oa The evaluation of reliability of hydraulic conductivity and specific storage structures estimated by self -potential inversion

The objective of this study is the evaluation of reliability of estimated hydraulic conductivity and specific storage structure from self-potential (SP) data under two difficult conditions. As one of difficult condition, the lack of flux data is assumed. This situation is assumed because the sampling rate of flux data would become lower than the SP data when the monitoring data is focused on. The effect of metal casing pipe is evaluated as the other difficult condition case. Our numerical tests show that only the estimation result of hydraulic conductivity structure can be reliable when the sampling rate of the flux data is too low. It is also demonstrated that the metal casing changes the value of estimation results of hydraulic conductivity and specific storage around the casing pipe. We also demonstrate that the effect of metal casing pipe can be removed by the inversion scheme proposed in this study.