Numerical Assessment of the Influence of Long-Term Topographic Change on Deep Groundwater Flow Conditions

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  • ONOE Hironori
    Crystalline Environment Research Group, Geological Isolation Research and Development Directorate, Japan Atomic Energy Agency
  • SASAO Eiji
    Research and Development Planning and Co-ordination Group, Geological Isolation Research and Development Directorate, Japan Atomic Energy Agency
  • SAEGUSA Hiromitsu
    Crystalline Environment Research Group, Geological Isolation Research and Development Directorate, Japan Atomic Energy Agency
  • KOSAKA Hiroshi
    NEWJEC Inc.

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  • 過去から現在までの長期的な地形変化が地下水流動特性に与える影響の解析的評価の試み
  • カコ カラ ゲンザイ マデノ チョウキテキナ チケイ ヘンカ ガ チカスイ リュウドウ トクセイ ニ アタエル エイキョウ ノ カイセキテキ ヒョウカ ノ ココロミ

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  It is important to understand how long-term geological phenomena such as uplift and erosion influence deep hydrogeological and hydrochemical environments, and to predict the influence of such long-term geological phenomena in the future for the geological disposal of nuclear wastes. From the viewpoint of groundwater flow, it is necessary to estimate long-term topographic changes, and to evaluate their influence on deep groundwater flow conditions. In this study, the influence of long-term topographic change on deep groundwater flow conditions was numerically assessed. The general paleotopographic features of a wide area were estimated and groundwater flow simulations were carried out around the Tono area. As a result, the effects of long-term topographic changes and hydraulic features of faults on groundwater flow conditions, such as hydraulic gradient, velocity distribution, flow paths, and lengths, were confirmed. In general, if topographic characteristics such as locations of major mountains and valleys around the site have not changed, the groundwater flow paths will not significantly change. The methodology, which is proposed in this study, used to understand groundwater flow evolutions due to long-term topographic changes is efficient for identifying detailed assessment areas and is recommended based on the results of this study.<br>

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