Physical modelling of local scour at twin piles under combined waves and current

doi:10.1016/j.coastaleng.2018.10.009

IMECH-IR > 流固耦合系统力学重点实验室

	Physical modelling of local scour at twin piles under combined waves and current
	Qi WG(漆文刚); Li YX ; Xu K; Gao FP(高福平)
发表期刊	COASTAL ENGINEERING
	2019
卷号	143 页码:63-75
ISSN	0378-3839
摘要	Under the actions of ocean waves and current, severe local scour can be induced around pile groups, significantly compromising the safety of marine structures. A series of flume tests were conducted for physical modelling the local scouring process around twin piles in the cohesionless soils under combined waves and currents, and compared with the pure current case. The effects of non-dimensional pile spacing (G/D) and flow skew angle (alpha) on the scour depth and time scale of scour around twin piles are intensively examined. The experimental observations indicate that the influence of pile spacing on the scour depth development is much more significant for the side-by-side (alpha = 90 degrees) arrangement than that for the tandem arrangement (alpha = 0 degrees). With the increase of flow skew angle alpha, the maximum scour depth is remarkably enhanced within the examined range 0 <= G/D <= 3.0. When G/D = 3.0, the pile group effect on the time scale is generally negligible for pure current cases, whereas a prominent pile-group effect can still be observed for combined wave-current cases, especially for the side-by-side arrangement. A parameter of "equivalent pile diameter" is then introduced for evaluating the maximum scour depth at the twin piles with the previous formulas for the single pile. Based on the existing and present experimental data, the empirical formula of dimensionless equivalent pile diameter as the function of G/D and alpha is established to predict the maximum scour depth at the twin piles.
关键词	Local scour Twin piles Pile-group Skew angle Horseshoe vortex PIV technique Combined waves and current Time scale Equivalent pile diameter
DOI	10.1016/j.coastaleng.2018.10.009
收录类别	SCI ; EI
语种	英语
WOS记录号	WOS:000452817100006
关键词[WOS]	HORSESHOE VORTEX ; VERTICAL PILES ; MONOPILE
WOS研究方向	Engineering, Civil ; Engineering, Ocean
WOS类目	Engineering
项目资助者	National Natural Foundation of China [11602273, 11825205] ; Major State Basic Research Development Program of China (973 Program) [2014CB046204] ; Youth Innovation Promotion Association CAS
论文分区	一类
力学所作者排名	1
RpAuthor	Gao, FP
引用统计	被引频次：43[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://dspace.imech.ac.cn/handle/311007/78481
专题	流固耦合系统力学重点实验室
作者单位	1.{Qi, Wen-Gang、Li, Yi-Xuan、Xu, Kai、Gao, Fu-Ping} Chinese Acad Sci, Inst Mech, Key Lab Mech Fluid Solid Coupling Syst, Beijing 100190, Peoples R China 2.{Qi, Wen-Gang、Li, Yi-Xuan、Xu, Kai、Gao, Fu-Ping} Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China 3.{Li, Yi-Xuan} China State Construct Engn Corp Ltd, Civil Infrastruct Operat Dept, Beijing 100044, Peoples R China
推荐引用方式 GB/T 7714	Qi WG,Li YX,Xu K,et al. Physical modelling of local scour at twin piles under combined waves and current[J]. COASTAL ENGINEERING,2019,143:63-75.
APA	漆文刚,Li YX,Xu K,&高福平.(2019).Physical modelling of local scour at twin piles under combined waves and current.COASTAL ENGINEERING,143,63-75.
MLA	漆文刚,et al."Physical modelling of local scour at twin piles under combined waves and current".COASTAL ENGINEERING 143(2019):63-75.

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