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Resistivity imaging and image analysis for estimating water and solute transport across the capillary fringe in laboratory experiments

Pojmark, P; Rumpf, B; Dahlin, Torleif LU ; Persson, Magnus LU and Günther, Thomas (2011) In Vatten: tidskrift för vattenvård /Journal of Water Management and research 67(3). p.193-198
Abstract
This study contains a series of laboratory experiments designed to describe the lateral movement and spatial variability of an infiltrated dye tracer across the capillary fringe of homogenous sand in an aquarium. A combination of image analysis and geoelectrical monitoring was used to track the flow paths of the dye with different hydraulic gradients and infiltration rates. Photographs were taken for image analysis to visualize the flow paths. An ABEM Terrameter LS was used to measure the resistivity data during the experiments with a combination of multiple-gradient array and cross-hole-dipole-dipole array. BERT (Boundless Electrical Resistivity Tomography) was applied to obtain three dimensional models of the resistivity distribution.... (More)
This study contains a series of laboratory experiments designed to describe the lateral movement and spatial variability of an infiltrated dye tracer across the capillary fringe of homogenous sand in an aquarium. A combination of image analysis and geoelectrical monitoring was used to track the flow paths of the dye with different hydraulic gradients and infiltration rates. Photographs were taken for image analysis to visualize the flow paths. An ABEM Terrameter LS was used to measure the resistivity data during the experiments with a combination of multiple-gradient array and cross-hole-dipole-dipole array. BERT (Boundless Electrical Resistivity Tomography) was applied to obtain three dimensional models of the resistivity distribution. The results were compared and evaluated in respect to the image analysis. The inverted models gave a clear impression of the dye tracer distribution and movement within the aquarium. All experiments revealed a strong horizontal movement across the capillary fringe. The flow characteristics of the capillary fringe turned out to be more similar to the characteristics of the saturated zone, than to the characteristics of the unsaturated zone. If the results of this laboratory study can be verified under field conditions, it clearly shows that taking measurements and samples only in the saturated zone at contaminated sites can significantly underestimate the actual extent of the contamination plume. (Less)
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author
organization
alternative title
Resistivitet mätningar och bildanalys för att uppskatta vatten och partikeltransport genom den kapillära zonen i laboratorieexperiment
publishing date
type
Contribution to journal
publication status
published
subject
keywords
capillary fringe, lateral movement, dye tracer, image analysis, geoelectrical imaging, resistivity, BERT
in
Vatten: tidskrift för vattenvård /Journal of Water Management and research
volume
67
issue
3
pages
193 - 198
publisher
Föreningen Vatten
ISSN
0042-2886
language
English
LU publication?
yes
id
ce5778a0-0478-4573-9064-2ca49c35863d
alternative location
https://www.tidskriftenvatten.se/tsv-artikel/resistivity-imaging-and-image-analysis-for-estimating-water-and-solute-transport-across-the-capillary-fringe-in-laboratory-experiments-resistivitet-matningar-och-bildanalys-for-att-uppskatta-vatten/
date added to LUP
2018-05-30 13:56:34
date last changed
2018-06-07 14:00:47
@article{ce5778a0-0478-4573-9064-2ca49c35863d,
  abstract     = {This study contains a series of laboratory experiments designed to describe the lateral movement and spatial variability of an infiltrated dye tracer across the capillary fringe of homogenous sand in an aquarium. A combination of image analysis and geoelectrical monitoring was used to track the flow paths of the dye with different hydraulic gradients and infiltration rates. Photographs were taken for image analysis to visualize the flow paths. An ABEM Terrameter LS was used to measure the resistivity data during the experiments with a combination of multiple-gradient array and cross-hole-dipole-dipole array. BERT (Boundless Electrical Resistivity Tomography) was applied to obtain three dimensional models of the resistivity distribution. The results were compared and evaluated in respect to the image analysis. The inverted models gave a clear impression of the dye tracer distribution and movement within the aquarium. All experiments revealed a strong horizontal movement across the capillary fringe. The flow characteristics of the capillary fringe turned out to be more similar to the characteristics of the saturated zone, than to the characteristics of the unsaturated zone. If the results of this laboratory study can be verified under field conditions, it clearly shows that taking measurements and samples only in the saturated zone at contaminated sites can significantly underestimate the actual extent of the contamination plume.},
  author       = {Pojmark, P and Rumpf, B and Dahlin, Torleif and Persson, Magnus and Günther, Thomas},
  issn         = {0042-2886},
  keyword      = {capillary fringe,lateral movement,dye tracer,image analysis,geoelectrical imaging,resistivity,BERT},
  language     = {eng},
  number       = {3},
  pages        = {193--198},
  publisher    = {Föreningen Vatten},
  series       = {Vatten: tidskrift för vattenvård /Journal of Water Management and research},
  title        = {Resistivity imaging and image analysis for estimating water and solute transport across the capillary fringe in laboratory experiments},
  volume       = {67},
  year         = {2011},
}