A STUDY ON ESTIMATION OF THE CONDITION OF THE SEEPAGE FLOW USING THE ELECTRIC CONDUCTIVITY IN THE BOREHOLE

Abstract

 Field observation of the electric conductivity in the borehole adjacent to the river was performed. Results of the field observation showed that the electoric conductivity was remarkably low at the limited 2 meter width in the borehole locally. Additionally, the measured electric conductivity showed fluctuation. Experiment for the examination of the fluctuation of the electric conductivity was performed. Results of the experiment showed that the fluctuation of the electoric conductivity was caused by inflow of 2 types of water with different electric conductivity.