Regarding the local scour phenomenon at the base of a monopile type offshore wind power generator, although some existing formulas have been proposed, the effect of the countermeasure construction has been still unclear. In this study, we investigated the effect of countermeasure construction and conducted the reproduction of the local scour phenomenon using large-scale experiments and numerical calculations. We conducted the experiment under the condition that waves, current, and both waves and current are existed using 50 cm monopile with a scale of 1/13, then investigated the scuring depth in case that countermeasure construction was installed and not installed. As a result, it was confirmed that the countermeasure construction has a effect to reduce scaring around the monopile. We then conducted the calculation of flow around the monopile using three-dimensional numerical simulation. The computed results were consistent with the measured values, thus the validity of our simulation was confirmed. Although the scouring depth and its mechanism have not been elucidated, it is qualitatively inferred that the scouring was occurred due to the relationship with the local velocity and vorticity.
"},{"@language":"ja","@value":"モノパイル式洋上風力発電設備の基礎周辺地盤における局所洗掘現象について，KC数と洗掘深の関係を表す既存式はあるものの，その洗掘防止工の効果はよくわかっていない．そこで本研究では，大規模実験ならびに数値計算を用いて，局所洗掘の再現ならびにその洗掘防止工の効果について検討した．大規模実験では，縮尺1/13の規模で，モノパイルの直径を50cmとし，波，流れ，波と流れの実験を行い，洗掘防止工の有無による洗掘深を検討した．その結果，洗掘防止工により十分な防止効果があることが確認された．次に，3次元数値シミュレーションにより，杭周りの流況解析を実施した．流速など実験結果と整合した結果が得られ，その妥当性を確認することができた．最大洗掘深を定量的に評価するまでには至らなかったものの，局所流速や渦度との関係から洗掘されることを定性的には推測できる．
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