EXPERIMENTAL STUDY ON SCOUR PREVENTION PERFORMANCE OF ANNULAR FILTER UNIT PLACED AROUND MONOPILE FOUNDATION

DOI Web Site 5 References
  • TSUBOKAWA Kotaro
    東京海洋大学大学院 海洋資源環境学専攻
  • MISAWA Hiroki
    伊那食品工業株式会社（元東京海洋大学）
  • NAKAMOTO Shion
    日本風力エネルギー株式会社 (Vena Energy) 事業開発部
  • TANI Kazuo
    東京海洋大学学術研究院 海洋資源エネルギー学部門
  • IKEYA Tsuyoshi
    東京海洋大学学術研究院 海洋資源エネルギー学部門

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Other Title
  • 環状袋型根固め材によるモノパイル基礎周辺の洗掘防止性能に関する実験的研究

Abstract

<p> One of the methods proposed for preventing scour around the monopile foundation of an offshore wind turbine is to cover the seafloor surface with many round filter units. However, it has been pointed out that there is a possibility that these filter units may move, or the sand can be sucked out from the gaps around the monopile.</p><p> In this study, we proposed an annular filter unit that can efficiently prevent these phenomena. A series of model tests were conducted to verify its basic fabrication and construction feasibility, as well as its performance in preventing scouring.</p><p> The results demonstrated that the fabrication and construction would be feasible by appropriately selecting the formwork, using shape-retaining ropes, and installing appropriate amount of stone. It was confirmed that the hydraulic performance could be improved by covering the area of about three times the monopile diameter with the annular filter unit, and that the effectiveness in preventing scour could be enhanced by using round filter units or asphalt mats in combination.</p>

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