*2.6. Clay Layer Characterization Using Electric Method*

The data were collected using the IRIS Syscal Pro Plus multi-electrode imaging system with internal multiplexer. Three profiles were acquired using 96 stainless electrodes spaced every 30 cm. Length of the profile was 28.5 m. The measurement was carried out using Dipole–Dipole and Wenner configuration. Due to good coupling, no data was removed during pre-processing. Inversion will be carried out using Res2DINV software [28,29] with a L1 regulation norm. Root means square values was lower than 1% after fives iterations for the three profiles.
