Edge scour at scour protections around piles in the marine environment - Laboratory and field investigation

被引:74
作者
Petersen, Thor Ugelvig [1 ]
Sumer, B. Mutlu [2 ]
Fredsoe, Jorgen [2 ]
Raaijmakers, Tim C. [3 ]
Schouten, Jan-Joost [3 ]
机构
[1] DHI, Dept Ports & Offshore Technol, DK-2970 Horsholm, Denmark
[2] Tech Univ Denmark, DTU Mekan, Sect Fluid Mech Coastal & Maritime Engn, DK-2800 Lyngby, Denmark
[3] Deltares, NL-2600 MH Delft, Netherlands
关键词
Edge scour; Steady current; Scour protection; Scour; Offshore wind farm; Secondary scour; CIRCULAR-CYLINDER; LOCAL SCOUR; FLOW; FAILURE; SINKING; SURFACE; VORTEX; WAVES; LAYER;
D O I
10.1016/j.coastaleng.2015.08.007
中图分类号
TU [建筑科学];
学科分类号
0813 ;
摘要
When building offshore wind turbines with monopile foundations, scour protection typically is placed to avoid scouring of the soil close to the monopile. An important aspect is that the scour protection itself causes erosion, inflicted by the local increase in current and/or wave velocities and in turn increased bed shear stresses. Scour of the edge material alongside the scour protection may cause deformations and failure of the scour protection of offshore wind turbine foundations. This can reduce the stability of the stone layer and cause exposure of cables running between the monopiles where they go from buried to the transition piece on the foundation. Although much information is available on the design of scour protection systems around monopiles, little is known on the mechanisms causing edge scour and the equilibrium stages of the edge scour process in steady current, waves and combined waves and current. This paper presents an extensive experimental campaign to explain the edge scour process in current and combined irregular waves and current, as well as tidal current. The three-dimensional flow field around the pile and scour protection is resolved by particle image velocimetry and bed shear stress measurements, showing a local increase in the flow velocities and bed shear stresses leading to increased sediment transport and scour. The governing process in steady current is a pair of symmetrical counter-rotating vortices emerging in the near bed region in the wake of the pile and scour protection, causing a significant downstream scour hole. It is found that the equilibrium scour hole depth and length scales with the pile diameter and the ratio between the thickness- and the width of the scour protection. In the second part of the present paper, the results from the experimental campaign are compared with the edge scour experienced in practice, outlined by a survey program of the offshore wind park Egmond Aan Zee and a published field investigation of Scroby Sands OWE by Whitehouse et al. (2011). (C) 2015 Elsevier B.V. All rights reserved.
引用
收藏
页码:42 / 72
页数:31
相关论文
共 50 条
  • [21] A Review on Recent Development of Numerical Modelling of Local Scour around Hydraulic and Marine Structures
    Zhao, Ming
    JOURNAL OF MARINE SCIENCE AND ENGINEERING, 2022, 10 (08)
  • [22] Local scour around tandem square porous piles in steady current
    Yang, Fan
    Qu, Lili
    Zhang, Qin
    Tang, Guangqiang
    Liang, Bingchen
    OCEAN ENGINEERING, 2021, 236
  • [23] Turbulent Flow Field around Horizontal Cylinders with Scour Hole
    Penna, Nadia
    Coscarella, Francesco
    Gaudio, Roberto
    WATER, 2020, 12 (01)
  • [24] Laboratory Study of Local Scour Around an Array of Pile Groups in Clear-Water Scour Conditions
    Gong, Ming
    Pan, Xinying
    Du, Shengtao
    Wu, Guoxiang
    Lv, Yingxue
    Sun, Yunjia
    Ding, Guangjia
    Liang, Bingchen
    JOURNAL OF MARINE SCIENCE AND ENGINEERING, 2025, 13 (01)
  • [25] Numerical prediction of scour around piles in near shore region
    Mani, JS
    HYDRAULICS FOR MARITIME ENGINEERING, THEME E, PROCEEDINGS: 21ST CENTURY: THE NEW ERA FOR HYDRAULIC RESEARCH AND ITS APPLICATIONS, 2001, : 207 - 211
  • [26] Methods for predicting seabed scour around marine current turbine
    Chen, Long
    Lam, Wei-Haur
    RENEWABLE & SUSTAINABLE ENERGY REVIEWS, 2014, 29 : 683 - 692
  • [27] Numerical investigation of local scour around submerged pipeline in shoaling conditions
    Liu, Ming-ming
    OCEAN ENGINEERING, 2021, 234
  • [28] Effects of the gap on the local scour around two tandem piles in shallow flows
    Zhao, Shengxiao
    Ji, Chunning
    Sun, Zhenzhou
    Yu, Huafeng
    Zhang, Zhimeng
    OCEAN ENGINEERING, 2022, 246
  • [29] EXPERIMENTAL INVESTIGATION ON SCOUR AROUND MARINE PIPELINES IN SILT BEDS BY JET TRENCHING
    Bai, Zhigang
    Lv, Ruochen
    Meng, Ran
    ADVANCES IN CIVIL ENGINEERING II, PTS 1-4, 2013, 256-259 : 1956 - 1959
  • [30] Scour Protections for Offshore Foundations of Marine Energy Harvesting Technologies: A Review
    Fazeres-Ferradosa, Tiago
    Chambel, Joao
    Taveira-Pinto, Francisco
    Rosa-Santos, Paulo
    Taveira-Pinto, Francisco V. C.
    Giannini, Gianmaria
    Haerens, Piet
    JOURNAL OF MARINE SCIENCE AND ENGINEERING, 2021, 9 (03)