Field calibration of ThetaProbe (ML2x) and ECHO probe (EC-20) soil water sensors in a Black Vertosol
Identifieur interne : 009580 ( Main/Exploration ); précédent : 009579; suivant : 009581Field calibration of ThetaProbe (ML2x) and ECHO probe (EC-20) soil water sensors in a Black Vertosol
Auteurs : J. L. Foley [Australie] ; E. Harris [France]Source :
- Australian journal of soil research [ 0004-9573 ] ; 2007.
Descripteurs français
- Pascal (Inist)
English descriptors
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Abstract
Past studies have shown that soil-specific calibrations are required to attain a higher level of accuracy when measuring soil water content with ThetaProbe and ECHO probe soil water sensors, particularly in swelling clay soils. Both probes were assessed for their capacity to accurately monitor soil water in a deep drainage study on a Black Vertosol. Probes were trialled in situ and calibrated against hand-sampled volumetric measurements. The generic calibrations given by the manufacturers resulted in significant errors in water content estimates for both probes. Using the generic calibration, ECHO probes under-estimated water content by 0.10-0.2 m3/m3, whereas ThetaProbes under-estimated by 0.04m3/m3 at the wet end and over-estimated by 0.08 m3/m3 at the dry end. The soil-specific calibrations significantly improved the accuracy of both probes. ThetaProbes were chosen for the drainage study. The calibration allowed for accuracy across the full wet-dry range to within 0.001-0.004 m3/m3 of volumetric measurements. ECHO probes were less accurate at the wet end, but still determined soil water content to within 0.02-0.05 m3/m3 of volumetric measurements.
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Harris</name><affiliation wicri:level="1"><inist:fA14 i1="02"><s1>Ecole Supérieure d'Agriculture de Purpan, 75, voie du T.O.E.C BP 57611</s1><s2>31076 Toulouse</s2><s3>FRA</s3><sZ>2 aut.</sZ></inist:fA14><country>France</country><wicri:noRegion>31076 Toulouse</wicri:noRegion><placeName><settlement type="city">Toulouse</settlement><region type="region" nuts="2">Occitanie (région administrative)</region><region type="old region" nuts="2">Midi-Pyrénées</region></placeName></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">INIST</idno><idno type="inist">07-0329488</idno><date when="2007">2007</date><idno type="stanalyst">PASCAL 07-0329488 INIST</idno><idno type="RBID">Pascal:07-0329488</idno><idno type="wicri:Area/PascalFrancis/Corpus">003B35</idno><idno type="wicri:Area/PascalFrancis/Curation">002553</idno><idno type="wicri:Area/PascalFrancis/Checkpoint">003893</idno><idno type="wicri:explorRef" wicri:stream="PascalFrancis" wicri:step="Checkpoint">003893</idno><idno type="wicri:doubleKey">0004-9573:2007:Foley J:field:calibration:of</idno><idno type="wicri:Area/Main/Merge">00A005</idno><idno type="wicri:Area/Main/Curation">009580</idno><idno type="wicri:Area/Main/Exploration">009580</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a">Field calibration of ThetaProbe (ML2x) and ECHO probe (EC-20) soil water sensors in a Black Vertosol</title><author><name sortKey="Foley, J L" sort="Foley, J L" uniqKey="Foley J" first="J. L." last="Foley">J. L. Foley</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Agricultural Production Systems Research Unit, Queensland Department of Natural Resources and Water, PO Box 318</s1><s2>Toowoomba, Qld 4350</s2><s3>AUS</s3><sZ>1 aut.</sZ></inist:fA14><country>Australie</country><wicri:noRegion>Toowoomba, Qld 4350</wicri:noRegion></affiliation></author><author><name sortKey="Harris, E" sort="Harris, E" uniqKey="Harris E" first="E." last="Harris">E. Harris</name><affiliation wicri:level="1"><inist:fA14 i1="02"><s1>Ecole Supérieure d'Agriculture de Purpan, 75, voie du T.O.E.C BP 57611</s1><s2>31076 Toulouse</s2><s3>FRA</s3><sZ>2 aut.</sZ></inist:fA14><country>France</country><wicri:noRegion>31076 Toulouse</wicri:noRegion><placeName><settlement type="city">Toulouse</settlement><region type="region" nuts="2">Occitanie (région administrative)</region><region type="old region" nuts="2">Midi-Pyrénées</region></placeName></affiliation></author></analytic><series><title level="j" type="main">Australian journal of soil research</title><title level="j" type="abbreviated">Aust. j. soil res.</title><idno type="ISSN">0004-9573</idno><imprint><date when="2007">2007</date></imprint></series></biblStruct></sourceDesc><seriesStmt><title level="j" type="main">Australian journal of soil research</title><title level="j" type="abbreviated">Aust. j. soil res.</title><idno type="ISSN">0004-9573</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Cracking</term><term>Dielectric method</term><term>Earth science</term><term>Probe</term><term>Reflectometry</term><term>Vertosols</term><term>calibration</term><term>electrical conductivity</term><term>expansive clays</term><term>frequency</term><term>measurement sensor</term><term>soil moisture</term><term>water content</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Etalonnage</term><term>Sonde</term><term>Conductivité électrique</term><term>Humidité sol</term><term>Capteur mesure</term><term>Fréquence</term><term>Réflectométrie</term><term>Méthode diélectrique</term><term>Teneur eau</term><term>Fissuration</term><term>Argile gonflante</term><term>Science terre</term><term>Vertosol</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Past studies have shown that soil-specific calibrations are required to attain a higher level of accuracy when measuring soil water content with ThetaProbe and ECHO probe soil water sensors, particularly in swelling clay soils. Both probes were assessed for their capacity to accurately monitor soil water in a deep drainage study on a Black Vertosol. Probes were trialled in situ and calibrated against hand-sampled volumetric measurements. The generic calibrations given by the manufacturers resulted in significant errors in water content estimates for both probes. Using the generic calibration, ECHO probes under-estimated water content by 0.10-0.2 m<sup>3</sup>/m<sup>3</sup>, whereas ThetaProbes under-estimated by 0.04m<sup>3</sup>/m<sup>3</sup> at the wet end and over-estimated by 0.08 m<sup>3</sup>/m<sup>3</sup> at the dry end. The soil-specific calibrations significantly improved the accuracy of both probes. ThetaProbes were chosen for the drainage study. The calibration allowed for accuracy across the full wet-dry range to within 0.001-0.004 m<sup>3</sup>/m<sup>3</sup> of volumetric measurements. ECHO probes were less accurate at the wet end, but still determined soil water content to within 0.02-0.05 m<sup>3</sup>/m<sup>3</sup> of volumetric measurements.</div></front></TEI><affiliations><list><country><li>Australie</li><li>France</li></country><region><li>Midi-Pyrénées</li><li>Occitanie (région administrative)</li></region><settlement><li>Toulouse</li></settlement></list><tree><country name="Australie"><noRegion><name sortKey="Foley, J L" sort="Foley, J L" uniqKey="Foley J" first="J. L." last="Foley">J. L. Foley</name></noRegion></country><country name="France"><region name="Occitanie (région administrative)"><name sortKey="Harris, E" sort="Harris, E" uniqKey="Harris E" first="E." last="Harris">E. Harris</name></region></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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