Edge scour at scour protections around offshore wind turbine foundations

Petersen, Thor Ugelvig; Sumer, B. Mutlu; Fredsøe, Jørgen

doi:10.1201/b17703-78

Cited by 18 publications

(20 citation statements)

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“…It should be noted that, as mentioned previously, recently Petersen [17] studied edge scour at the scour protection around the foundation of a wind turbine by physical model experiments. He found that the edge scour at the downstream side of the scour protection is mainly caused by the LSCSVs in the lee wake of scour protection and the pile system.…”

Section: (B) Lee-wake Flowmentioning

confidence: 89%

Numerical investigation of flow and scour around a vertical circular cylinder

Baykal

Sumer

Fuhrman

et al. 2015

Phil. Trans. R. Soc. A.

123

104

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Flow and scour around a vertical cylinder exposed to current are investigated by using a three-dimensional numerical model based on incompressible Reynolds-averaged Navier–Stokes equations. The model incorporates (i) k - ω turbulence closure, (ii) vortex-shedding processes, (iii) sediment transport (both bed and suspended load), as well as (iv) bed morphology. The influence of vortex shedding and suspended load on the scour are specifically investigated. For the selected geometry and flow conditions, it is found that the equilibrium scour depth is decreased by 50% when the suspended sediment transport is not accounted for. Alternatively, the effects of vortex shedding are found to be limited to the very early stage of the scour process. Flow features such as the horseshoe vortex, as well as lee-wake vortices, including their vertical frequency variation, are discussed. Large-scale counter-rotating streamwise phase-averaged vortices in the lee wake are likewise demonstrated via numerical flow visualization. These features are linked to scour around a vertical pile in a steady current.

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Section: (B) Lee-wake Flowmentioning

confidence: 89%

Numerical investigation of flow and scour around a vertical circular cylinder

Baykal

Sumer

Fuhrman

et al. 2015

Phil. Trans. R. Soc. A.

123

104

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show abstract

“…Table 3 includes the general characteristics, Table 4 the characteristics of foundations and scour protections and Table 5 the metocean conditions. The information included in these three tables are taken, mainly, from the [29][30][31][32][33][34][35][36][37][38][39][40][41][42][43][44][45]. Table 3.…”

Section: Case Studiesmentioning

confidence: 99%

Riprap Scour Protection for Monopiles in Offshore Wind Farms

Esteban

Gutiérrez

Negro

et al. 2019

JMSE

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The scour phenomenon is critical for monopile structures in offshore wind farms. There are two possible strategies: allowing the development of scour holes around the monopile or avoiding it by placing scour protection. The last one is the most used up to now. This paper is focused on the determination of the weight of the stones forming the scour protection. There are some formulas for the design of these parameters, having a lot of uncertainties around them. Some of them were created for fluvial environment, with a different flow to the marine one. Other formulas were elaborated specifically for coastal structures, closer to the coast than offshore wind farms, and with dimensions completely different. This paper presents the analysis of three formulas: Isbash, corresponding to fluvial environment, and Soulsby, and De Vos, corresponding to marine environment. The results of the application of those formulas are compared with real data of scour protection systems showing good results in five offshore wind facilities in operation (Arklow Bank phase 1, Egmond aan Zee, Horns Rev phase 1, Princess Amalia, and Scroby Sands), giving conclusion about the uncertainties of the use of these formulas and recommendations for using them in offshore wind.

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“…During the tidal cycle the current velocity varies from zero (slack tide) to peak (ebb or flood depending on the direction), with the highest velocities usually measured at the surface. In extreme cases, vortex-induced vibration can cause high frequency loading to support structures and scouring [26] in addition to mooring lines or umbilical cables [20]. Complex loading may also occur in turbulent flows [13].…”

Section: Environmental Loadsmentioning

confidence: 99%

“…Spectral distribution of mooring line tensions for (a) line 1 and (b) line 2 measured between 21-26 September 2010 and 14-21 November 2010 (red and blue lines respectively).Spectra calculated from the surface elevation time-series are shown for the intervals[21][22][23][24][25][26] September 2010 (dark grey) and 14-21 November 2010 (light grey).…”

mentioning

confidence: 99%

Applicability of geotechnical approaches and constitutive models for foundation analysis of marine renewable energy arrays

Heath

Jensen

Weller

et al. 2017

Renewable and Sustainable Energy Reviews

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For Marine Renewable Energy (MRE) to become a viable alternative energy source, it must encompass large arrays of devices. Arrays may include 1000s of devices. The associated foundations or anchors may encounter a range of seafloor sediment types and geotechnical properties. Wave and tidal energy convertors induce unique loads on foundations and anchors that are different from other seafloor engineering applications. Thus, there is a need for a combination of advanced site analysis and performance assessment. Geotechnical engineering plays the vital role of ensuring that foundation and anchor systems perform successfully for MRE devices. Our paper reviews the unique frequency and magnitude of loading regimes experienced by MRE arrays. We examine potential loading conditions on the foundation-anchor systems. Loading regimes include environmental and system loads from single devices or arrays

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Edge scour at scour protections around offshore wind turbine foundations

Cited by 18 publications

References 0 publications

Numerical investigation of flow and scour around a vertical circular cylinder

Numerical investigation of flow and scour around a vertical circular cylinder

Riprap Scour Protection for Monopiles in Offshore Wind Farms

Applicability of geotechnical approaches and constitutive models for foundation analysis of marine renewable energy arrays

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