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INVESTIGATIONS ON HYDRAILIC FORCES DUE TO CURRENT INCLUDING CORAL PIECES ACCOMPANIED BY BREAKDER AT REEF FRONT AND WAVE DAMPING EFFECT OF SEA BEDWITH GROUP OF CORAL BLOCKS

Research Project

Project/Area Number 05680373
Research Category

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

Allocation TypeSingle-year Grants
Research Field Natural disaster science
Research InstitutionUNIVERSITY OF THE RYUKYUS

Principal Investigator

TSUKAYAMA Seiko  UNIVERSITY OF THE RYUKYUS,DEPARTMENT OF ENGINEERING,PROFESSOR, 工学部, 教授 (50044996)

Co-Investigator(Kenkyū-buntansha) NAKAZA Eizo  UNIVERSITY OF THE RYUKYUS,DEPARTMENT OF ENGINEERING,RESEARCH ASSOCIATE, 工学部, 助手 (90180265)
Project Period (FY) 1993 – 1994
Project Status Completed (Fiscal Year 1994)
Budget Amount *help
¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1994: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1993: ¥1,300,000 (Direct Cost: ¥1,300,000)
KeywordsForce of current due to breaker16FA02 : Wave current in reef coast / Wave damping effect of sea bed / Group of coral blocks / Coefficient of wave transmission / 波浪減衰係数 / 波郎減衰効果 / 波郎減衰係数
Research Abstract

The investigation carried out through field observations, model experiments and theoretical analysis. Main results of this investigation can be summerised as follws ;
(1) It is clarified after fied observations on reef coasts under typhoon conditions that the wave heights reduce exponencially with traveling from the breaking point in front of reef to seashores, and shown good agreement with caluculated result by the formula suggested by the authors, where with the value of oefficients of the formula decided as function of relative depth to incident wave heights in the sea coast.
(2) The mechanical process of breaking waves result in violent current at the reef front have been clarified experimentally, and the currents are categorised in two types according to the patern of wave breaking of spilling or plunging breaker.
(3) Experimentallly, it has been clarified that wave damping effects of the sea bed with coral blocks depend on not only usual frictional effect of the sea bed, but also the effects of form resistance of coral blocks due to wakes that occure behind each block. The experimental results were verified by comparison with the fields observations.

Report

(3 results)
  • 1994 Annual Research Report   Final Research Report Summary
  • 1993 Annual Research Report

Research Products

(6 results)

All Other

All Publications (6 results)

  • [Publications] 津嘉山 正光,仲座 栄三: "サンゴ岩塊群の波浪減衰効果に関する研究" 琉球大学工学部紀要. 第48号. 31-39 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] 仲座 栄三,津嘉山 正光,田仲 聡: "リ-フ海岸における波・サーフビ-トに関する研究" 海岸工学論文集. 第41. 86-90 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] Eizo NAKAZA,Seiko TSUKAYAMA and Satoshi TANAKA: "Studies on Long-period Wave and Surf-Beat in Reef Coast" Proceedings of Coastal Engineering in Japan, JSCE. Vol.41. 86-90 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] Sekio TSUKAYAMA and Eizo NAKAZA18GB02 : Wave Damping Effect of Sea Bed with Group of Reef Blocks: Bulletin of the Faculty of Engineering, University of the Ryukyus. No.48. 31-39 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] 津嘉山正光・仲座栄三: "サンゴ岩塊群の波浪減衰効果に関する研究" 琉球大学工学部紀要. 第48号. 31-39 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] 仲座栄三・津嘉山正光・田仲聡: "リ-フ海岸における波・サーフビ-トに関する研究" 海岸工学論文集. 第41. 86-90 (1994)

    • Related Report
      1994 Annual Research Report

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Published: 1993-03-31   Modified: 2016-04-21  

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