Combined Optimization of Measurement Configurations and Electrode Placement for Electrical Resistivity Tomography Survey
S.S. Uhlemann, P.B. Wilkinson, H. Maurer, F.M. Wagner and J.E. Chambers
Event name: 23rd European Meeting of Environmental and Engineering Geophysics
Session: Geoelectrics and Electromagnetics - Instrumentation, Theory and Applications II
Publication date: 03 September 2017
Info: Extended abstract, PDF ( 3.19Mb )
Price: € 20
Recent developments in geoelectrical instrumentation, data analysis, and interpretation allow for studies of higher spatial and temporal resolution than previously possible. Next to technical advances, this was also achieved by using optimized survey design for ERT measurements. So far, this has been limited to either optimizing measurement combinations or electrode locations. Here, we combine the two approaches by extending a cost function to not only optimize for increasing the resolution in a target region, but also to limit the number of electrodes. The performance is shown for a 2D and 3D example, highlighting that the introduced approach is able to image target features with similar accuracy than standard surveys, but employing only a fraction of the possible electrode locations. By achieving a resolution similar, or even superior, than standard arrays, but employing significantly fewer electrodes, the presented approach could reduce the cost of ERT monitoring as less cables and electrodes are required. It will also aid in appropriately placing electrodes in complex and critical imaging environments, e.g., monitoring the stability of natural slopes and engineered earthworks.