Experimental study on local scour for large-diameter mono-column composite bucket foundation for offshore wind turbines

IF 4.2 2区工程技术 Q1 ENGINEERING, CIVIL

Coastal Engineering Pub Date : 2024-08-15 DOI:10.1016/j.coastaleng.2024.104598

Yuhang Zhang , Jinfeng Zhang , Zhengqi Li , Tongqing Chen , Qinghe Zhang , Jiandong Xiao

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引用次数: 0

Abstract

The issue of seabed scour around offshore wind turbine foundations is a significant safety concern. In this study, local scour around a specific type of foundation, known as the large-diameter Mono-Column Composite Bucket Foundation (MCCBF) with six connectors, has been investigated through physical experiments. The study involved various flow conditions, including unidirectional flows, tidal flows, and combinations of regular waves and currents. It has been found that under similar flow intensity and orientation angles, unidirectional flow tends to cause deeper scour depths, but with a more limited extent compared to scour induced by tidal flows. The disparity in maximum scour depth between tidal and unidirectional flows decreases as flow velocity increases. Under regular wave-current interaction, both the scour depth and the scour extent are larger than those induced by unidirectional flow. The presence of lee-wake vortices and streamline contractions near the connectors results in larger scour depths on either side of the foundation, especially when the orientation angle is set to 0°. Different methods for predicting scour depth of the MCCBF were applied and discussed.

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海上风力涡轮机大直径单柱复合斗式基础局部冲刷试验研究

海上风力涡轮机基础周围的海床冲刷问题是一个重大的安全问题。在本研究中，我们通过物理实验研究了一种特定类型的地基（即带有六个连接器的大直径单柱复合斗式地基 (MCCBF)）周围的局部冲刷。研究涉及各种流动条件，包括单向流、潮汐流以及规则波浪和水流的组合。研究发现，在相似的水流强度和方向角条件下，单向流往往会造成更深的冲刷深度，但与潮汐流造成的冲刷相比，单向流造成的冲刷深度更为有限。潮汐流和单向流的最大冲刷深度差异随着流速的增加而减小。在有规律的波流相互作用下，冲刷深度和冲刷范围都大于单向流引起的冲刷。在连接处附近存在的左摇涡流和流线收缩会导致地基两侧的冲刷深度增大，尤其是当定向角设置为 0°时。应用并讨论了预测 MCCBF 冲刷深度的不同方法。

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来源期刊

Coastal Engineering 工程技术-工程：大洋

CiteScore

9.20

自引率

13.60%

发文量

审稿时长

3.5 months

期刊介绍： Coastal Engineering is an international medium for coastal engineers and scientists. Combining practical applications with modern technological and scientific approaches, such as mathematical and numerical modelling, laboratory and field observations and experiments, it publishes fundamental studies as well as case studies on the following aspects of coastal, harbour and offshore engineering: waves, currents and sediment transport; coastal, estuarine and offshore morphology; technical and functional design of coastal and harbour structures; morphological and environmental impact of coastal, harbour and offshore structures.