Study on validation method for regional groundwater flow model. Case study for Boso Peninsula

In the safety assessment for a geological disposal of radioactive waste, it is important to establish validation methods for regional groundwater flow system more than 300m at depth to estimate radionuclide migration to human environment through groundwater flow system. The study discussed application of data and assessment methods for model validation based on multiple indicators such as hydrology, groundwater chemistry, temperature and age of groundwater in case of the Boso Peninsula in Chiba Prefecture where a lot of in-situ data about groundwater were measured. This results show that existing hydrochemical and thermal data are applicable to validate freshwater and saltwater distribution and groundwater flow pattern in case of regional scale of whole Boso Peninsla. It also demonstrates that multiple indicators such as hydrology, groundwater chemistry, temperature and age of groundwater are applicable to validate the groundwater flow property and groundwater flow boundary in case of site scale coastal region of Boso Peninsula. (author)