| 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)
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| Source Publication | COASTAL ENGINEERING
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| 2019 | |
| Volume | 143Pages:63-75 |
| ISSN | 0378-3839 |
| Abstract | 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. |
| Keyword | 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 |
| Indexed By | SCI ; EI |
| Language | 英语 |
| WOS ID | WOS:000452817100006 |
| WOS Keyword | HORSESHOE VORTEX ; VERTICAL PILES ; MONOPILE |
| WOS Research Area | Engineering, Civil ; Engineering, Ocean |
| WOS Subject | Engineering |
| Funding Organization | National Natural Foundation of China [11602273, 11825205] ; Major State Basic Research Development Program of China (973 Program) [2014CB046204] ; Youth Innovation Promotion Association CAS |
| Classification | 一类 |
| Ranking | 1 |
| Contributor | Gao, FP |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://dspace.imech.ac.cn/handle/311007/78481 |
| Collection | 流固耦合系统力学重点实验室 |
| Affiliation | 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 |
| Recommended Citation 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.Rp_Au:Gao, FP |
| 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. |
| Files in This Item: | Download All | |||||
| File Name/Size | DocType | Version | Access | License | ||
| Jp2019059.pdf（3300KB） | 期刊论文 | 出版稿 | 开放获取 | CC BY-NC-SA | View Download | |
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