臺灣能源期刊第4卷第3期-臺灣能源期刊論文全文-能源期刊-能源知識庫

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臺灣能源期刊論文全文

出刊日期：September, 2017

Title: Scour Behavior Analysis for the Mono-Pile Substructure of the Offshore Wind Turbine

摘要: 本文主要探討離岸風機單樁式支撐結構之沖刷坑發展過程。海床底部之泥沙移動現象主要由BVRM模型所描述。BVRM模型計算結果與所比對之文獻結果趨勢一致。接著採用包括洋流與規則波等水動力負載進行離岸風機支撐結構沖刷坑發展現象分析，並將無因次化參數-最大沖刷坑之深度/樁徑與文獻結果進行比對。文獻當中採用簡易模型之結果(1.24 ~ 1.5)高於實際觀測值(0.125 ~ 1.66)。而本研究之數值模型計算出之結果數值較低(0.33)，但還在所蒐集之文獻數值範圍當中。本研究建立之數值模型可用於評估離岸風機支撐結構周圍之沖刷坑最大深度與範圍。

Abatract: In the present study, the development of the scour around the support structure for an offshore wind turbine (OWT) has been investigated. The behavior of sand on the seabed is calculated by the developed Bi-Viscous Rheological Model (BVRM). The comparison of the developed model with the experimental study has been conducted. Results by the numerical model consistent well with compared case. The combined hydrodynamic load, including current and regular wave, are incorporated into the developed numerical model with the validated BVRM and the variation of scour distribution is presented and discussed. The maximum scour depth/diameter of mono-pile (S/D) by the observed data is compared with the estimation by the proposed numerical model. The empirical formula in literature is also included into the comparison. Empirical formulation from the surveyed studies leads to the larger S/D value (1.24 ~ 1.5) comparing to the measured data among the surveyed studies (0.125 ~ 1.66). Although this paper predicts the smaller value of S/D (0.33), it is still within the range of the measured data of surveyed studies. The developed numerical model is applicable to predict the variation of scour distribution and the maximum scour depth around the support structure of the OWT can be evaluated.