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Proposal of management technique for coastal and harbor structures covered with wave dissipating blocks including influence of change in wave climate and hydraulic performance of structures

Research Project

Project/Area Number 19K04617
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 22040:Hydroengineering-related
Research InstitutionOsaka University

Principal Investigator

Araki Susumu  大阪大学, 工学研究科, 准教授 (80324804)

Co-Investigator(Kenkyū-buntansha) 小竹 康夫  東洋建設株式会社(総合技術研究所), 土木事業本部, 総合技術研究所長兼鳴尾研究所長 (70599472)
澁谷 容子  東洋建設株式会社(総合技術研究所), 鳴尾研究所, 主任研究員 (10632482)
Project Period (FY) 2019-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2021: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2020: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2019: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
Keywords消波ブロック / 越波 / 波力 / 変形 / ライフサイクルコスト / 維持管理 / 消波性能 / 海象
Outline of Research at the Start

沿岸域に建設された護岸や防波堤の多くは高度経済成長期に建設されたことから,現在,更新時期を迎えており,自然災害に対しても健全性が低下している。地球温暖化に伴う海面上昇や高波の強大化が予想されている中,財政支出を抑制しつつ,老朽化が進行している海岸・港湾構造物の維持管理を適切に行うことが必要である。本研究では,性能保持の観点から補修基準を設定し,今後の海象条件の変化を考慮した効率的かつ合理的な維持管理手法を提案する。

Outline of Final Research Achievements

Wave dissipating work place in front of seawalls is deformed by high incident waves. Wave overtopping rate increased at the beginning of deformation of the wave dissipating work and decreased at a further stage of the deformation. Wave force acting on the seawall behind the wave dissipating work increased monotonically with the increase in the deformation of the wave dissipating work. These results showed that deformed wave dissipating work should be repaired at the stage of moderate deformation. The estimated life cycle cost showed that the repair at the stage of moderate deformation produced inexpensive cost better than the repair at the stage of slight deformation did. The estimated life cycle cost also showed that the partial repair in which profiles of wave dissipating work recover from moderate deformation to slight deformation produced inexpensive cost better than the repair in which profiles of wave dissipating work recover from moderate deformation to the initial profile did.

Academic Significance and Societal Importance of the Research Achievements

消波ブロック被覆工の断面変形等,外見上の変状ではなく,越波量抑制および作用波力軽減等の性能保持の観点から補修基準を設定してライフサイクルコストを算定し,効率的かつ合理的な維持管理について検討した点に本研究成果の学術的意義がある。
社会的意義としては,構造物の老朽化が進行し,かつ予算に限りがある現状において,軽微な損傷を早期に発見する予防保全より,中程度の被災の段階で補修を行う維持管理手法を採用することでコスト削減につながる可能性があることを示した点が挙げられる。

Report

(4 results)
  • 2021 Annual Research Report   Final Research Report ( PDF )
  • 2020 Research-status Report
  • 2019 Research-status Report
  • Research Products

    (6 results)

All 2021 2020 2019

All Journal Article (3 results) (of which Peer Reviewed: 3 results) Presentation (3 results) (of which Int'l Joint Research: 1 results)

  • [Journal Article] Wave Overtopping Rate on Vertical Seawall with Deformed Wave Dissipating Work2021

    • Author(s)
      Araki Susumu、Kotake Yasuo、Kubota Shin-ichi、Shibutani Yoko、Kawauchi Yuka、Yamamoto Fumika
    • Journal Title

      Journal of Coastal Research

      Volume: 114 Issue: sp1 Pages: 176-180

    • DOI

      10.2112/jcr-si114-036.1

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] AN EXPERIMENTAL STUDY ON THE CHARACTERISTICS CHANGE IN WAVE FORCES WITH DEFORMATION OF WAVE DISSIPATION WORKS PLACED IN FRONT OF CAISSON BREAKWATERS2021

    • Author(s)
      澁谷容子, 山本郁佳, 荒木進歩, 久保田真一, 小竹康夫
    • Journal Title

      Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering)

      Volume: 77 Issue: 2 Pages: I_253-I_258

    • DOI

      10.2208/jscejoe.77.2_I_253

    • NAID

      130008094130

    • ISSN
      2185-4688
    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] A STUDY ON EXPECTED DAMAGE AND LIFE CYCLE COST OF STRUCTURES CONSIDERING WAVE EXTREME VALUE DISTRIBUTION2019

    • Author(s)
      SHIBUTANI Yoko、KOTAKE Yasuo、ARAKI Susumu
    • Journal Title

      Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering)

      Volume: 75 Issue: 2 Pages: I_917-I_922

    • DOI

      10.2208/jscejoe.75.I_917

    • NAID

      130007725059

    • ISSN
      2185-4688
    • Related Report
      2019 Research-status Report
    • Peer Reviewed
  • [Presentation] 高波浪により変形した消波工を有する護岸の越波および作用波力特性2021

    • Author(s)
      木場聖也
    • Organizer
      第68回海岸工学講演会
    • Related Report
      2021 Annual Research Report
  • [Presentation] 種々の消波工断面を有する消波ブロック被覆護岸の越波量特性2021

    • Author(s)
      木場聖也
    • Organizer
      2021年度土木学会関西支部年次学術講演会
    • Related Report
      2021 Annual Research Report
  • [Presentation] Wave Overtopping Rate on Vertical Seawall with Deformed Wave Dissipating Work2020

    • Author(s)
      Susumu Araki
    • Organizer
      International Conference on Aquatic Science and Technology
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research

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Published: 2019-04-18   Modified: 2023-01-30  

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