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Report No.
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Study of estimation of hydrogeological structures based on fluctuation of groundwater pressure at Horonobe area, Hokkaido, northern Japan

Yokota, Hideharu; Tomura, Goji; Maekawa, Keisuke  

Japan Atomic Energy Agency has been carrying out Horonobe Underground Research Laboratory Project for understanding of characteristics of the geological environment as a part of research and development programs on geological disposal of high-level radioactive waste. As developing techniques for long-term monitoring of geological environment, we have been measuring the groundwater pressure using boreholes in order to monitor any influences due to the construction of the underground facilities. The results from examination of relations with the data of the long-term monitoring of groundwater pressure, geological characteristics obtained from the drilling cores, logging data and hydraulic characteristics of the boreholes suggest the existing of the continuative hydrogeological structure at the neighborhood of a feature geological boundary, and that the distribution of continuative hydrogeological structures around the underground facilities depends on the geological characteristics not the depth from ground level.

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