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Modeling Clear-Water Scour around the High-Rise Structure Foundations (HRSF) of Offshore Wind Farms

Accepted version
Peer-reviewed

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Authors

Xiao, Y 
Jia, H 
Guan, D 
Liang, D 
Yuan, S 

Abstract

The High-Rise Structure Foundation (HRSF) has been used in building the Donghai offshore wind farm in Shanghai, China. So far, few published researches can be found on the local scour around a HRSF. This paper presents the results of a physical modelling investigation of the clear-water scour around two typical HRSF models, consisting of eight piles and ten piles respectively. In the study, the flume bed is covered with uniform non-cohesive sediment and the incoming flow is steady. The effects of the alignment angle of the HRSF, water depth and relative sediment size on the equilibrium scour depth are analyzed. Results show that the maximum scour depth always occurs around the middle piles on the shoulders of the HRSF. The alignment angle of the HRSF has a little influence on the final equilibrium scour depth. For permeable multi-pile foundations, the scour depth increases when the water depth increases within the range of the testing conditions, which indicates a similar trend between a multi-pile foundation and a monopile. An empirical formula is proposed for estimating the equilibrium scour depth.

Description

Keywords

Sediment transport, coastal and offshore engineering

Journal Title

Journal of Coastal Research

Conference Name

Journal ISSN

0749-0208
1551-5036

Volume Title

37

Publisher

Coastal Education and Research Foundation

Rights

All rights reserved
Sponsorship
This research was funded by the National Natural Science Foundation of China (grant number 51779080), the Fok Ying Tung Education Foundation (grant number 20190094210001), the National Key Research and Development Program of China (grant number 2016YFC0402605), the Natural Science Foundation of Jiangsu Province (grant number BK20191299), and the 111 Project (grant number B17015).