A profiling TDR probe for water content and electrical conductivity measurements of soils
Författare
Summary, in English
Measurements of water content profiles are of great interest in hydrology and soil science. Time domain reflectometry (TDR) is a well-established method for water content measurements; however, most TDR probe designs are suitable for measurements in only a small soil volume. In this article, a 1-m long TDR profiling probe with five measurement sections is described. Unlike most other previous profiling probes, our probe allows for both dielectric permittivity (e) and electrical conductivity (sa) measurements. The accuracy of the e and sa measurements was excellent; the precision of the measurements was, however, significantly poorer than with a 0.20-m long standard three rod TDR probe. The new probe was installed in a field and successfully measured water content profiles during the growing season of 2009. During an infiltration experiment it was shown that because of its geometry, the profiling probe over-estimated the wetting-front velocity. At a 0.10-m depth, the over-estimation was almost 30%. The over-estimate will be less significant at greater depths.
Publiceringsår
2010
Språk
Engelska
Sidor
1106-1112
Publikation/Tidskrift/Serie
European Journal of Soil Science
Volym
61
Issue
6
Fulltext
- Available as PDF - 790 kB
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Länkar
Dokumenttyp
Artikel i tidskrift
Förlag
Wiley-Blackwell
Ämne
- Geotechnical Engineering
- Water Engineering
Status
Published
ISBN/ISSN/Övrigt
- ISSN: 1365-2389