Spatio-temporal analysis of scour around complex offshore foundations under clear water and live bed conditions

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OriginalspracheEnglisch
Aufsatznummer117042
Seitenumfang14
FachzeitschriftOcean engineering
Jahrgang298
Frühes Online-Datum22 Feb. 2024
PublikationsstatusVeröffentlicht - 15 Apr. 2024

Abstract

This study investigates scour around offshore wind foundations, focusing on two complex structures with varying degrees of flow blockage: a novel hybrid gravity-based jacket (structure “A") and a conventional four-legged jacket (structure “B"). As offshore structures like jackets become more prevalent, mainly due to their structural stability and growth of offshore wind energy in general, understanding scouring phenomena around complex structures is crucial. Laboratory tests under steady flow clear-water and live-bed conditions, with measurements of 3D laser scans for test durations of 15, 90, and 420 min were conducted. In addition the scour development over time was measured and analyzed with eight echo sounders. The findings confirm that scouring around complex structures displays significant variability in dependency of the structure type, making standardization a challenging task. However, some common trends can be derived. Under live-bed conditions, both types of structures exhibit global erosion, regardless of the complexity or flow obstruction of the structure. The spatial erosion depth, relative to the footprint, is markedly higher (2.5 times) for the gravity-based structure as opposed to the jacket structure. In clear-water conditions, no global scour was observed for both structures and a very similar spatial erosion depth was reached after 420 min.

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Spatio-temporal analysis of scour around complex offshore foundations under clear water and live bed conditions. / Welzel, Mario; Schendel, Alexander; Satari, Ramish et al.
in: Ocean engineering, Jahrgang 298, 117042, 15.04.2024.

Publikation: Beitrag in FachzeitschriftArtikelForschungPeer-Review

Welzel M, Schendel A, Satari R, Neuweiler I, Schlurmann T. Spatio-temporal analysis of scour around complex offshore foundations under clear water and live bed conditions. Ocean engineering. 2024 Apr 15;298:117042. Epub 2024 Feb 22. doi: 10.1016/j.oceaneng.2024.117042
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abstract = "This study investigates scour around offshore wind foundations, focusing on two complex structures with varying degrees of flow blockage: a novel hybrid gravity-based jacket (structure “A{"}) and a conventional four-legged jacket (structure “B{"}). As offshore structures like jackets become more prevalent, mainly due to their structural stability and growth of offshore wind energy in general, understanding scouring phenomena around complex structures is crucial. Laboratory tests under steady flow clear-water and live-bed conditions, with measurements of 3D laser scans for test durations of 15, 90, and 420 min were conducted. In addition the scour development over time was measured and analyzed with eight echo sounders. The findings confirm that scouring around complex structures displays significant variability in dependency of the structure type, making standardization a challenging task. However, some common trends can be derived. Under live-bed conditions, both types of structures exhibit global erosion, regardless of the complexity or flow obstruction of the structure. The spatial erosion depth, relative to the footprint, is markedly higher (2.5 times) for the gravity-based structure as opposed to the jacket structure. In clear-water conditions, no global scour was observed for both structures and a very similar spatial erosion depth was reached after 420 min.",
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note = "Funding Information: This study has been carried out within the Collaborative Research Center (CRC) 1463 “Integrated design and operation methodology for offshore megastructures” and is funded by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) – SFB 1463–434502799. As well as within the project TEXBASE (KF 3316902Kl4) which was funded by the ZIM program “Zentrales Innovationsprogramm Mittelstand” which is a funding programme of the BMWK (Federal Ministry for Economic Affairs and Climate Action). ",
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AU - Schlurmann, Torsten

N1 - Funding Information: This study has been carried out within the Collaborative Research Center (CRC) 1463 “Integrated design and operation methodology for offshore megastructures” and is funded by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) – SFB 1463–434502799. As well as within the project TEXBASE (KF 3316902Kl4) which was funded by the ZIM program “Zentrales Innovationsprogramm Mittelstand” which is a funding programme of the BMWK (Federal Ministry for Economic Affairs and Climate Action).

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N2 - This study investigates scour around offshore wind foundations, focusing on two complex structures with varying degrees of flow blockage: a novel hybrid gravity-based jacket (structure “A") and a conventional four-legged jacket (structure “B"). As offshore structures like jackets become more prevalent, mainly due to their structural stability and growth of offshore wind energy in general, understanding scouring phenomena around complex structures is crucial. Laboratory tests under steady flow clear-water and live-bed conditions, with measurements of 3D laser scans for test durations of 15, 90, and 420 min were conducted. In addition the scour development over time was measured and analyzed with eight echo sounders. The findings confirm that scouring around complex structures displays significant variability in dependency of the structure type, making standardization a challenging task. However, some common trends can be derived. Under live-bed conditions, both types of structures exhibit global erosion, regardless of the complexity or flow obstruction of the structure. The spatial erosion depth, relative to the footprint, is markedly higher (2.5 times) for the gravity-based structure as opposed to the jacket structure. In clear-water conditions, no global scour was observed for both structures and a very similar spatial erosion depth was reached after 420 min.

AB - This study investigates scour around offshore wind foundations, focusing on two complex structures with varying degrees of flow blockage: a novel hybrid gravity-based jacket (structure “A") and a conventional four-legged jacket (structure “B"). As offshore structures like jackets become more prevalent, mainly due to their structural stability and growth of offshore wind energy in general, understanding scouring phenomena around complex structures is crucial. Laboratory tests under steady flow clear-water and live-bed conditions, with measurements of 3D laser scans for test durations of 15, 90, and 420 min were conducted. In addition the scour development over time was measured and analyzed with eight echo sounders. The findings confirm that scouring around complex structures displays significant variability in dependency of the structure type, making standardization a challenging task. However, some common trends can be derived. Under live-bed conditions, both types of structures exhibit global erosion, regardless of the complexity or flow obstruction of the structure. The spatial erosion depth, relative to the footprint, is markedly higher (2.5 times) for the gravity-based structure as opposed to the jacket structure. In clear-water conditions, no global scour was observed for both structures and a very similar spatial erosion depth was reached after 420 min.

KW - Erosion patterns

KW - Jacket

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