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Elucidation of submarine sedimentation process and formation process of local high-concentration state for radionuclide released to the ocean

Research Project

Project/Area Number 16K00580
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Environmental impact assessment
Research InstitutionNational Institute of Maritime, Port and Aviation Technology

Principal Investigator

Mitsufumi ASAMI  国立研究開発法人海上・港湾・航空技術研究所, その他部局等, 研究員 (80446591)

Co-Investigator(Kenkyū-buntansha) 岡 秀行  国立研究開発法人海上・港湾・航空技術研究所, その他部局等, 研究員 (80399518)
Project Period (FY) 2016-10-21 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2018: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2017: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Fiscal Year 2016: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Keywords海底堆積物の広域・局所的変動 / 放射性核種海洋移行 / 質量保存流速場モデル / 海底堆積物 / 狭域海流場 / 遠方後流領域 / 放射性核種海洋移行モデル / 海洋モデル / 開境界条件 / 海底地形 / 海面-大気相互作用 / 放射性核種移行モデル / ダウンスケール / 海洋堆積物 / MASCON
Outline of Final Research Achievements

The Fukushima Dai-ichi Nuclear Power Plant accident in 2011 resulted in the release of enormous quantities of radionuclides, especially radioactive cesium, into the ocean. The radionuclides which have accumulated in sea sediment have been formed vertical concentration distribution in seabed sediment. In the present study, movements of suspended particle material and radionuclides transport on the Fukushima coastal area was evaluated for understanding distribution patterns of radionuclides in seabed sediment. Furthermore, a radionuclides dispersion model was constructed to reproduce the concentration distribution of radionuclides inside the sediment.

Academic Significance and Societal Importance of the Research Achievements

放射性核種の海底堆積物に沈着した濃度分布を形成する主要因が明らかになることで、放射性核種吸着後の海底堆積物の濃度の経時変化が把握できるようになる。その結果、従来大規模かつコストのかかる海域モニタリングが実施されていたが、本研究で開発した手法を利用することにより、放射性核種放出によってもたらされる漁業等に与える環境影響を評価するために有益な情報を提供することが容易になる。

Report

(5 results)
  • 2019 Annual Research Report   Final Research Report ( PDF )
  • 2018 Research-status Report
  • 2017 Research-status Report
  • 2016 Research-status Report
  • Research Products

    (3 results)

All 2019 2018 2017

All Journal Article (1 results) (of which Peer Reviewed: 1 results,  Open Access: 1 results) Presentation (2 results) (of which Int'l Joint Research: 2 results)

  • [Journal Article] 海底堆積物の広域および局所的変動調査2018

    • Author(s)
      浅見光史
    • Journal Title

      海上技術安全研究所報告

      Volume: 18(2) Pages: 49-65

    • Related Report
      2018 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] Temporal Changes in Radioactive Cs Concentration in Sea Sediment off East Japan, after the Fukushima Dai-ichi Nuclear Accident2019

    • Author(s)
      Mitsufumi ASAMI, So KAMADA, Seiki OHNISHI, Blair THORNTON, Tamaki URA
    • Organizer
      Underwater Technology 2019
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] Modelling Dispersion Processes of Radioactive Materials between Dissolved Phase, Suspended Matter Phase, and Bottom Sediment Phase including Model of Spatially Distribution of Radioactive Materials in Sediments on the Seafloor2017

    • Author(s)
      浅見光史、岡秀行、小田野直光
    • Organizer
      18th International Symposium on the Packaging and Transportation of Radioactive Materials
    • Place of Presentation
      神戸ポートピアホテル
    • Related Report
      2016 Research-status Report
    • Int'l Joint Research

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Published: 2016-10-24   Modified: 2021-02-19  

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