Numerical analysis of In-situ flow tests for locally variable hydraulic property on a borehole

If deposition holes for high-level wastes in the deep geological disposal are damaged by excavation of the holes, flow and transport resistance at the near field can be degraded. In this study, numerical analysis for in-situ flow with a double chamber (dipole) structure in single borehole was conducted. To investigate an effect of locally variable hydraulic conductivity on groundwater flow, numerical simulations were performed. The simulation results show that anisotropic distribution of hydraulic conductivity and locally variable hydraulic conductivity have much influence on groundwater flow path and travel time. These results and analysis can be helpful to design in-situ field test of dipole tracer test, which may shows directly an effect of short-cut transport via local damaged zone