Monitoring Groundwater flow with ERT

Title

Monitoring Groundwater flow with ERT

 Author

Van Ballaer, Alexander (TU Delft Civil Engineering & Geosciences)

Contributor

Slob, E.C. (mentor) ORCID 0000-0002-4529-1134
Karaoulis, Marios (mentor)
Draganov, D.S. (graduation committee) ORCID 0000-0001-8606-1178
Wagner, Florian (graduation committee)

Degree granting institution

Delft University of Technology

 Programme

Applied Geophysics | IDEA League

 Date

2020-08-21

 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.

 Subject

Electrical resistivity tomography
Groundwater abstraction
Groundwater flow

 To reference this document use:

http://resolver.tudelft.nl/uuid:68835460-920e-4799-8f44-39d6dbf74d36

 Part of collection

Student theses

 Document type

master thesis

 Rights

© 2020 Alexander Van Ballaer
Files
PDF Thesis_Report.pdf 1.93 MB
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