Study of the methodology for estimation of the influence of long-term topographic and climate change on deep groundwater flow conditions in case of Tono area, 1; Estimatation of paleo-topographic features and paleo-climate for several hundreds of thousand years and geological modeling based on field investigations

Onoe, Hironori* ; Shiomi, Tetsuya*; Kusano, Tomohiro; Yasue, Kenichi; Kosaka, Hiroshi; Saegusa, Hiromitsu; Takeuchi, Ryuji  ; Tajikara, Masayoshi*

To study the methodology for estimation of the influence of long-term topographic and climate change on deep groundwater flow condition, we estimated of paleo-topography and paleo-climate for past several hundred thousand years based on data from research and field investigations and built geological structured model that considered paleo-topography distribution in case of Gifu Tono area. As a result, we showed technique to restore paleo-topography distribution for three dimensions from fluvial terrace surface data dotted along a river in utilizing DEM data and GIS. In addition, we showed estimate method of climate of glacial epoch and quantity of cultivation of groundwater by near-surface hydrological observation data, pollen fossil analysis and expenditure calculation based on them. Furthermore, we built three-dimensional geological structured model that was base on carrying out groundwater flow analysis by utilizing bygones information.