Simulated time-lapse dc-IP monitoring of dense non-aqueous phase liquids (DNAPLs)-An Initial Approach

Geoelectrical techniques have long standing potential for imaging sites contaminated by dense non-aqueous phase liquids (DNAPLs). Recent work explored the effectiveness of time-lapse DC resistivity to monitor DNAPL source zone remediation. A fundamental component of the work was the development of a unique and comprehensive linkage between well-established DNAPL and DC resistivity models, with the coupled model serving as a cost-effective and valuable investigative tool. The objective of this current study is to evaluate the application of integrated time-lapse DC resistivity and induced polarization (DC-IP) for monitoring DNAPL contamination. This paper introduces the various modelling tools and presents an initial simplistic approach to extend the established DNAPL-DC resistivity modelling framework to incorporate time-lapse IP. Preliminary results are encouraging and ongoing work is focused on developing an advanced hydraulic-electric linkage between the DNAPL and DC-IP models to produce more realistic IP responses from DNAPL spills.