Details
| Originalsprache | Englisch |
|---|---|
| Aufsatznummer | 103515 |
| Fachzeitschrift | Coastal engineering |
| Jahrgang | 152 |
| Frühes Online-Datum | 18 Juni 2019 |
| Publikationsstatus | Veröffentlicht - Okt. 2019 |
Abstract
This paper presents the results of an experimental study on the scour development of a hydraulic-transparent offshore foundation exposed to combined waves and current. Irregular waves propagating perpendicular to a current were simulated in a wave-current basin. The physical model tests were conducted in a length scale of 1:30 while measurements of the scour development over time were achieved by echo sounding devices placed at several locations at the upstream and downstream side of the jacket structure. Insights were gained on the scour development and time scale of the scouring process around a complex jacket structure for different wave-current conditions. The results were presented with respect to the Keulegan-Carpenter KC number and the relative wave-current velocity. Wave conditions were adjusted so that KC numbers between 6.7 and 23.4 could be tested in a systematic wave-current test program with tests reaching from wave dominated conditions up to current dominated conditions. Measured scour depths were critically assessed by an extrapolation to expected equilibrium scour depths. With respect to the current flow direction, the experiments showed generally larger scour depths at the upstream side and lower scour depths on the downstream side for each pile of the jacket structure. The development of global scour around the structure intensified with increasing relative wave-current velocity. As a result, a practical formulation is proposed for the reliable prediction of local scour depths around a jacket foundation in combined wave-current conditions. Finally, dimensionless time scales and observed as well as predicted scour depths are compared to values for the scour development around monopiles.
Schlagwörter
- Hydrodynamic transparent, Jacket, Laboratory tests, Scour, Sediment transport, Wave-current interaction, Offshore oil well production, Piles, Software testing, Combined wave current, Laboratory test, Local scour depths, Offshore foundation, Physical model test, Wave current interaction, Waves and currents, comparative study, current direction, erosion rate, fixed offshore structure, foundation, hydrodynamics, pile response, scour, sediment transport, soil-structure interaction, wave propagation, wave-current interaction, wave-structure interaction
ASJC Scopus Sachgebiete
- Ingenieurwesen (insg.)
- Meerestechnik
- Umweltwissenschaften (insg.)
- Environmental engineering
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in: Coastal engineering, Jahrgang 152, 103515, 10.2019.
Publikation: Beitrag in Fachzeitschrift › Artikel › Forschung › Peer-Review
}
TY - JOUR
T1 - Scour development around a jacket structure in combined waves and current conditions compared to monopile foundations
AU - Welzel, M.
AU - Schendel, A.
AU - Hildebrandt, A.
AU - Schlurmann, T.
N1 - Funding Information: The authors gratefully acknowledge the support of the German Federal Ministry for Economic Affairs and Energy within the funded project “HyConCast – Hybrid substructure of high strength concrete and ductile iron castings for offshore wind turbines” (BMWI: 0325651A). Furthermore, the authors thank T. Kreklow, O. Fink, N. Ommen and L. Evers for their support in conducting the laboratory experiments.
PY - 2019/10
Y1 - 2019/10
N2 - This paper presents the results of an experimental study on the scour development of a hydraulic-transparent offshore foundation exposed to combined waves and current. Irregular waves propagating perpendicular to a current were simulated in a wave-current basin. The physical model tests were conducted in a length scale of 1:30 while measurements of the scour development over time were achieved by echo sounding devices placed at several locations at the upstream and downstream side of the jacket structure. Insights were gained on the scour development and time scale of the scouring process around a complex jacket structure for different wave-current conditions. The results were presented with respect to the Keulegan-Carpenter KC number and the relative wave-current velocity. Wave conditions were adjusted so that KC numbers between 6.7 and 23.4 could be tested in a systematic wave-current test program with tests reaching from wave dominated conditions up to current dominated conditions. Measured scour depths were critically assessed by an extrapolation to expected equilibrium scour depths. With respect to the current flow direction, the experiments showed generally larger scour depths at the upstream side and lower scour depths on the downstream side for each pile of the jacket structure. The development of global scour around the structure intensified with increasing relative wave-current velocity. As a result, a practical formulation is proposed for the reliable prediction of local scour depths around a jacket foundation in combined wave-current conditions. Finally, dimensionless time scales and observed as well as predicted scour depths are compared to values for the scour development around monopiles.
AB - This paper presents the results of an experimental study on the scour development of a hydraulic-transparent offshore foundation exposed to combined waves and current. Irregular waves propagating perpendicular to a current were simulated in a wave-current basin. The physical model tests were conducted in a length scale of 1:30 while measurements of the scour development over time were achieved by echo sounding devices placed at several locations at the upstream and downstream side of the jacket structure. Insights were gained on the scour development and time scale of the scouring process around a complex jacket structure for different wave-current conditions. The results were presented with respect to the Keulegan-Carpenter KC number and the relative wave-current velocity. Wave conditions were adjusted so that KC numbers between 6.7 and 23.4 could be tested in a systematic wave-current test program with tests reaching from wave dominated conditions up to current dominated conditions. Measured scour depths were critically assessed by an extrapolation to expected equilibrium scour depths. With respect to the current flow direction, the experiments showed generally larger scour depths at the upstream side and lower scour depths on the downstream side for each pile of the jacket structure. The development of global scour around the structure intensified with increasing relative wave-current velocity. As a result, a practical formulation is proposed for the reliable prediction of local scour depths around a jacket foundation in combined wave-current conditions. Finally, dimensionless time scales and observed as well as predicted scour depths are compared to values for the scour development around monopiles.
KW - Hydrodynamic transparent
KW - Jacket
KW - Laboratory tests
KW - Scour
KW - Sediment transport
KW - Wave-current interaction
KW - Offshore oil well production
KW - Piles
KW - Software testing
KW - Combined wave current
KW - Laboratory test
KW - Local scour depths
KW - Offshore foundation
KW - Physical model test
KW - Wave current interaction
KW - Waves and currents
KW - comparative study
KW - current direction
KW - erosion rate
KW - fixed offshore structure
KW - foundation
KW - hydrodynamics
KW - pile response
KW - scour
KW - sediment transport
KW - soil-structure interaction
KW - wave propagation
KW - wave-current interaction
KW - wave-structure interaction
KW - Hydrodynamic transparent
KW - Jacket
KW - Laboratory tests
KW - Scour
KW - Sediment transport
KW - Wave-current interaction
UR - http://www.scopus.com/inward/record.url?scp=85068450526&partnerID=8YFLogxK
U2 - 10.1016/j.coastaleng.2019.103515
DO - 10.1016/j.coastaleng.2019.103515
M3 - Article
VL - 152
JO - Coastal engineering
JF - Coastal engineering
SN - 0378-3839
M1 - 103515
ER -