Development of optimum repair model for coastal structures that consist of wave-dissipating blocks

• Project/Area Number: 25420524
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Hydraulic engineering
• Research Institution: Tottori University
• Principal Investigator: OTA TAKAO 鳥取大学, 工学(系)研究科(研究院), 准教授 (70233129)
• Co-Investigator(Kenkyū-buntansha): SATOW Takashi 神戸学院大学, 共通教育センター, 准教授 (30304405)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Project Status: Completed (Fiscal Year 2015)
• Budget Amount: ¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000); Fiscal Year 2015: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000); Fiscal Year 2014: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000); Fiscal Year 2013: ¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000)
• Keywords: 消波ブロック被覆堤 / マルコフ連鎖モデル / 被災進行予測 / 補修 / 断面変形 / 性能変化 / 透水層の抵抗力算定

Outline of Final Research Achievements

Based on the experimental results for profile change of wave-dissipating blocks covering a caisson breakwater, the model profiles for the damaged block layer are made and the relation between the damage progression and change of performance is investigated. The results of the numerical experiment using the model profiles show that the overtopping rate increases by a factor of 1.5 compared to that of the initial profile with damage progression. Furthermore a statistical model based on the Markov chain is applied to the damage progression process and the total cost for the maintenance of wave-dissipating blocks is estimated by using an assumed repair cost and loss. This method can be applied to find a policy of repair that minimizes the total (life cycle) cost and some numerical results are obtained.

Research Products

• [Journal Article] Evaluation of life cycle cost for wave-dissipating works considering occurrence probability of high waves (2016)
  • Author(s): Takao Ota, Hiroyuki Kawamura, Yoshiharu Matsumi, Takayuki Hirayama
  • Journal Title: Journal of Coastal Research Special Issue Volume: 75 Pages: 675-679
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] 数値波動水路における透水層の抵抗力算定法の比較 (2015)
  • Author(s): 太田隆夫，河村裕之，松見吉晴，藤井優，大野賢一
  • Journal Title: 土木学会論文集B3（海洋開発） Volume: 71
  • NAID: 130005097479
  • Peer Reviewed / Acknowledgement Compliant
• [Presentation] 消波ブロック被覆堤における消波工の被災・補修過程のモデル化 (2016)
  • Author(s): 権守真也，河村裕之，城戸克将，太田隆夫，松見吉晴
  • Organizer: 平成28年度土木学会中国支部研究発表会
  • Place of Presentation: 広島工業大学（広島県広島市）
  • Year and Date: 2016-05-21
• [Presentation] 日本海沿岸における波候特性を考慮した消波工のLCC算定 (2016)
  • Author(s): 森田未来，河村裕之，太田隆夫，松見吉晴
  • Organizer: 平成28年度土木学会中国支部研究発表会
  • Place of Presentation: 広島工業大学（広島県広島市）
  • Year and Date: 2016-05-21
• [Presentation] 数値波動水路における透水層の抵抗力算定法の比較 (2015)
  • Author(s): 藤井優，太田隆夫，河村裕之
  • Organizer: 土木学会中国支部研究発表会
  • Place of Presentation: 山口大学工学部（山口県宇部市）
  • Year and Date: 2015-05-23