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Internal mechanism of giant waves in multidirectional irregular waves and estimation of their impact forces

Research Project

Project/Area Number 20H02369
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 24020:Marine engineering-related
Research InstitutionHiroshima University

Principal Investigator

Mutsuda Hidemi  広島大学, 先進理工系科学研究科(工), 教授 (80273126)

Co-Investigator(Kenkyū-buntansha) 田中 義和  広島大学, 先進理工系科学研究科(工), 准教授 (00335704)
谷口 直和  広島大学, 工学研究院, 研究員 (30711733)
Project Period (FY) 2020-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥17,940,000 (Direct Cost: ¥13,800,000、Indirect Cost: ¥4,140,000)
Fiscal Year 2022: ¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2021: ¥6,240,000 (Direct Cost: ¥4,800,000、Indirect Cost: ¥1,440,000)
Fiscal Year 2020: ¥7,800,000 (Direct Cost: ¥6,000,000、Indirect Cost: ¥1,800,000)
Keywords海洋巨大波 / 洋上風力発電施設 / 粒子法 / Draupner Wave / Freak Wave / 砕波 / 浮体構造物 / 多方向不規則波 / 海洋構造物 / 洋上風力発電 / 衝撃圧 / 衝撃力 / Freak wave / Draupner wave / 衝撃砕波圧 / 音響トモグラフィー
Outline of Research at the Start

本研究は,(1) 様々な海象条件下における海洋巨大波の実態とその成因を解明するとともに,(2) 海洋巨大波が各種海洋構造物に及ぼす影響を明らかにし,(3) これらに基づいた海洋巨大波の予測法と回避策の提示,(4) さらには構造物の設計指針を新たに提案することである.また,本申請課題は,オックスフォード大学が構築した世界初の海洋巨大波の波動理論とエジンバラ大学所有の世界唯一の円形型FloWave水槽を用いて,様々な海象条件下で出現する多方向不規則波浪群において出現する砕波を伴う海洋巨大波を生成し,4次元力学諸量を取得するとともに,砕波を伴う海洋巨大波の実態解明とその成因を解明する点にある.

Outline of Final Research Achievements

A numerical design tool that takes into account large tsunamis and extreme waves (Freak waves, triangular waves, Draupner waves, etc.) that occur near Japan is necessary, and it is important to estimate exciting force and 6DoF motions of ocean structures. The purpose of this study is to elucidate the generation/development mechanism, wave breaking/attenuation mechanism of giant waves generated in multi-directional irregular waves in real sea states from a physical and engineering point of view. This study focused on, (1) Estimation of exciting wave loads of giant waves acting on a moored floating structure, (2) Breaking and emergence prediction of giant waves, (3) Rational calculation of impact loads caused by giant waves, (4) Prediction and risk assessment of encounters with giant waves that hinder the management and operation of offshore structures were investigated.

Academic Significance and Societal Importance of the Research Achievements

我が国近海で発生する大津波や極限波浪(Freak wave,三角波,Draupner waveなど)を考慮した設計ツールは必要不可欠であり,それに基づく合理的な設計値を推定することが重要である.本研究成果は,多方向不規則波群によって発生する砕波を伴うDraupner Waveに着目して,その発生・発達・砕波・減衰機構,さらには砕波形式による物理機構の比較を行っており,学術的意義は非常に高い.また,海洋巨大波に関わる海洋工学,海岸工学,船舶工学,海洋物理学分野の学理研究の飛躍的な進歩に繋がるため,海難事故の防災・減災,人命保護,各種海洋構造物の管理運用等の社会的要請に応えるものである.

Report

(4 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Annual Research Report
  • 2020 Annual Research Report
  • Research Products

    (10 results)

All 2023 2022 2021 2020 Other

All Int'l Joint Research (2 results) Journal Article (7 results) (of which Int'l Joint Research: 5 results,  Peer Reviewed: 7 results,  Open Access: 1 results) Presentation (1 results) (of which Int'l Joint Research: 1 results)

  • [Int'l Joint Research] エジンバラ大学/オックスフォード大学/マンチェスター大学(英国)

    • Related Report
      2021 Annual Research Report
  • [Int'l Joint Research] エジンバラ大学/オックスフォード大学/マンチェスター大学(英国)

    • Related Report
      2020 Annual Research Report
  • [Journal Article] Reconstruction of horizontal tidal current fields in a shallow water with model-oriented coastal acoustic tomography2023

    • Author(s)
      Taniguchi Naokazu、Mutsuda Hidemi、Arai Masazumi、Sakuno Yuji、Hamada Kunihiro、Takahashi Toshiyuki、Yoshiki Kengo、Yamamoto Hironori
    • Journal Title

      Frontiers in Marine Science

      Volume: 10 Pages: 1-16

    • DOI

      10.3389/fmars.2023.1112592

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Coastal Acoustic Tomography of the Neko-Seto Channel with a Focus on the Generation of Nonlinear Tidal Currents~Revisiting the First Experiment2022

    • Author(s)
      Minmo Chen, Aruni Dinan Hanifa, Naokazu Taniguchi, Hidemi Mutsuda, Xiao-Hua Zhu , Ze-Nan Zhu, Chuanzheng Zhang, Ju Lin, Arata Kaneko
    • Journal Title

      remote sensing

      Volume: 14 Issue: 7 Pages: 1-12

    • DOI

      10.3390/rs14071699

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] The effects of smoothing length on the onset of wave breaking in smoothed particle hydrodynamics (SPH) simulations of highly directionally spread waves2022

    • Author(s)
      T. Kanehira, M.L. McAllister, S. Draycott, T. Nakashima, D.M. Ingram, T.S. van den Bremer, H. Mutsuda
    • Journal Title

      Computational Particle Mechanics

      Volume: - Issue: 5 Pages: 1-17

    • DOI

      10.1007/s40571-022-00463-z

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Highly directionally spread, overturning breaking waves modelled with Smoothed Particle Hydrodynamics: A case study involving the Draupner wave2021

    • Author(s)
      T. Kanehira, M.L. McAllister, S. Draycott, T. Nakashima, N. Taniguchi, D.M. Ingram, T.S. van den Bremer, H. Mutsuda
    • Journal Title

      Ocean Modelling

      Volume: 164 Pages: 1-14

    • DOI

      10.1016/j.ocemod.2021.101822

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Constructive and Destructive Interference Locations of Waves in a Circular Wave Basin - Study of Velocity Component Perpendicular to Wave Direction2021

    • Author(s)
      Taiga Kanehira, Roman Gabl, Laura-Beth Jordan, Thomas Davey, Takuji Nakashima, Naokazu Taniguchi, David Ingram, Hidemi Mutsuda
    • Journal Title

      Proceedings of the 31th International Society of Offshore and Polar Engineers

      Volume: 1 Pages: 1-8

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Numerical Recreation of the Draupner Wave in Crossing Wave Systems Using Smoothed Particle Hydrodynamics2020

    • Author(s)
      Kanehira Taiga、McAllister Mark L.、Draycott Samuel、Nakashima Takuji、Taniguchi Naokazu、Doi Yasuaki、Ingram David、van den Bremer Ton S.、Mutsuda Hidemi
    • Journal Title

      Proceedings of the 39th International Conference on Ocean, Offshore and Arctic Engineering, OMAE, virtual conference, USA

      Volume: - Pages: 1-8

    • DOI

      10.1115/omae2020-18359

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Numerical re-creation of multi-directional waves in a circular basin using a particle based method2020

    • Author(s)
      Taiga Kanehira, Hidemi Mutsuda, Samuel Draycott, Naokazu Taniguchi, Takuji Nakashima, Yasuaki Doi, David Ingram
    • Journal Title

      Ocean Engineering

      Volume: 209 Pages: 107446-107446

    • DOI

      10.1016/j.oceaneng.2020.107446

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] Constructive and Destructive Interference Locations of Waves in a Circular Wave Basin - Study of Velocity Component Perpendicular to Wave Direction2021

    • Author(s)
      Taiga Kanehira, Roman Gabl, Laura-Beth Jordan, Thomas Davey, Takuji Nakashima, Naokazu Taniguchi, David Ingram, Hidemi Mutsuda
    • Organizer
      Proceedings of the 31th International Society of Offshore and Polar Engineers
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research

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Published: 2020-04-28   Modified: 2024-01-30  

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