Improving the galvanic contact resistance for geoelectrical measurements in debris areas: A case study

This paper aims to test, in a quantitative way, the different approaches that can be applied improve contact resistance problem debris environment for acquisition of electrical resistivity tomography. We collected various datasets on same investigation line blocky ground surface landslide deposit, using coupling systems: single electrodes placed between boulders, adding extra parallel and drilled inside blocks. performed measurements natural dry conditions, then we added salt water nearby hammered among boulders filled holes with conductive carbomer-based gel. The results clearly demonstrate significantly reduces resistances, but also that, if is not available, collect good quality dataset conditions by connecting more parallel. Drilling directly decreases data but, necessary, use commercial carbon polymer gel provide marked improvement resistances.