Details
| Original language | English |
|---|---|
| Article number | 1651 |
| Number of pages | 22 |
| Journal | Water (Switzerland) |
| Volume | 12 |
| Issue number | 6 |
| Publication status | Published - 9 Jun 2020 |
Abstract
This research advances the understanding of jacket-type platform induced local and global erosion and deposition processes for combined wave-current conditions. To this end, a laboratory study was carried out comparing the equilibrium scour depth for two structural designs that are differentiated in the geometrical distance of the structure's lowest node to the seabed. Measurements of local scour depths over time have been conducted with echo sounding transducers. An empirical approach is proposed to predict the final scour depths as a function of the node distance to the seabed. Additionally, 3D laser scans have been performed to obtain the digital elevation model of the surrounding sediment bed. Novel methodologies were developed to describe and easily compare the relative volume change of the sediment bed per surface area due to structure-seabed interaction, enabling spatial analyses of highly complex erosion and deposition patterns. The seabed sediment mobility around the structure is found to be highly sensitive to a change in node distance. The decrease of the node distance results in a higher erosion depth of sediment underneath the structure of up to 26%, especially for current-dominated conditions, as well as an increased deposition of sediment downstream of the structure over a distance of up to 6.5 times the footprint length. The results of this study highlight the requirement to consider the interaction of the structure with the surrounding seabed within the design process of offshore structures, to mitigate potential impacts on the marine environment stemming from the extensive sediment displacement and increased sediment mobility.
ASJC Scopus subject areas
- Biochemistry, Genetics and Molecular Biology(all)
- Biochemistry
- Social Sciences(all)
- Geography, Planning and Development
- Agricultural and Biological Sciences(all)
- Aquatic Science
- Environmental Science(all)
- Water Science and Technology
Sustainable Development Goals
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In: Water (Switzerland), Vol. 12, No. 6, 1651, 09.06.2020.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Influence of Structural Elements on the Spatial Sediment Displacement around a Jacket-Type Offshore Foundation
AU - Welzel, Mario
AU - Schendel, Alexander
AU - Goseberg, Nils
AU - Hildebrandt, Arndt
AU - Schlurmann, Torsten
N1 - Funding text 1: Funding: The present study is part of the research project “HyConCast—Hybrid substructure of high strength concrete and ductile iron castings for offshore wind turbines” (BMWI: 0325651A), as well as of the project “marTech-Testing and development of maritime technologies for reliable power supply” (BMWI: 0324196A, 0324196B). The authors gratefully acknowledge the support of the German Federal Ministry for Economic Affairs and Energy within the funded project.
PY - 2020/6/9
Y1 - 2020/6/9
N2 - This research advances the understanding of jacket-type platform induced local and global erosion and deposition processes for combined wave-current conditions. To this end, a laboratory study was carried out comparing the equilibrium scour depth for two structural designs that are differentiated in the geometrical distance of the structure's lowest node to the seabed. Measurements of local scour depths over time have been conducted with echo sounding transducers. An empirical approach is proposed to predict the final scour depths as a function of the node distance to the seabed. Additionally, 3D laser scans have been performed to obtain the digital elevation model of the surrounding sediment bed. Novel methodologies were developed to describe and easily compare the relative volume change of the sediment bed per surface area due to structure-seabed interaction, enabling spatial analyses of highly complex erosion and deposition patterns. The seabed sediment mobility around the structure is found to be highly sensitive to a change in node distance. The decrease of the node distance results in a higher erosion depth of sediment underneath the structure of up to 26%, especially for current-dominated conditions, as well as an increased deposition of sediment downstream of the structure over a distance of up to 6.5 times the footprint length. The results of this study highlight the requirement to consider the interaction of the structure with the surrounding seabed within the design process of offshore structures, to mitigate potential impacts on the marine environment stemming from the extensive sediment displacement and increased sediment mobility.
AB - This research advances the understanding of jacket-type platform induced local and global erosion and deposition processes for combined wave-current conditions. To this end, a laboratory study was carried out comparing the equilibrium scour depth for two structural designs that are differentiated in the geometrical distance of the structure's lowest node to the seabed. Measurements of local scour depths over time have been conducted with echo sounding transducers. An empirical approach is proposed to predict the final scour depths as a function of the node distance to the seabed. Additionally, 3D laser scans have been performed to obtain the digital elevation model of the surrounding sediment bed. Novel methodologies were developed to describe and easily compare the relative volume change of the sediment bed per surface area due to structure-seabed interaction, enabling spatial analyses of highly complex erosion and deposition patterns. The seabed sediment mobility around the structure is found to be highly sensitive to a change in node distance. The decrease of the node distance results in a higher erosion depth of sediment underneath the structure of up to 26%, especially for current-dominated conditions, as well as an increased deposition of sediment downstream of the structure over a distance of up to 6.5 times the footprint length. The results of this study highlight the requirement to consider the interaction of the structure with the surrounding seabed within the design process of offshore structures, to mitigate potential impacts on the marine environment stemming from the extensive sediment displacement and increased sediment mobility.
KW - Deposition patterns
KW - Environmental impact
KW - Erosion patterns
KW - Laboratory tests
KW - Marine environment
KW - Offshore foundation
KW - Scour
KW - Sediment transport
KW - Wave-current interaction
KW - Deposition
KW - Erosion
KW - Offshore oil well production
KW - Offshore structures
KW - Structural design
KW - Combined wave current
KW - Digital elevation model
KW - Erosion and deposition
KW - Geometrical distances
KW - Laboratory studies
KW - Seabed interaction
KW - Structural elements
KW - Sediments
KW - digital elevation model
KW - displacement
KW - echo sounding
KW - marine environment
KW - scour
KW - seafloor
KW - sediment transport
UR - http://www.scopus.com/inward/record.url?scp=85087544813&partnerID=8YFLogxK
U2 - 10.3390/w12061651
DO - 10.3390/w12061651
M3 - Article
AN - SCOPUS:85087544813
VL - 12
JO - Water (Switzerland)
JF - Water (Switzerland)
SN - 2073-4441
IS - 6
M1 - 1651
ER -