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Averaging Performance of Capacitance and Time Domain Reflectometry Sensors in Nonuniform Wetted Sand Profiles

2014; Soil Science Society of America; Volume: 13; Issue: 12 Linguagem: Inglês

10.2136/vzj2014.03.0025

1539-1663

Erik van den Elsen, C.J. Ritsema, Manuel Seeger, Saskia Keesstra,

Seismic Waves and Analysis

Vadose Zone JournalVolume 13, Issue 12 vzj2014.03.0025 p. 1-13 Original Research Averaging Performance of Capacitance and Time Domain Reflectometry Sensors in Nonuniform Wetted Sand Profiles H.G.M. van den Elsen, Corresponding Author H.G.M. van den Elsen erik.vandenelsen@wur.nl Alterra, Wageningen Univ. and Research, Wageningen, the NetherlandsCorresponding author (erik.vandenelsen@wur.nl).Search for more papers by this authorC.J. Ritsema, C.J. Ritsema Wageningen Univ. and Research, Wageningen, the NetherlandsSearch for more papers by this authorM. Seeger, M. Seeger Dep. of Physical Geography, Univ. of Trier, Trier, GermanySearch for more papers by this authorS.D. Keesstra, S.D. Keesstra Wageningen Univ. and Research, Wageningen, the NetherlandsSearch for more papers by this author H.G.M. van den Elsen, Corresponding Author H.G.M. van den Elsen erik.vandenelsen@wur.nl Alterra, Wageningen Univ. and Research, Wageningen, the NetherlandsCorresponding author (erik.vandenelsen@wur.nl).Search for more papers by this authorC.J. Ritsema, C.J. Ritsema Wageningen Univ. and Research, Wageningen, the NetherlandsSearch for more papers by this authorM. Seeger, M. Seeger Dep. of Physical Geography, Univ. of Trier, Trier, GermanySearch for more papers by this authorS.D. Keesstra, S.D. Keesstra Wageningen Univ. and Research, Wageningen, the NetherlandsSearch for more papers by this author First published: 19 December 2014 https://doi.org/10.2136/vzj2014.03.0025Citations: 1 We present a comparison study on how well capacitance and time domain reflectometry water content sensors can estimate average water content values in non-uniformly wetted soils. This ability is important in studies where accurate average values are crucial. All rights reserved. No part of this periodical may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying, recording, or any information storage and retrieval system, without permission in writing from the publisher. Read the full textAboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinked InRedditWechat Abstract The averaging behavior of two capacitance water content sensors in nonuniform wetted sand samples was assessed and compared with the averaging behavior of a time domain reflectometry (TDR) water content sensor in identical samples. Four different nonuniform wetting situations were assessed. In one of the four experiments, the orientation of the capacitance sensor was altered, while in another the sensitivity along the length of the sensor was tested. For one of the tested sensor types, the overestimation of the volumetric water content (VWC) was 0.034 compared with the value determined by drying, while the corresponding TDR value deviated 0.009. The conclusion is that in a nonuniform wetted soil profile, the capacitance sensors tested weigh the wet parts more heavily than the dry parts, resulting in an overestimation of the average VWC. Therefore we conclude that the capacitance sensors tested are less suitable for applications in situations where both nonuniform wetted profiles are encountered and accurate VWC measurements are required. Citing Literature Volume13, Issue12December 2014Pages 1-13 RelatedInformation