Time-lapse electrical resistivity tomography of a water infiltration test on Johannishus Esker, Sweden

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Abstract

Managed aquifer recharge (MAR) is an efficient way to remove organic matter from raw water and, at the same time, reduce temperature variation. Two MAR sites were constructed by Karlskrona municipality on Johannishus Esker in Sweden. One of these sites, Vång, was monitored for electrical conductivity and electrical resistivity (using electrical resistivity tomography - ERT) during a 9-week tracer
infiltration test. The aim of the monitoring was to map the pathways of the infiltrated water, with the overall goal to increase the efficiency of the MAR. ERT proved useful in determining both the nature of the esker formation and the water migration pathways. In Vång, the esker ridge follows a tectonically controlled paleovalley.
The fault/fracture zone in the bedrock along this paleo-valley was mapped. During the tracer test, the infiltrated water was detected in the area close to the infiltration ponds, whereas far-situated observation wells were less affected. For sequential infiltration and
recharge periods in MAR, the timing of the well pumping is another important factor. Natural groundwater flow direction was a determinant in the infiltration process, as expected. ERT measurements provide supplementary data for site selection, for monitoring the functionality of the MAR sites, and for revealing
the geological, hydrogeological and structural characteristics
of the site.

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Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Geotechnical Engineering

Keywords

  • Artificial recharge . Groundwater management . Sweden . Conductivity . Resistivity change
Original languageEnglish
Pages (from-to)551-566
JournalHydrogeology Journal
Volume23
Issue number3
Publication statusPublished - 2015
Publication categoryResearch
Peer-reviewedYes

Bibliographic note

Online 24 Dec 2014

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