Details
| Original language | English |
|---|---|
| Article number | 117042 |
| Number of pages | 14 |
| Journal | Ocean engineering |
| Volume | 298 |
| Early online date | 22 Feb 2024 |
| Publication status | Published - 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.
Keywords
- Erosion patterns, Jacket, Laboratory tests, Scour, Sediment transport
ASJC Scopus subject areas
- Environmental Science(all)
- Environmental Engineering
- Engineering(all)
- Ocean Engineering
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In: Ocean engineering, Vol. 298, 117042, 15.04.2024.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Spatio-temporal analysis of scour around complex offshore foundations under clear water and live bed conditions
AU - Welzel, Mario
AU - Schendel, Alexander
AU - Satari, Ramish
AU - Neuweiler, Insa
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).
PY - 2024/4/15
Y1 - 2024/4/15
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
KW - Laboratory tests
KW - Scour
KW - Sediment transport
UR - http://www.scopus.com/inward/record.url?scp=85185536258&partnerID=8YFLogxK
U2 - 10.1016/j.oceaneng.2024.117042
DO - 10.1016/j.oceaneng.2024.117042
M3 - Article
AN - SCOPUS:85185536258
VL - 298
JO - Ocean engineering
JF - Ocean engineering
SN - 0029-8018
M1 - 117042
ER -