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Breaking Wave Impact Pressure on Vertical Wall

Research Project

Project/Area Number 01550409
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field Hydraulic engineering
Research InstitutionChuo University

Principal Investigator

HATTORI Masataro  Chuo University of Position Faculty of Science and Engineering, Professor, 理工学部, 教授 (90055070)

Project Period (FY) 1989 – 1990
Project Status Completed (Fiscal Year 1990)
Budget Amount *help
¥1,400,000 (Direct Cost: ¥1,400,000)
Fiscal Year 1990: ¥400,000 (Direct Cost: ¥400,000)
Fiscal Year 1989: ¥1,000,000 (Direct Cost: ¥1,000,000)
KeywordsBreaking Wave / Wave Force / Model Experiment / 流体運動可視化 / 高速デ-タ処理
Research Abstract

Impact pressure by breaking waves on a vertical wall gives often rise to serious damages of coastal and harbor structures, and shows high variability in its characteristics. Thus, in this project, generation of the impact pressure is discussed both by time series data of the wave pressure on the wal and high-speed video pictures taken simultaneously with the pressure measurement.
The main findings of this project are as follows ;
(1) The impact pressure occurs when a narrow lens-shaped air pocket is trapped between the vertical wall and the breaking wave front. The impact pressure is divided into two types of the time histories, single impact pressure and damping oscillation associated with impact pressures.
(2) Prediction of the impact pressure should include aerodynamic processes of the trapped air pocket. A simple model, taken into account of the adiabatic process, was proposed. The model indicates that the pressure maxima and pressure frequency are functions of aspect ratio of the air pocket as well as the breaking wave height and water depth in front of the wall at impact.
Virtual mass scale, contributed to the impact process, is determined by comparisons between the model and experiments. The scale is given as a function of the vertical height from the bottom to the breaking wave created at instant of the impact.
(3) Experiments confirm that the single impact pressure occurs when the aspect ratio is smaller than 0.2.
(4) Simultaneous records of the impact pressure and pictures of the high speed video reveals that the damping oscillation associated with impact pressures terminates before release of the trapped air. The damping mechanism can not be specified in this study.

Report

(3 results)
  • 1990 Annual Research Report   Final Research Report Summary
  • 1989 Annual Research Report

Research Products

(13 results)

All Other

All Publications (13 results)

  • [Publications] 荒見 敦史,服部 昌太郎: "衝撃性砕波圧の発生機構に関する実験的研究" 土木学会海岸工学論文集. 36. 579-583 (1989)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] 荒見 敦史,服部 昌太郎: "衝撃砕波圧の実験的研究" 中央大学理工学部紀要. 32. 37-64 (1989)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] 荒見 敦史,服部 昌太郎: "衝撃砕波圧の算定モデル" 土木学会海岸工学論文集. 37. 629-633 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] MASATARO HATTORI,ATSUSHI ARAMI: "Breaking wave impact pressure on vertical wall" Coastal Engineering in Japan (JSCE). (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] A, Arami and M. Hattori: "Experimental study on shocle pressure of breaking waves" Proc. of Coastal Engineering, JSCE. Vol. 36. 579-583 (1989)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] A. Arami and M. Hahori: "Experimeutal study on shock wave pressures" Bulletin of the Faculty of Science and Engineering, Chuo University. Vol. 32. 37-64 (1989)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] A. Arami and M. Hahori: "Predistive model of impact pressure of breaking waves on vertical wall" Proc. of Coastal Engineering, JSCE. Vol. 37. 629-633 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] M. Hatlori and A. Arami: "Breaking wave impact pressure on vertical wall" Coastal Engineering in Japan, JSCE. (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] 荒見 敦史,服部 昌太郎: "衝撃砕波圧の算定モデル" 土木学会、海岸工学論文集. 37. 629-633 (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] MASATARO HATTORI,ATSUSHI ARAMI: "Breaking wave impact pressuve on vertical wall" Coastal Engineering in Japan (JSCE). (1991)

    • Related Report
      1990 Annual Research Report
  • [Publications] 荒見淳史・服部昌太郎: "衝撃性砕波圧の発生機構に関する実験的研究" 土木学会海岸工学論文集. 36. 579-583 (1989)

    • Related Report
      1989 Annual Research Report
  • [Publications] 荒見淳史・服部昌太郎: "衝撃砕波の実験的研究" 中央大学理工学部紀要. 32. 37-64 (1989)

    • Related Report
      1989 Annual Research Report
  • [Publications] 荒見淳史・服部昌太郎: "衝撃砕波圧の算定モデル" 土木学会海岸工学論文集. 37. (1990)

    • Related Report
      1989 Annual Research Report

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Published: 1989-03-31   Modified: 2016-04-21  

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