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

Ulusoy, İnan; Dahlin, Torleif; Bergman, Bo

Time-lapse electrical resistivity tomography of a water infiltration test on Johannishus Esker, Sweden | Tomographie de résistivité electrique en mode de suivi temporel, d’un test d’infiltration d’eau sur l’Esker de Johannishus, Suède La tomografía de la resistividad eléctrica a intervalos temporales en una prueba de infiltración en Johannishus Esker, Suecia 瑞典Johannishus蛇形丘水入渗实验延时电阻率断层摄影术 Tomografia acelerada de resistividade elétrica de um ensaio de infiltração de água em Johannishus Esker, Suécia Johannishus Eskeri üzerindeki süzülme deneyinin zamana bağlı elektrik rezistivite tomografisi, İsveç

2015

Ulusoy, İnan | Dahlin, Torleif | Bergman, Bo

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 paleo-valley. 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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