Experimental study on time factor of scour around pile groups

Lu, Youxiang; Liang, Bingchen; Yin, Zhifu; Pan, Xinying; Wang, Jun; Du, Shengtao

doi:10.1016/j.oceaneng.2022.112125

Cited by 4 publications

(2 citation statements)

References 20 publications

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“…The flume is located at the Shandong Provincial Key Laboratory of Ocean Engineering, Ocean University of China. The detailed experimental settings can be found in the work of Lu, et al [28]. The same cohesionless uniform sediment is used in present work, which means that the median particle size (𝐷 50 ) is 0.66 mm, the geometric standard deviation of particles (𝜎 𝑔 ) is 1.33, and the water depth is 0.30 m. Thus, the critical shear velocity (𝜃 𝑐 ) is 0.029, and the critical flow velocity (𝑈 𝑐 ) is 0.32 m/s.…”

Section: Methodsmentioning

confidence: 99%

Experimental and Numerical Studies on Local Scour around Closely Spaced Circular Piles under the Action of Steady Current

Wang

Yin

et al. 2022

JMSE

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Scour at coastal structures is a serious problem that causes damage to structures. Focusing on scour around typical gravity-type breakwaters, previous studies have revealed that scour is mainly caused by standing waves in the front of structures. For breakwaters, which consist of closely spaced circular piles, scour caused by flow may occupy a dominant position. In the present work, the scour caused by a small velocity intensity flow was studied using both experimental and numerical models. The experiments revealed that the scour depth around closely spaced circular piles was significantly larger than that of a single pile with the same diameter. The numerical model was verified by theoretical values of flow field and experimental values of scour topography. More detailed flow field information is described using a numerical model that can improve the understanding of scour mechanics. Both experimental and numerical models demonstrate that scour first occurs on the side of piles owing to the shrinkage effect of streamlining and then extends forward and backward. In addition, the scour mechanics change with the increase of the pile spacing.

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Section: Methodsmentioning

confidence: 99%

Experimental and Numerical Studies on Local Scour around Closely Spaced Circular Piles under the Action of Steady Current

Wang

Yin

et al. 2022

JMSE

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“…In the past decades, many experimental and theoretical studies have been conducted on the scour phenomenon around piles under various conditions. They include (1) the scour mechanism due to diverse vortex systems (Sumer et al, 1992;Sumer and Fredsøe, 2001;Roulund et al, 2005;Jenkins et al, 2007;Baykal et al, 2015), (2) the scour development process over time and prediction of the scour balance time (McGovern et al, 2014;Ma et al, 2018;Schendel et al, 2018;Lu et al, 2022), and (3) the main factors affecting the scour results and characteristics (Zhao et al, 2010;Yao et al, 2018;Gautam et al, 2021;Yang Q. et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation of offshore wind power pile foundation scour with different arrangements of artificial reefs

et al. 2023

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The industrial integration of offshore wind power and marine ranches has been actively explored and developed in many countries. This emerging industrial synergy can significantly improve the ecological friendliness of offshore wind power and contribute to the development of the marine economy in the region. This industrial synergy is an important development direction for future offshore engineering. Artificial reefs (ARs) are critical components of marine ranches and are widely placed around offshore wind foundations (OWFs). The ARs can block the water flow and form a complex wake region behind it, which changes the original turbulence structure and reduces scour around the OWF. Therefore, determining the arrangement of ARs for scour protection around an OWF is of great engineering significance. In this study, a three-dimensional numerical model is established using a prototype of the first offshore wind power-marine ranch demonstration project in China. The turbulent change and sediment movement between the OWF and ARs are solved using the Reynolds-averaged Navier-Stokes (RANS) and sediment transport equations. Moreover, the variations in the maximum scour depth and scour volume around the OWF at different arrangements of ARs are explored. The results demonstrate that the arrangement of ARs weakens the horseshoe vortices in front of the OWF and destroys the vortex shedding behind the OWF, thereby producing a beneficial scour protection effect. Various arrangements of ARs have different effects on scour results around the OWF. Increasing the height of the AR could significantly reduce the scour results around the OWF and play an effective role in scour protection, followed by the tandem arrangement of ARs, whereas the parallel arrangement of ARs will produce negative scour effects. This study will serve a vital guiding role in the arrangement of ARs and practical significance for scouring protection around the OWF.

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Experimental study of local scour around inclined piles in combined waves and current

Cheng

Cheng²,

Wang³

et al. 2022

Ocean Engineering

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Experimental study on time factor of scour around pile groups

Cited by 4 publications

References 20 publications

Experimental and Numerical Studies on Local Scour around Closely Spaced Circular Piles under the Action of Steady Current

Experimental and Numerical Studies on Local Scour around Closely Spaced Circular Piles under the Action of Steady Current

Numerical simulation of offshore wind power pile foundation scour with different arrangements of artificial reefs

Experimental study of local scour around inclined piles in combined waves and current

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