Optimising scour protection stability at offshore foundations

Whitehouse, R.J.S.; Brown, Andrew R.; Audenaert, Sarah; Bolle, Annelies; Schoesitter, Philippe de; Haerens, Piet; Baelus, Leen; Troch, Peter; Neves, Luciana das; Ferradosa, Tiago; Pinto, Paula C.A.G.

doi:10.1201/b17703-79

Cited by 14 publications

(25 citation statements)

References 1 publication

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“…for waves opposing current (7) Despite the reasonable agreement between the predicted and the measured damage number, the test conditions performed by Reference [4] did not include a wide range regarding the water depth (d) or the mean diameter of the armour stones. Later on, References [6,7,30] applied Equation (5) to a wider range of the same variables, concluding that increasing departures from the best fit line (S 3Dmeas = S 3Dpred ) could be noticed. A discussion for possible reasons leading to this is provided in Reference [17], including the influence of the analysis performed on the bathymetric measurements.…”

Section: Dynamically Stable Scour Protectionsmentioning

confidence: 92%

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Probabilistic Comparison of Static and Dynamic Failure Criteria of Scour Protections

Fazeres-Ferradosa

Taveira-Pinto

Rosa-Santos

et al. 2019

JMSE

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The present paper provides a reliability assessment of scour protections applicable to both the static and dynamic stability design. As a case study, Horns Rev 3 hindcast data is used to simulate different failure criteria for an exemplary scour protection suitable for an offshore monopile foundation. The results show that the probability of failure is influenced by several factors, namely the wave friction factor, the definition of the acceptable damage number or the formulations used to calculate the bed shear-stress. The reliability assessment also indicates that annual probabilities of failure, associated to each criterion, might be comparable with the values presented in reliability standards for marine structures. Based on the results, this paper highlights future recommendations to improve the reliability-based design and analysis of scour protections for offshore foundations.

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Section: Dynamically Stable Scour Protectionsmentioning

confidence: 92%

“…Moreover, it was also found that statically stable scour protections could be obtained for a damage number (S 3D ) lower than 0.25. Dynamic scour protections were successfully tested in References [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Probabilistic Comparison of Static and Dynamic Failure Criteria of Scour Protections

Fazeres-Ferradosa

Taveira-Pinto

Rosa-Santos

et al. 2019

JMSE

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“…Nielsen [10] provided an explanation to the sinking of the scour protections in the "Horns Rev 1" wind farm and gave improved guidelines for the design of filter layers through the mobility parameter. Whitehouse et al [11] evoked an optimization of scour protection design taking into account rock size, density, number of layers and width of the cover. Finally, [12] performed experiments using physical models with a scale ranging from 1:100 to 1:50 for the study of edge scour under waves and currents.…”

Section: Introductionmentioning

confidence: 99%

Large-Scale Experiments to Improve Monopile Scour Protection Design Adapted to Climate Change—The PROTEUS Project

Chavez

Stratigaki

et al. 2019

Energies

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This study aims to improve the design of scour protection around offshore wind turbine monopiles, as well as future-proofing them against the impacts of climate change. A series of large-scale experiments have been performed in the context of the European HYDRALAB-PLUS PROTEUS (Protection of offshore wind turbine monopiles against scouring) project in the Fast Flow Facility in HR Wallingford. These experiments make use of state of the art optical and acoustic measurement techniques to assess the damage of scour protections under the combined action of waves and currents. These novel PROTEUS tests focus on the study of the grading of the scour protection material as a stabilizing parameter, which has never been done under the combined action of waves and currents at a large scale. Scale effects are reduced and, thus, design risks are minimized. Moreover, the generated data will support the development of future scour protection designs and the validation of numerical models used by researchers worldwide. The testing program objectives are: (i) to compare the performance of single-layer wide-graded material used against scouring with current design practices; (ii) to verify the stability of the scour protection designs under extreme flow conditions; (iii) to provide a benchmark dataset for scour protection stability at large scale; and (iv) to investigate the scale effects on scour protection stability.

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“…The second category of techniques reduces scour using the approach of bed armoring. For example, hard engineering materials, such as blocks, rack ripraps [17][18][19], and gravel bags [20], are applied on the seabed around the pier to prevent excessive scouring. However, these protective measures have limitations, and not all of them are suited for application to protecting offshore wind turbines.…”

Section: Introductionmentioning

confidence: 99%

A Feasibility Study for Using Fishnet to Protect Offshore Wind Turbine Monopile Foundations from Damage by Scouring

et al. 2019

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Offshore wind turbine monopile foundations are subjected to complex wind, wave, and flow coupling effects, which result in seabed scouring around the monopile. The consequent scour pits threaten the reliability, safety, and load-carrying capacity of the monopile. In order to develop a cost-effective measure to mitigate such an issue, a new countermeasure device, named "fishnet", is studied in this paper using a combined approach of numerical simulations and experimental tests. In the research, the size of the fishnet, diameter of the fishnet thread, and the installation height of the fishnet were optimized in order to achieve the best protection to the monopile foundation. In the paper, both numerical simulations and laboratory tests proved the effectiveness of the proposed "fishnet" in reducing the scour around the wind turbine monopile foundations. Moreover, its contribution to erosion reduction can be further enhanced via optimization. It was found that, after optimization, the maximum shear force on the seabed could be reduced by 14% in the numerical study, and the maximum depth of the scour pit could be reduced by 38.2% in laboratory tests.

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Optimising scour protection stability at offshore foundations

Cited by 14 publications

References 1 publication

Probabilistic Comparison of Static and Dynamic Failure Criteria of Scour Protections

Probabilistic Comparison of Static and Dynamic Failure Criteria of Scour Protections

Large-Scale Experiments to Improve Monopile Scour Protection Design Adapted to Climate Change—The PROTEUS Project

A Feasibility Study for Using Fishnet to Protect Offshore Wind Turbine Monopile Foundations from Damage by Scouring

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