Non-invasive lab test in the monitoring of vadose zone contaminated by light non-aqueous phase liquid
B. Alesse, L. Orlando and L. Palladini
Journal name: Geophysical Prospecting
Issue: Vol 67, No 8, October 2019 pp. 2161 - 2175
Info: Article, PDF ( 8.79Mb )
We discuss a strategy capable of a quantitative long-term monitoring of water saturation and volume variation of light non-aqueous phase liquids in the soil. The goal was reached monitoring a controlled sand cell contaminated with classical gasoline over 124 days, using geophysical methods such as electrical resistivity tomography, induced polarization and ground penetrating radar. We show that empirical relations, linking the water saturation to the physical parameters measured as resistivity from electrical resistivity tomography and travel time from georadar with advanced processing, are good tools for this purpose. The consistence of the proposed process is validated by both good overlap of results carried out from electrical resistivity tomography and georadar and theoretical models simulating the actual experiment.