Advanced

A profiling TDR probe for water content and electrical conductivity measurements of soils

Persson, Magnus LU and Dahlin, Torleif LU (2010) In European Journal of Soil Science 61(6). p.1106-1112
Abstract
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... (More)
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. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
European Journal of Soil Science
volume
61
issue
6
pages
1106 - 1112
publisher
Wiley-Blackwell
external identifiers
  • wos:000284322200026
  • scopus:78649542637
ISSN
1365-2389
DOI
10.1111/j.1365-2389.2010.01306.x
language
English
LU publication?
yes
id
9bb0d2f8-250d-4a3d-b885-7a5d9c1960d9 (old id 1752214)
date added to LUP
2010-12-29 18:00:42
date last changed
2018-05-29 09:26:17
@article{9bb0d2f8-250d-4a3d-b885-7a5d9c1960d9,
  abstract     = {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.},
  author       = {Persson, Magnus and Dahlin, Torleif},
  issn         = {1365-2389},
  language     = {eng},
  number       = {6},
  pages        = {1106--1112},
  publisher    = {Wiley-Blackwell},
  series       = {European Journal of Soil Science},
  title        = {A profiling TDR probe for water content and electrical conductivity measurements of soils},
  url          = {http://dx.doi.org/10.1111/j.1365-2389.2010.01306.x},
  volume       = {61},
  year         = {2010},
}