Calibration of groundwater flow model based on the shape of saline water/freshwater interface in inland area

Yamamoto, Hajime*; Shimo, Michito*; Kunimaru, Takanori

In this study, the time evolution of saline water/freshwater interface during the infiltration of fresh water from the land surface into deepsaline water was simulated for 200ka in a 8km 5km area centered on the Horonobe URL site. The permeabilities of some geologic formations in the groundwater flow model were optimized based on the depths of each water/freshwater interface observed in 10 deep boreholes. The simulation well reproduced the shape of saline water/freshwater interface observed in these deep boreholes and an electrical resistivity by MT/AMT.