Scour Monitoring and Scour Protection Solution for Offshore Gravity Based Foundations

Bolle, Annelies; Mercelis, Peter; Goossens, W.R.A.; Haerens, Piet

doi:10.1061/41147(392)47

Cited by 10 publications

(46 citation statements)

References 2 publications

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“…[16][17][18]). Bolle et al [10] transferred this knowledge to jacket structures, arguing that the distance was clearly above 6 D in their study and thus global scour does not have to be considered. To gain insights into potential effects of global scouring processes on the marine environment and the structures' stability, spatial seabed changes in the vicinity of the structure need to be measured.…”

Section: Introductionmentioning

confidence: 82%

“…This in turn might also impose an effect of superimposing global scouring processes, that possibly contribute to the subsidence of the seabed, in particular around complex structures see, e.g., Rudolph et al [8] and Baelus et al [9]. While the equilibrium scour depth around monopile foundations has been investigated and published extensively over the last decades, limited understanding exists for jacket-type foundations, see [8][9][10][11]. Even though the bed topography was measured, these studies were more focused on the local scour development for specific conditions rather than on the spatial scour development on a global extent.…”

Section: Introductionmentioning

confidence: 99%

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Volume-Based Assessment of Erosion Patterns around a Hydrodynamic Transparent Offshore Structure

et al. 2019

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The present article presents results of a laboratory study on the assessment of erosion patterns around a hydrodynamic transparent offshore foundation exposed to combined waves and currents. The model tests were conducted under irregular, long-crested waves in a scale of 1:30 in a wave-current basin. A terrestrial 3D laser scanner was used to acquire data of the sediment surface around the foundation structure. Tests have been conducted systematically varying from wave- to current-dominated conditions. Different volume analyzing methods are introduced, which can be related for any offshore or coastal structure to disclose physical processes in complex erosion patterns. Empirical formulations are proposed for the quantification of spatially eroded sediment volumes and scour depths in the near-field and vicinity of the structure. Findings from the present study agree well with in-situ data stemming from the field. Contrasting spatial erosion development between experimental and in-situ data determines a stable maximum of erosion intensity at a distance of 1.25 A, 1.25 times the structure’s footprint A, as well as a global scour extent of 2.1–2.7 A within the present study and about 2.7–2.8 A from the field. By this means, a structure-induced environmental footprint as a measure for erosion of sediment affecting marine habitat is quantified.

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Section: Introductionmentioning

confidence: 82%

Section: Introductionmentioning

confidence: 99%

Volume-Based Assessment of Erosion Patterns around a Hydrodynamic Transparent Offshore Structure

et al. 2019

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“…Monitoring data for vertical foundation structure types other than monopiles in the marine environment have been presented by Bolle et al (2010;, Stuyts et al (2013) and Rudolph et al (2004). Bolle et al (2010) describe some of the early monitoring results at the six gravity base foundations installed on Thornton Bank off the Belgian Coast in 2009. Scour protection has been installed at the foundations and whilst initial concerns were related to secondary scour around the protection, the early results indicated sedimentation occurring over the protection.…”

Section: Scour Prediction In Marine Soilsmentioning

confidence: 99%

“…Scour protection has been installed at the foundations and whilst initial concerns were related to secondary scour around the protection, the early results indicated sedimentation occurring over the protection. Bolle et al (2012) describe scour development at the Thornton Bank wind farm, focusing, primarily, on scour around the jacket foundations. The wind farm is located about 30 km off the Belgian Coast, and the jackets are situated in water depths of about 12 -30 m. The scour development has two phases, that due to prepiling (prior to jacket installation) and then the second phase related to the foundation completion with the jacket in place.…”

Section: Scour Prediction In Marine Soilsmentioning

confidence: 99%

Advanced numerical modelling of scour and erosion

Cheng¹,

Draper²,

An³

2014

Scour and Erosion

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Scour associated with anthropogenic activities in the marine environment has exercised the minds of scientists and engineers for decades. Despite the advances in understanding there remain areas of uncertainty which require further examination and challenges that require further research. Whilst real-life scour problems often help formulate the questions for detailed laboratory experiments, the associated information is less often used to answer some of those questions and yet the available data can offer the chance of exploring the scour at full-scale using real marine soils, albeit with all the inherent uncertainty associated with measurements obtained in the field. It can be argued that through the interpretation of these data, it forces the scientist and engineer to not only explore in more detail the limitations of the measurements but to engage in the full range of processes, whether physical (e.g. hydrodynamics and meteorological forcing) or biological (e.g. marine growth, benthic organisms) that impact on structures placed in what are often, very challenging environments.

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“…Field investigations of scour protections over longer periods (years) have been reported by Hansen et al [13], Raaijmakers et al [14,15], Bolle et al [16], Whitehouse et al [17], Nielsen et al [18] and Petersen et al [19], among others, and these studies reveal the dynamic response of the scour protections to the mentioned failure modes. Some cases of deformation were expected from design considerations, while others involved significant settlements, and costly repair measures of the scour protections have been made to ensure the structural stability of the foundations.…”

Section: Introductionmentioning

confidence: 92%

Onset of Motion of Sediment underneath Scour Protection around a Monopile

Nielsen

Petersen

2018

JMSE

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The stability of scour protections is, potentially, an important issue during the design of fixed foundations for offshore wind turbines. One of the failure mechanisms observed at placed scour protection around offshore foundations is suction of sediment through the scour protection and subsequent sinking of the scour protection. Incipient motion of sediment and the initiation of suction underneath scour protections around piles in the marine environment were studied under waves, current and combined waves and current conditions. The motion of a thin layer of sediment underneath the scour protection was studied through the glass bottom of the test flume, which provided a clear view of the initiation of the motion of the sediment. The results show that the mobility depends on the Keulegan–Carpenter ( K C ) number for the pile, the ratio between waves and current flow and the ratio between the thickness of the scour protection and the base sediment. The critical mobility number is smaller for the wave-dominated situation compared to current-dominated conditions, which again are smaller than for combined waves and current conditions. Consequently, larger K C -numbers cause larger critical mobility numbers than smaller K C -numbers. Design diagrams are presented for the threshold of incipient motion of sediment underneath a scour protection in waves, current and combined waves and current.

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Scour Monitoring and Scour Protection Solution for Offshore Gravity Based Foundations

Cited by 10 publications

References 2 publications

Volume-Based Assessment of Erosion Patterns around a Hydrodynamic Transparent Offshore Structure

Volume-Based Assessment of Erosion Patterns around a Hydrodynamic Transparent Offshore Structure

Advanced numerical modelling of scour and erosion

Onset of Motion of Sediment underneath Scour Protection around a Monopile

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