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Innovation of beach nourishment technology for erosion control based on multi-aspect analyses of beach topography and sediments

Research Project

Project/Area Number 18H01539
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 22040:Hydroengineering-related
Research InstitutionKochi University of Technology

Principal Investigator

SATO Shinji  高知工科大学, システム工学群, 教授 (90170753)

Co-Investigator(Kenkyū-buntansha) 田島 芳満  東京大学, 大学院工学系研究科(工学部), 教授 (20420242)
山中 悠資  東京大学, 大学院工学系研究科(工学部), 助教 (60815108)
下園 武範  東京大学, 大学院工学系研究科(工学部), 准教授 (70452042)
Project Period (FY) 2018-04-01 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥17,160,000 (Direct Cost: ¥13,200,000、Indirect Cost: ¥3,960,000)
Fiscal Year 2020: ¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
Fiscal Year 2019: ¥6,760,000 (Direct Cost: ¥5,200,000、Indirect Cost: ¥1,560,000)
Fiscal Year 2018: ¥6,630,000 (Direct Cost: ¥5,100,000、Indirect Cost: ¥1,530,000)
Keywords海岸過程 / 海岸侵食 / 海岸保全施設の設計 / 養浜 / 海浜過程 / 海岸侵食対策 / 砂礫海岸の変形 / 漂砂 / 海浜地形 / トレンチ調査 / 海浜変形 / 海岸保全施設 / 平衡断面 / 沿岸漂砂 / ルミネッセンス分析
Outline of Final Research Achievements

Beach trench surveys were conducted on sand gravel beaches in Miyazaki and Kochi Coast. The survey in Kochi Coast was conducted on a beach protected by detached breakwaters. Alongshore and cross-shore trenches were excavated with a total length of 150m. The trench faces were recorded by a RTK-UAV and compared with topography data. A clear boundary between sand and gravel layers was observed at a level of 2m above sea level. The bottom gravel layers were considered to be developed by swash waves at the construction of detached breakwaters. The beach was found to be eroded by several high waves in last 15 years. The erosion level, however, was found to be up to the level of sand-gravel boundary, which implied that the sand gravel beach protected by detached breakwaters was resistant to erosion owing to the presence of buried gravel layers.

Academic Significance and Societal Importance of the Research Achievements

海岸地形変化の研究は,地形測量や底質の分析などに基づくものが多いが,これらは,地形表面の特性を分析するもので,海浜の内部構造を解明することはできない.本研究では,海浜のトレンチ調査を実施し,砂礫海岸の侵食耐性を科学的に検証することができた.砂礫海岸における離岸堤背後の海浜形成が10年以上の長期にわたって継続すること,形成された海浜の深部には礫の集積が見られることが明らかとなった.離岸堤などの海岸保全施設の建設による海浜安定には,波浪の制御だけでなく,建設後に形成される海浜内部への礫の集積も大きな役割を果たしていることが明らかとなり,今後の養浜工の最適設計に活用できる資料を取得することができた.

Report

(4 results)
  • 2020 Annual Research Report   Final Research Report ( PDF )
  • 2019 Annual Research Report
  • 2018 Annual Research Report
  • Research Products

    (6 results)

All 2020 2019

All Journal Article (4 results) (of which Peer Reviewed: 3 results) Presentation (2 results)

  • [Journal Article] MECHANISM OF SAND-GRAVEL BEACH MORPHOLOGY INVESTIGATED BY BEACH TRENCH SURVEY2020

    • Author(s)
      佐藤愼司・野口賢二・山中悠資・与那嶺瑞樹
    • Journal Title

      Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)

      Volume: 76 Issue: 2 Pages: I_571-I_576

    • DOI

      10.2208/kaigan.76.2_I_571

    • NAID

      130007935906

    • ISSN
      1883-8944, 1884-2399
    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Mechanism of beach deformation elucidated by bathymetry survey and beach trench survey on Miyazaki Coast2019

    • Author(s)
      Ryota Nomura, Shinji Sato and Kenji Noguchi
    • Journal Title

      Proceedings of the 10th International Conference on Asian and Pacific Coasts

      Volume: 10 Pages: 353-360

    • DOI

      10.1007/978-981-15-0291-0_50

    • ISBN
      9789811502903, 9789811502910
    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Trench survey technique for sand-gravel mixed beach with application at Hamamatsu-Shinohara beach2019

    • Author(s)
      K. Noguchi, Y. Suwa, F. Kato and S. Sato
    • Journal Title

      Proceedings of the 10th International Conference on Asian and Pacific Coasts

      Volume: 10 Pages: 427-434

    • DOI

      10.1007/978-981-15-0291-0_59

    • ISBN
      9789811502903, 9789811502910
    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Spatial and temporal spectra of swash motions estimated by multiple synchronized UAVs2019

    • Author(s)
      R. Shibata, S. Sato, K. Noguchi, F. Kato and R. Kondo
    • Journal Title

      Proceedings of the 10th International Conference on Asian and Pacific Coasts

      Volume: 10 Pages: 971-977

    • DOI

      10.1007/978-981-15-0291-0_133

    • ISBN
      9789811502903, 9789811502910
    • Related Report
      2018 Annual Research Report
  • [Presentation] 海浜トレンチ調査による砂礫海岸形成機構の解明2020

    • Author(s)
      佐藤愼司
    • Organizer
      海岸工学講演会
    • Related Report
      2020 Annual Research Report
  • [Presentation] 海浜トレンチ調査による砂礫海岸形成機構の解明2020

    • Author(s)
      佐藤愼司・野口賢二・山中悠資・与那嶺瑞輝
    • Organizer
      海岸工学講演会、土木学会
    • Related Report
      2019 Annual Research Report

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Published: 2018-04-23   Modified: 2022-01-27  

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