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Electrical resistivity tomography and induced polarization for mapping the subsurface of alluvial fans : A case study in Punata (Bolivia)

Gonzales, Andrés LU ; Dahlin, Torleif LU ; Barmen, Gerhard LU and Rosberg, Jan Erik LU (2016) In Geosciences (Switzerland) 6(4).
Abstract

Conceptual models of aquifer systems can be refined and complemented with geophysical data, and they can assist in understanding hydrogeological properties such as groundwater storage capacity. This research attempts to use geoelectrical methods, Electrical Resistivity Tomography and Induced Polarization parameters, for mapping the subsurface in alluvial fans and to demonstrate its applicability; the Punata alluvial fan was used as a case study. The resistivity measurements proved to be a good tool for mapping the subsurface in the fan, especially when used in combination with Induced Polarization parameters (i.e., Normalized Chargeability). The Punata alluvial fan characterization indicated that the top part of the subsurface is... (More)

Conceptual models of aquifer systems can be refined and complemented with geophysical data, and they can assist in understanding hydrogeological properties such as groundwater storage capacity. This research attempts to use geoelectrical methods, Electrical Resistivity Tomography and Induced Polarization parameters, for mapping the subsurface in alluvial fans and to demonstrate its applicability; the Punata alluvial fan was used as a case study. The resistivity measurements proved to be a good tool for mapping the subsurface in the fan, especially when used in combination with Induced Polarization parameters (i.e., Normalized Chargeability). The Punata alluvial fan characterization indicated that the top part of the subsurface is composed of boulders in a matrix of finer particles and that the grain size decreases with depth; the electrical resistivity of these deposits ranged from 200 to 1000 Ωm, while the values of normalized chargeability were lower than 0.05 mS/m. The bottom of the aquifer system consisted of a layer with high clay content, and the resistivity ranged from 10 to 100 Ωm, while the normalized chargeability is higher than 0.07 mS/m. With the integration of these results and lithological information, a refined conceptual model is proposed; this model gives a more detailed description of the local aquifer system. It can be concluded that geoelectrical methods are useful for mapping aquifer systems in alluvial fans.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Alluvial fan, Electrical resistivity tomography, Induced polarization
in
Geosciences (Switzerland)
volume
6
issue
4
publisher
MDPI AG
external identifiers
  • scopus:84997234890
DOI
10.3390/geosciences6040051
language
English
LU publication?
yes
id
9d5a06f6-a86e-4140-b54a-9732fd45a73e
date added to LUP
2016-12-09 07:41:03
date last changed
2017-06-13 14:19:19
@article{9d5a06f6-a86e-4140-b54a-9732fd45a73e,
  abstract     = {<p>Conceptual models of aquifer systems can be refined and complemented with geophysical data, and they can assist in understanding hydrogeological properties such as groundwater storage capacity. This research attempts to use geoelectrical methods, Electrical Resistivity Tomography and Induced Polarization parameters, for mapping the subsurface in alluvial fans and to demonstrate its applicability; the Punata alluvial fan was used as a case study. The resistivity measurements proved to be a good tool for mapping the subsurface in the fan, especially when used in combination with Induced Polarization parameters (i.e., Normalized Chargeability). The Punata alluvial fan characterization indicated that the top part of the subsurface is composed of boulders in a matrix of finer particles and that the grain size decreases with depth; the electrical resistivity of these deposits ranged from 200 to 1000 Ωm, while the values of normalized chargeability were lower than 0.05 mS/m. The bottom of the aquifer system consisted of a layer with high clay content, and the resistivity ranged from 10 to 100 Ωm, while the normalized chargeability is higher than 0.07 mS/m. With the integration of these results and lithological information, a refined conceptual model is proposed; this model gives a more detailed description of the local aquifer system. It can be concluded that geoelectrical methods are useful for mapping aquifer systems in alluvial fans.</p>},
  articleno    = {51},
  author       = {Gonzales, Andrés and Dahlin, Torleif and Barmen, Gerhard and Rosberg, Jan Erik},
  keyword      = {Alluvial fan,Electrical resistivity tomography,Induced polarization},
  language     = {eng},
  month        = {12},
  number       = {4},
  publisher    = {MDPI AG},
  series       = {Geosciences (Switzerland)},
  title        = {Electrical resistivity tomography and induced polarization for mapping the subsurface of alluvial fans : A case study in Punata (Bolivia)},
  url          = {http://dx.doi.org/10.3390/geosciences6040051},
  volume       = {6},
  year         = {2016},
}