Boundary delineation for regional groundwater flow through Geographic Information System (Contract research)

Yamakawa, Tadashi; Munakata, Masahiro ; Kimura, Hideo; Hyodo, Hiroshi*

Radionuclide migration toward human society through geologic processes is to be assessed as part of long-term safety assessments of geologic disposal for radioactive waste. This study was conducted to develop methodologies of boundary delineation for regional groundwater flow system. Geographic Information System, GIS, was applied to Miyakoji in the Abukuma as an area of interest. The present study revealed that, taking the groundwater flows and fracture characteristics of the area into consideration, the groundwater flow system in Miyakoji drainage basin should be bounded by the Otakine mountain area and the northern part of Tokoha drainage basin, which occupies a larger area than understood before.