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Influence of Structural Elements on the Spatial Sediment Displacement around a Jacket-Type Offshore Foundation

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Leichtweiß-Institute for Hydraulic Engineering and Water Resources, Technische Universität Braunschweig, 38106 Braunschweig, Germany
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Ludwig-Franzius-Institute for Hydraulic Estuarine and Coastal Engineering, Leibniz Universität Hannover, 30167 Hannover, Germany
*
Author to whom correspondence should be addressed.
Water 2020, 12(6), 1651; https://doi.org/10.3390/w12061651
Received: 5 May 2020 / Revised: 2 June 2020 / Accepted: 5 June 2020 / Published: 9 June 2020
(This article belongs to the Section Water Erosion and Sediment Transport)
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. View Full-Text
Keywords: scour; wave–current interaction; erosion patterns; sediment transport; deposition patterns; environmental impact; laboratory tests; offshore foundation; marine environment scour; wave–current interaction; erosion patterns; sediment transport; deposition patterns; environmental impact; laboratory tests; offshore foundation; marine environment
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Welzel, M.; Schendel, A.; Goseberg, N.; Hildebrandt, A.; Schlurmann, T. Influence of Structural Elements on the Spatial Sediment Displacement around a Jacket-Type Offshore Foundation. Water 2020, 12, 1651.

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