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Dynamical downscaling of ocean conditions south of Japan toward predicting extreme current

Research Project

Project/Area Number 18K13933
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 24020:Marine engineering-related
Research InstitutionThe University of Tokyo

Principal Investigator

Kodaira Tsubasa  東京大学, 大学院新領域創成科学研究科, 助教 (60795459)

Project Period (FY) 2018-04-01 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2019: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2018: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Keywords海洋ダウンスケーリング / 黒潮 / 潮流 / 伊豆諸島 / スペクトルナッジング / 海洋数値モデル / スペクトラル・ナッジング / 潮汐 / 日本南岸 / ダウンスケーリング / 海流 / 数値モデル / 再解析 / 海流潮流 / 台風 / 海洋構造物
Outline of Final Research Achievements

Part of the Northwestern Pacific, south of Japan, is characterized by a distinctive surrounding physical oceanographic feature known as the Kuroshio current. Some regions have relatively strong tidal currents due to the local topography. Besides, typhoon could cause relatively strong currents in the upper ocean. Towards the utilization of the marine renewable energy and marine resources, prediction of the strong currents are of importance for safe operation. We conducted dynamical downscaling of the ocean conditions south of Japan using numerical ocean model. Based on the comparisons with in-situ and satellite observations, we found the downscaling is effective to some extent. We specified several factors for the improvements.

Academic Significance and Societal Importance of the Research Achievements

黒潮と潮流が混在し、加えて複雑な改訂地形を有する伊豆諸島地域を対象として力学的海洋ダウンスケーリングを実施した。黒潮の再現性ならびに潮流の再現性双方について観測結果との比較を交えて定量的に示すことができ、今後のモデル改善に必要な課題を抽出することができたと考えられ、今後の海洋予報の精度向上につながる社会的意義のあるものだと考えられる。また、潮流の再現性についてはスペクトルナッジングという手法の適用を行い、その潜在性について指摘することができたのも学術的に意義のある研究成果だと考えられる。

Report

(4 results)
  • 2020 Annual Research Report   Final Research Report ( PDF )
  • 2019 Research-status Report
  • 2018 Research-status Report
  • Research Products

    (9 results)

All 2019 2018 Other

All Int'l Joint Research (1 results) Journal Article (3 results) (of which Int'l Joint Research: 2 results,  Peer Reviewed: 3 results,  Open Access: 1 results) Presentation (5 results) (of which Int'l Joint Research: 4 results)

  • [Int'l Joint Research] Environment and Climate Change Canada/Dalhousie University(カナダ)

    • Related Report
      2020 Annual Research Report
  • [Journal Article] Tidally generated island wakes and surface water cooling over Izu Ridge2019

    • Author(s)
      Tsubasa Kodaira and Takuji Waseda
    • Journal Title

      Ocean Dynamics

      Volume: 69 Issue: 11-12 Pages: 1373-1385

    • DOI

      10.1007/s10236-019-01302-1

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Application of the Spectral Nudging on Global Tides Towards a Global Total Water Level Prediction System2019

    • Author(s)
      Tsubasa Kodaira, Natacha Bernier, Keith R. Thompson
    • Journal Title

      International Conference on Ocean, Offshore, and Arctic Engineering (OMAE)

      Volume: 9 Pages: 1-6

    • DOI

      10.1115/omae2019-95842

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] ADCP Observation and Numerical Model Prediction of Tidal Currents Near Kozu Island2018

    • Author(s)
      Tsubasa Kodaira and Takuji Waseda
    • Journal Title

      ASME 2018 37th International Conference on Ocean, Offshore and Arctic Engineering

      Volume: 10 Pages: 1-10

    • DOI

      10.1115/omae2018-78220

    • Related Report
      2018 Research-status Report
    • Peer Reviewed
  • [Presentation] Application of the Spectral Nudging on Global Tides Towards a Global Total Water Level Prediction System2019

    • Author(s)
      Tsubasa Kodaira, Natacha Bernier, Keith R. Thompson
    • Organizer
      ASME 2019 38th International Conference on Ocean, Offshore and Arctic Engineering
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] Spectral nudging of tides in the development of a global total water level prediction system2019

    • Author(s)
      Tsubasa Kodaira, Natacha Bernier, Keith R. Thompson
    • Organizer
      The 11th International Workshop on Modeling the Ocean
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] ADCP Observation and Numerical Model Prediction of Tidal Currents Near Kozu Island2018

    • Author(s)
      Tsubasa Kodaira and Takuji Waseda
    • Organizer
      ASME 2018 37th International Conference on Ocean, Offshore and Arctic Engineering
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] Submesoscale eddies generated by tidal currents around Izu islands south of Japan2018

    • Author(s)
      Tsubasa Kodaira and Takuji Waseda
    • Organizer
      The 10th International Workshop on Modeling the Ocean
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] 伊豆諸島周辺海域における内部潮汐の発生と表層水温の低下について2018

    • Author(s)
      小平翼、早稲田卓爾
    • Organizer
      日本海洋学会
    • Related Report
      2018 Research-status Report

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Published: 2018-04-23   Modified: 2022-01-27  

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