Evaluation of spatial distribution of groundwater in bed rock through the intermediary of fracture

Watanabe, Yusuke  ; Fukuda, Kenji; Murakami, Hiroaki  ; Iwatsuki, Teruki  ; Suzuki, Yohei*

In this study, microbial incubation experiment was conducted at 300m depth in Mizunami underground research laboratory for the purpose of evaluating the relation between microbial activity and geochemical characteristics in underground environment. In this test, it is necessary to evaluate the microbial activity based on the change in the dissolved component concentration of the groundwater, and it is necessary to grasp the change of the dissolved component due to the exchange of the groundwater in the borehole in advance. Therefore, fluorescent tracer was added to evaluate how the groundwater during the cultivation test spreads into the surrounding rock.