kellyprefacer
Author(s): Kelleners, Thijs J.prefacer
Affiliation: Tottori University, Koyama-Minami, Japan
Affiliation: University of Hawaii at Manoa, Natural Resources and Environmental Management Department, Honolulu, HI, United States
Published: 201305
Text Language: English
Publisher: Soil Science Society of America, Madison, WI, United States
Number of pages: 6
References: 20
Accession Number: 2013-052065
Categories: SoilsApplied geophysics
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus.
Source Medium: WWW
N30°00'00" - N45°00'00", E129°00'00" - E147°00'00"
N34°00'00" - N39°40'00", E106°30'00" - E111°15'00"
N31°40'00" - N39°30'00", E106°00'00" - E111°19'60"
Secondary Affiliation: City College of New York, USA, United StatesUniversity of Florida, Immokalee, USA, United StatesUniversity of Wyoming, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, Copyright, Soil Science Society of America. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201332
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