Monitoring Groundwater flow with ERT
A. Van Ballaer (TU Delft - Civil Engineering & Geosciences)
E.C. Slob – Mentor (TU Delft - Applied Geophysics and Petrophysics)
Marios Karaoulis – Mentor (Deltares)
D.S. Draganov – Coach (TU Delft - Applied Geophysics and Petrophysics)
Florian Wagner – Coach (Applied Geophysics and Geothermal Energy (E.ON Energy Research Center))
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Abstract
Geophysical monitoring is a popular tool in aquifer characterization and groundwater flow. To address this objective at groundwater extraction site ‘t Klooster, an ERT dataset was analyzed to identify groundwater flow patterns resulting from the injection of warm oxygenated water. Using a petrophysical model, changes in resistivity were converted to estimated temperature changes to visualize the spread of warm oxygenated water. Multi-dimensional analysis of the resistivity response of the subsurface was carried out. This allowed for the division of the subsurface into 4 depth regimes according to their response to well activity. It is shown that wells up to 100m removed from the ERT set-up influenced the temperature distribution. Furthermore, injected oxygenated water highlighted a preferential flow path between the depths of 20 and 35m in a north-west direction. This is in line with global groundwater flow in the area. Groundwater flow effects could not be reliably separated from the effect of well activity, however its effect is recognized both during extraction of groundwater and injection of warm water.