SEGJ Technical Conference

Resistivity Monitoring by Three Dimensional Analyses of Two Dimensional Resistivity Survey in Ground Water Recharge Test

Abstract Resistivity monitoring of a groundwater recharge test in a pyroclastic flow plateau was conducted to examine a method for understanding groundwater flow. The three-dimensional (3-D) distributions of resistivity change ratio were obtained from 3-D constrained non-linear differential tomography of apparent resistivity data. Electrical resistivity was largely controlled by variations in water saturation in a vadose zone. Resistivity change ratios of 3-D analyses gave more accurate estimation in volume change of water content than the 2-D analyses. The volume of low-resistivity zone well agreed with the total amount of recharged water and reflected the recharge test of not uniform. These results indicated the possibility of understanding more detailed ground water flow by 3-D analyses.