Self‐potential signals associated with pumping tests experiments

摘要: [1] The flow of groundwater during a pumping test experiment is responsible for measurable electrical field at the ground surface owing to electrokinetic coupling between Darcy velocity and current density. This can be measured passively with network nonpolarizable electrodes connected digital multichannel multimeter high internal impedance (>10 Mohm). These so-called self-potential signals used track pattern in subsurface. A was performed using set 53 Pb/PbCl2 plus an additional electrode as unique reference five piezometers monitor position piezometric surface. Using appropriate Green's functions, response analyzed terms head distribution. new methodology, which we call “electrography,” allows visualization preferential fluid pathways distribution heads experiments. conditioning technique, this method could allow inversion hydraulic conductivity around well.