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Delimiting a saline water zone in Quaternary fluvial–alluvial deposits using transient electromagnetic : a case study in Punata, Bolivia

Gonzales Amaya, Andres LU ; Mårdh, Joakim and Dahlin, Torleif LU (2018) In Environmental Earth Sciences 77(2).
Abstract

The semiarid Punata alluvial fan is located in the central part of Bolivia. The main activity of this region is the extensive agriculture, and groundwater is the main water supply. Local villagers who use groundwater reported that in some places groundwater has a salty taste. In order to investigate the origin of this problem, several TEM soundings were performed in the study area, and they were complemented with ERT surveys. The results show top layers with resistivity values ranging from 30 to 200 Ωm and a bottom layer with resistivity values ranging from 1 to 20 Ωm, which might be interpreted as the main aquifer and a layer with high clay content, respectively. Between the top and bottom layer, a transition zone with saline water has... (More)

The semiarid Punata alluvial fan is located in the central part of Bolivia. The main activity of this region is the extensive agriculture, and groundwater is the main water supply. Local villagers who use groundwater reported that in some places groundwater has a salty taste. In order to investigate the origin of this problem, several TEM soundings were performed in the study area, and they were complemented with ERT surveys. The results show top layers with resistivity values ranging from 30 to 200 Ωm and a bottom layer with resistivity values ranging from 1 to 20 Ωm, which might be interpreted as the main aquifer and a layer with high clay content, respectively. Between the top and bottom layer, a transition zone with saline water has been identified, with resistivity values ranging from 0.1 to 1 Ωm. The origin of this closed-basin brine might be a product of the evaporation of paleolakes during the lower Pliocene, where saline clays were deposited. This study demonstrated the effectiveness of TEM sounding for mapping very low resistivity zones such as saline water.

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organization
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type
Contribution to journal
publication status
published
subject
keywords
Geophysics, Groundwater characterization, Saline water, Transient electromagnetic
in
Environmental Earth Sciences
volume
77
issue
2
publisher
Springer
external identifiers
  • scopus:85040717072
ISSN
1866-6280
DOI
language
English
LU publication?
yes
id
09313e8e-1357-490f-a474-8391f8d5865b
date added to LUP
2018-01-30 13:51:43
date last changed
2018-05-29 11:12:09
@article{09313e8e-1357-490f-a474-8391f8d5865b,
  abstract     = {<p>The semiarid Punata alluvial fan is located in the central part of Bolivia. The main activity of this region is the extensive agriculture, and groundwater is the main water supply. Local villagers who use groundwater reported that in some places groundwater has a salty taste. In order to investigate the origin of this problem, several TEM soundings were performed in the study area, and they were complemented with ERT surveys. The results show top layers with resistivity values ranging from 30 to 200 Ωm and a bottom layer with resistivity values ranging from 1 to 20 Ωm, which might be interpreted as the main aquifer and a layer with high clay content, respectively. Between the top and bottom layer, a transition zone with saline water has been identified, with resistivity values ranging from 0.1 to 1 Ωm. The origin of this closed-basin brine might be a product of the evaporation of paleolakes during the lower Pliocene, where saline clays were deposited. This study demonstrated the effectiveness of TEM sounding for mapping very low resistivity zones such as saline water.</p>},
  articleno    = {46},
  author       = {Gonzales Amaya, Andres and Mårdh, Joakim and Dahlin, Torleif},
  issn         = {1866-6280},
  keyword      = {Geophysics,Groundwater characterization,Saline water,Transient electromagnetic},
  language     = {eng},
  month        = {01},
  number       = {2},
  publisher    = {Springer},
  series       = {Environmental Earth Sciences},
  title        = {Delimiting a saline water zone in Quaternary fluvial–alluvial deposits using transient electromagnetic : a case study in Punata, Bolivia},
  url          = {http://dx.doi.org/},
  volume       = {77},
  year         = {2018},
}