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1999 Fiscal Year Final Research Report Summary

Study on influence of multidirectional waves on stability of breakwater

Research Project

Project/Area Number 09650566
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 水工水理学
Research InstitutionTottori University

Principal Investigator

MATSUMI Yoshiharu  Tottori Univ., Faculty of Eng., Associate Professor, 工学部, 助教授 (00135667)

Project Period (FY) 1997 – 1999
KeywordsStability of heads / Multidirectional waves / Wave directionality / Stability of armor stone
Research Abstract

This study complements the wave kinematical investigation on the performance of breakwater heads under uni (2D) and multidirectional (3D) waves. The measurement of velocity field on the heads under 2D and 3D waves was undertaken in the 3D waves basin, the characteristics of the velocity vectors on the heads under 3D waves were assessed by comparing them with the measurements under 2D waves. The sensitive zones of the initial damage in the head sections were evaluated by linking the velocity measurements with the static and dynamic formula for movement of armor stones on the heads. Furthermore, the theoretical approach to the velocity field on the breakwater was carried out to find the cause or mechanism of damages in the heads under multidirectional waves.
The velocity field over the heads under uni and multidirectional waves was only slightly different in the spread of direction of the velocity vectors under the experimental conditions adopted in this study. The prevailing directions of flows under 3D waves was approximately similar to those under 2D waves.
The equations of the critical velocity for armor stone movement in the head and trunk sections could satisfactorily explain the initial damage zones in the damage tests. The middle head section under 3D waves is the most sensitive zone for the initial damage. Under 2D waves, a more sensitive zone appears in back head section.
The stability weight of armor stones at the middle and back head sections under 3D waves becomes approximately 3.5 times heavier than the weight of armor stone in the trunk, which is calculated from the design formulas from Hudson and Van der Meer. Under 2D waves, the stability armor weight in the back head section becomes about 2.5 times value of weight of armor stone in the trunk.

  • Research Products

    (12 results)

All Other

All Publications (12 results)

  • [Publications] 松見吉晴: "Measurement of Wave Kinematics on Breakwater Heads under Multidirectional Waves"27th IAHR Congress Seminar : Multidirectional Waves and their Interaction with Structures. 427-440 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 松見吉晴: "島堤被覆捨石の安定性に及ぼす波の方向分散性の影響について"土木学会海岸工学論文集. 44・2. 951-955 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 松見吉晴: "Wave Kinematics on Breakwater Heads and Stability of Armour Layers under Multidirectional Waves"Proc. 26th Int. Conf. on Coastal Engineering. 2. 1906-1919 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 松見吉晴: "島堤堤体上における多方向不規則波の作用流速と被災特性"土木学会海岸工学論文集. 45・2. 761-765 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 松見吉晴: "多方向不規則波における堤頭部被覆材の安定重量に関する研究"土木学会海岸工学論文集. 46・2. 911-915 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 松見吉晴: "Stability of Armour Units on Breakwater Heads under Multidirectional Waves"Proc. 27th Int. Conf. on Coastal Engineering論文採択済み. (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Yoshiharu Matsumi: "Measurements of Wave Kinematics on Breakwater Heads under Multidirectional Waves"27ィイD1thィエD1 IAHR Congress Seminar Multidirectional Waves and their Interaction with Structures, IAHR. 427-440 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Yoshiharu Matsumi: "Influence of Wave Directionality on Stability of Armor Stone on Breakwater (in Japanese)"Proc. of Coastal Engineering, JSCE. Vol.44(2). 951-955 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Yoshiharu Matsumi: "Wave Kinematics on Breakwater Heads and Stability of Armor Layers under Multidirectional Waves"Proc. 26ィイD1thィエD1 Int. Conf. on Coastal Engineering, ASCE. 1906-1919 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Yoshiharu Matsumi: "Acting Velocity on the Breakwater under Multidirectional waves and Characteristics of Damage of Armor Units (in Japanese)"Proc. of Coastal Engineering, JSCE. Vol.45(2). 761-765 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Yoshiharu Matsumi: "Study on Stable Weight of Armor Units on Breakwater Heads under Multidirectional Waves (in Japanese)"Proc. of Coastal Engineering, JSCE. Vol.46(2). 911-915 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Yoshiharu Matsumi: "Stability of Armor Units on Breakwater Heads under Multidirectional Waves (in accepted)"Proc. 27ィイD1thィエD1 Int. Conf. on Coastal Engineering, ASCE. (2000)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 2001-10-23  

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