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幌延沿岸域を対象とした地下水流動評価のためのモデル化・解析(受託研究)

A Modeling and numerical simulation for evaluating groundwater flow at the Horonobe coastal area (Contract research)

前川 恵輔; 三枝 博光; 稲葉 薫*; 下河内 隆文*

Maekawa, Keisuke; Saegusa, Hiromitsu; Inaba, Kaoru*; Shimogochi, Takafumi*

高レベル放射性廃棄物等の地層処分システムの設計・安全評価を行ううえで重要な地質環境の調査評価技術のうち、沿岸域を対象とした地下水流動を評価するための手法については、これまでに調査事例が限られており、調査評価手法に関する知見の充実が求められている。本件では、深地層の研究施設計画等の成果に基づき、幌延地域の沿岸域を事例とした地下水流動評価のためのモデル化・解析に関して、以下の各項目を通じて、取得される知見,ノウハウを知識ベースとして蓄積・整理した。(1)深地層の研究施設計画における地下水流動評価の作業フローの、沿岸域を含めた場合の適用性の検討、及び必要に応じた拡張・更新,(2)幌延地域の沿岸域における既存の調査試験結果に基づく地下水流動の把握,(2-1)地下水中の塩分濃度分布の推定,(2-2)モデル化・解析作業におけるノウハウ・判断根拠等の情報の抽出・整理。本件によって、我が国の多様な地質環境への対応を想定した地層処分システムの設計・安全評価を行ううえで必要となる地下水流動評価手法に関する知見の拡充を行った。

In the design and safety assessment of the geological disposal system of the high-level radioactive waste (HLW), it is extremely important to improve the reliability of the evaluation of the investigation of the geological environment, which provides technical basis. Especially, the knowhow and the experience of groundwater flow modeling based on the data acquired in deep underground at the coastal area are needed to be enhanced because these are little. Against this background, we have carried out modeling and groundwater flow simulation of the Horonobe coastal area. The knowledge and the knowhow acquired through this work were accumulated and arranged as a knowledge base by executing the following items. (1)The discussion of applicability of the workflow of evaluation of the groundwater flow for the coast region, and extension and update according to need. (2)Understand of groundwater flow based on existing investigation result in Horonobe coastal area, (2-1)Estimation of distribution of salinity in groundwater, (2-2)Extraction and arrangement of knowhow and judgment basis in modeling and simulation works. As a result, the knowledge was expanded concerning the groundwater flow evaluation methodology needed in design and safety assessment of the geological disposal system that is able to correspond to various geological environments in our country.

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