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隆起・侵食による地形・処分場深度の変化を考慮した核種の流出点評価

An Evaluation of runoff point considering topography and repository depth changes due to uplift and erosion

坂本 道仁*; 若杉 圭一郎*; 樺沢 さつき ; 山口 正秋 

Sakamoto, Michihito*; Wakasugi, Keiichiro*; Kabasawa, Satsuki; Yamaguchi, Masaaki

長期的な隆起・侵食等の影響により地形は変遷し、処分場深度も変化する。また、地形や処分場深度が変化することで核種の移行経路や地表での流出点も変化する。本研究では隆起速度の差による地形変遷の違いに着目しながら地形変遷解析を行った。また、これらの地形変遷に基づく地下水流動解析を実施した。さらに地形変遷とそれに基づく処分場深度の変化を考慮しながら、核種の流出点の変化に着目して粒子追跡解析を行った。この結果、本研究で設定した異なる隆起速度に対して、粒子の地表付近での流出点の変化が確認された。

The topography is affected by long term uplift and erosion, which also causes change of the depth of the repository site. In addition, nuclide migration paths and outflow points on the ground surface change according to the changes in topography and the repository depth. In this study, the topographical transition analysis was performed focusing on the difference in the topographical transition due to the difference in the uplift rate, and the groundwater flow analysis was performed based on that. In addition, nuclide migration paths were evaluated considering the changes in topography and repository depth. As a result, it was indicated that the runoff points from the repository near the ground surface would change according to the uplift rate.

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