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Solute transport measurements in different soil types using time domain reflectometry

Persson, Magnus LU (2001) In Nordic Hydrology 32(2). p.99-114
Abstract
During recent years, time domain reflectometry (TDR) has proved to be a valuable tool for both water content (theta) and bulk electrical conductivity (sigma (a)) measurements. To allow resident solute concentration (C-r) measurements, a calibration procedure is necessary for the relationship between sigma (a) and C-r. Two main calibration approaches exist. Direct calibration allows for C-r measurements with varying theta, while the indirect calibration method is used for conditions with constant theta. In this paper, three methods of achieving direct calibration parameters are presented and evaluated in three different soil types. Calibrations are made in both disturbed and undisturbed soil columns as well as in the field. It was shown... (More)
During recent years, time domain reflectometry (TDR) has proved to be a valuable tool for both water content (theta) and bulk electrical conductivity (sigma (a)) measurements. To allow resident solute concentration (C-r) measurements, a calibration procedure is necessary for the relationship between sigma (a) and C-r. Two main calibration approaches exist. Direct calibration allows for C-r measurements with varying theta, while the indirect calibration method is used for conditions with constant theta. In this paper, three methods of achieving direct calibration parameters are presented and evaluated in three different soil types. Calibrations are made in both disturbed and undisturbed soil columns as well as in the field. It was shown that there were only small differences between calibration methods in homogeneous sand. In other soils, choosing the correct calibration is important. In clay soils, solute transport measurements are difficult to take under conditions with varying theta, therefore it is suggested that only the indirect calibration approach should be used. When using TDR it is important to be aware of the accuracy of the TDR system in order to interpret data correctly. Some error sources are thus also briefly discussed. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Nordic Hydrology
volume
32
issue
2
pages
99 - 114
publisher
IWA Publishing
external identifiers
  • scopus:0034911447
  • wos:000169863700003
ISSN
0029-1277
language
English
LU publication?
yes
id
4b7dd403-c70c-47ac-84f0-14ff68c0aba9
date added to LUP
2018-05-30 10:06:37
date last changed
2020-03-31 13:58:00
@article{4b7dd403-c70c-47ac-84f0-14ff68c0aba9,
  abstract     = {During recent years, time domain reflectometry (TDR) has proved to be a valuable tool for both water content (theta) and bulk electrical conductivity (sigma (a)) measurements. To allow resident solute concentration (C-r) measurements, a calibration procedure is necessary for the relationship between sigma (a) and C-r. Two main calibration approaches exist. Direct calibration allows for C-r measurements with varying theta, while the indirect calibration method is used for conditions with constant theta. In this paper, three methods of achieving direct calibration parameters are presented and evaluated in three different soil types. Calibrations are made in both disturbed and undisturbed soil columns as well as in the field. It was shown that there were only small differences between calibration methods in homogeneous sand. In other soils, choosing the correct calibration is important. In clay soils, solute transport measurements are difficult to take under conditions with varying theta, therefore it is suggested that only the indirect calibration approach should be used. When using TDR it is important to be aware of the accuracy of the TDR system in order to interpret data correctly. Some error sources are thus also briefly discussed.},
  author       = {Persson, Magnus},
  issn         = {0029-1277},
  language     = {eng},
  number       = {2},
  pages        = {99--114},
  publisher    = {IWA Publishing},
  series       = {Nordic Hydrology},
  title        = {Solute transport measurements in different soil types using time domain reflectometry},
  volume       = {32},
  year         = {2001},
}