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Sources of errors in time domain refloctometry measurements of soil moisture

Carlsson, Magnus (1998). Sources of errors in time domain refloctometry measurements of soil moisture. ["eprint_fieldopt_monograph_type_und_thesis" not defined]. Uppsala: (NL, NJ) > Dept. of Soil Sciences > Div. of Hydrotechnics, Sveriges lantbruksuniversitet. Avdelningsmeddelande / Sveriges lantbruksuniversitet, Institutionen för markvetenskap, Avdelningen för lantbrukets hydroteknik ; 98:5
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Abstract

In the monitoring of soil water Time-Domain Reflectometry (TDR) has gained widespread use. TDR has proved to be useful both in determination of soil water content and soil bulk electrical conductivity. These measurements are, however, complex and there are many sources of errors to consider. The purpose of this investigation is therefore to identify errors, the causes of these errors and to suggest improvements. This was achieved by a literature study as well as by two experiments, one conducted in the field and one conducted in the laboratory. Four TDR-systems were tested. The results show that errors can be classified in two groups, errors which is influencing the determination of the dielectric constant, Ka, and errors affecting the conversion of Ka to volumetric water content, θν. The former type can be further divided into errors which concern the quality of the trace and errors influencing the evaluation of the trace. Unbalanced probes and long cables were identified as contributing to uncertainties. Errors from conversion of Ka to θν were considered when the systems were calibrated. One of the programs tested allows convenient one point calibration with a trace offset parameter. The advantage of re-evaluation of measurements with individual settings also permits increased accuracy of measurements.

Authors/Creators:Carlsson, Magnus
Title:Sources of errors in time domain refloctometry measurements of soil moisture
Series/Journal:Avdelningsmeddelande / Sveriges lantbruksuniversitet, Institutionen för markvetenskap, Avdelningen för lantbrukets hydroteknik (0282-6569)
Year of publishing :1998
Number:98:5
Number of Pages:49
Place of Publication:Uppsala
Publisher:Institutionen för markvetenskap, avdelningen för lantbrukets hydroteknik
ISSN:0282-6569
Language:English
Publication Type:Report
Refereed:No
Full Text Status:Public
Subjects:Obsolete subject words > FORESTRY, AGRICULTURAL SCIENCES and LANDSCAPE PLANNING > Soil science
Obsolete subject words > INTERDISCIPLINARY RESEARCH AREAS > Water in nature and society
Keywords:TDR, soil water, soil moisture
URN:NBN:urn:nbn:se:slu:epsilon-8-543
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-8-543
ID Code:4888
Department:(NL, NJ) > Dept. of Soil Sciences > Div. of Hydrotechnics
Deposited By: Elisabeth Bölenius
Deposited On:15 Jul 2010 00:00
Metadata Last Modified:02 Dec 2014 10:34

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