Horonobe Underground Research Laboratory Project; Surface hydrological investigation and activities for its evaluation

Yamamoto, Yoichi; Maekawa, Keisuke  ; Yokota, Hideharu

Horonobe Underground Research Center of Japan Atomic Energy Agency has carried out investigated surface hydrological investigation in and around the Horonobe Underground Research Laboratory (URL) area as a part of Horonobe URL project. We continue meteorological observation, observation of river flux and water quality, soil moisture observation and groundwater level observation in order to understand recharge rate and groundwater flow in the shallow part, which are required for the setting of boundary and initial condition of the groundwater flow analysis. Outline of the surface hydrological investigation and some study results of groundwater flow around surface are reported.