Prediction of local scour depth at offshore wind turbine monopile foundation in combined waves and current

被引：0
|
作者：
Du S. [1 ,2 ]
Dai G. [1 ,2 ]
Gao L. [1 ,2 ]
Wan Z. [1 ,2 ]
Zhu M. [1 ,2 ]
机构：
[1] Key Laboratory of Concrete and Prestressed Concrete Structures of Ministry of Education, Southeast University, Nanjing
[2] School of Civil Engineering, Southeast University, Nanjing
来源：
Dongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Southeast University (Natural Science Edition) | 2020年 / 50卷 / 04期
关键词：
Dimensional analysis; Local scour depth; Monopile; Offshore wind turbine; Waves and current;
D O I：
10.3969/j.issn.1001-0505.2020.04.003
中图分类号：
学科分类号：
摘要：
The local scour mechanism of the offshore wind turbine monopile foundation is relatively complex in the combined waves and current, leading to the differences in the existing local scour depth prediction methods. Based on the dimensional analysis principle and experimental data, an empirical formula is proposed for predicting local scour depth, which considers the main controlling factors in combined waves and current. Combined with the field monitoring data of Rudong offshore wind power plant in Jiangsu Province, four statistical evaluation indicators were used to compare the performance of the predictive equations of local scour depth, including Chinese standard formula, DNV formula, HEC-18 formula, Rudolph formula, Raaijmakers formula and the proposed formula. The predicted values of the proposed formula are in good agreement with the field monitoring data, and the relative error, the average absolute relative error(20.10%), the variance(3.90%) and the normalized variance(3.93%) are all smaller than those of the other formulae, indicating that the proposed prediction formula is reasonable and effective. This research provides a theoretical reference for the local scour design of offshore wind turbine. © 2020, Editorial Department of Journal of Southeast University. All right reserved.
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页码：616 / 622
页数：6
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