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Solute transport and water content measurements in clay soils using time domain reflectometry

Persson, Magnus LU ; Berndtsson, Ronny LU ; Nasri, Slah LU ; Albergel, J; Zante, P and Yumegaki, Yuki (2000) In Hydrological Sciences Journal 45(6). p.833-847
Abstract
Clayey and saline soils have been shown to be problematic for time domain reflectometry (TDR) measurements. This study presents some of these problems and discusses solutions to them. Thirteen solute transport experiments were carried out in three undisturbed soil columns of swelling clay soil from Tunisia, labelled S1, S2, and S3 respectively. The columns were collected at three different physiographical regions within a catchment. Water fluxes ranged from 1.2 to 7.2 cm day(-1). The large solute transport heterogeneity and large tailing indicated that preferential flow was most pronounced in SI. The preferential flow took place in voids between structural elements and in wormholes. In S3, preferential flow was also evident, but not to the... (More)
Clayey and saline soils have been shown to be problematic for time domain reflectometry (TDR) measurements. This study presents some of these problems and discusses solutions to them. Thirteen solute transport experiments were carried out in three undisturbed soil columns of swelling clay soil from Tunisia, labelled S1, S2, and S3 respectively. The columns were collected at three different physiographical regions within a catchment. Water fluxes ranged from 1.2 to 7.2 cm day(-1). The large solute transport heterogeneity and large tailing indicated that preferential flow was most pronounced in SI. The preferential flow took place in voids between structural elements and in wormholes. In S3, preferential flow was also evident, but not to the same extent as in S1. In S2, the solute transport was more uniform with little preferential flow. The heterogeneity of the solute transport increased with the water flux in S1 and to a smaller extent in S3, whereas it remained constant in S2. In a previous dye experiment in the field, preferential flow in cracks was observed at those sites where SI and S3 were collected. In the column experiments, preferential flow in these cracks was less due to the higher initial water content compared to the dye experiments, indicating that the desiccation cracks were closed by the swelling clay. (Less)
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author
organization
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Contribution to journal
publication status
published
subject
keywords
unsaturated zone, solute transport, HYDRUS, hysteresis, rainfall dynamics, climate change
in
Hydrological Sciences Journal
volume
45
issue
6
pages
833 - 847
publisher
IAHS Press
external identifiers
  • scopus:0034535582
  • wos:000165704700003
ISSN
0262-6667
DOI
10.1080/02626660009492387
language
English
LU publication?
yes
id
e5ddf9fc-d58d-4e60-9162-b53b0a42b459
date added to LUP
2018-05-30 14:08:38
date last changed
2018-10-03 11:34:49
@article{e5ddf9fc-d58d-4e60-9162-b53b0a42b459,
  abstract     = {Clayey and saline soils have been shown to be problematic for time domain reflectometry (TDR) measurements. This study presents some of these problems and discusses solutions to them. Thirteen solute transport experiments were carried out in three undisturbed soil columns of swelling clay soil from Tunisia, labelled S1, S2, and S3 respectively. The columns were collected at three different physiographical regions within a catchment. Water fluxes ranged from 1.2 to 7.2 cm day(-1). The large solute transport heterogeneity and large tailing indicated that preferential flow was most pronounced in SI. The preferential flow took place in voids between structural elements and in wormholes. In S3, preferential flow was also evident, but not to the same extent as in S1. In S2, the solute transport was more uniform with little preferential flow. The heterogeneity of the solute transport increased with the water flux in S1 and to a smaller extent in S3, whereas it remained constant in S2. In a previous dye experiment in the field, preferential flow in cracks was observed at those sites where SI and S3 were collected. In the column experiments, preferential flow in these cracks was less due to the higher initial water content compared to the dye experiments, indicating that the desiccation cracks were closed by the swelling clay.},
  author       = {Persson, Magnus and Berndtsson, Ronny and Nasri, Slah and Albergel, J and Zante, P and Yumegaki, Yuki},
  issn         = {0262-6667},
  keyword      = {unsaturated zone,solute transport,HYDRUS,hysteresis,rainfall dynamics,climate change},
  language     = {eng},
  number       = {6},
  pages        = {833--847},
  publisher    = {IAHS Press},
  series       = {Hydrological Sciences Journal},
  title        = {Solute transport and water content measurements in clay soils using time domain reflectometry},
  url          = {http://dx.doi.org/10.1080/02626660009492387},
  volume       = {45},
  year         = {2000},
}