Multidisciplinary verification of regional scale groundwater flow model in sedimentary rocks

Ito, Kazumasa*; Haginuma, Masashi*; Uchida, Masahiro*; Seki, Yoji*; Takeno, Naoto*; Munakata, Masahiro 

Authors developed the regional geological model based on the existing data observed in the Horonobe Underground Research Center and the three-dimensional groundwater flow model taking account of spatial distribution of permeability and hydrological environment. And then, particle tracking analysis and wash-out analysis of salinity was performed. As the results, simulation results of groundwater flow explain the observed pressure data of groundwater as reasonable. It was founded that the independency between deep groundwater flow and shallow groundwater flow, the long residence time of deep groundwater, upward flow from deep stratum and the mixture of rainwater, seawater and other water estimated by the distribution of water quality and isotope data.