Subsea cable stability on rocky seabeds - Comparison of field observations against conventional and novel design methods
As offshore renewable energy projects progress from concept demonstration to commercial-scale developments there is a need for improved approaches beyond conventional cable engineering design methods that have evolved from larger diameter pipelines for the oil and gas industry. New approaches are ne...
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ftsouthampton:oai:eprints.soton.ac.uk:422785 2023-07-30T04:00:00+02:00 Subsea cable stability on rocky seabeds - Comparison of field observations against conventional and novel design methods Draper, Scott Tong, Feifei Fogliani, Antonino White, David Johnson, Fraser Coles, Daniel Ingham, Stephen Lourie, Caroline 2018 text https://eprints.soton.ac.uk/422785/ https://eprints.soton.ac.uk/422785/1/13_Griffiths_et_al_2018_OMAE2018_77130_002_.pdf en English eng American Society Of Mechanical Engineers (ASME) https://eprints.soton.ac.uk/422785/1/13_Griffiths_et_al_2018_OMAE2018_77130_002_.pdf Draper, Scott, Tong, Feifei, Fogliani, Antonino, White, David, Johnson, Fraser, Coles, Daniel, Ingham, Stephen and Lourie, Caroline (2018) Subsea cable stability on rocky seabeds - Comparison of field observations against conventional and novel design methods. In Proceedings of the ASME 2018 37th International Conference on Ocean, Offshore and Arctic Engineering. vol. 5, American Society Of Mechanical Engineers (ASME). V005T04A043 . (doi:10.1115/OMAE2018-77130 <http://dx.doi.org/10.1115/OMAE2018-77130>). Conference or Workshop Item PeerReviewed 2018 ftsouthampton https://doi.org/10.1115/OMAE2018-77130 2023-07-09T22:24:04Z As offshore renewable energy projects progress from concept demonstration to commercial-scale developments there is a need for improved approaches beyond conventional cable engineering design methods that have evolved from larger diameter pipelines for the oil and gas industry. New approaches are needed to capture the relevant physics for small diameter cables on rocky seabeds to reduce the costs and risks of power transmission and increase operational reliability. This paper reports on subsea cables that MeyGen installed for Phase 1a of the Pentland Firth Inner Sound tidal stream energy project. These cables are located on rocky seabeds in an area where severe metocean conditions occur. ROV field observation of these cables shows them to be stable on the seabed with little or no movement occurring over almost all of the cable routes, despite conventional engineering methods predicting significant dynamic movement. We cite recent research undertaken by the University of Western Australia (UWA) to more accurately assess the hydrodynamic forces and geotechnical interaction of cables on rocky seabeds. We quantify the conformity between the cables and the undulating rocky seabed, and the distributions of cable seabed contact and spanning via simulations of the centimetric scale seabed bathymetry. This analysis leads to calculated profiles of lift, drag and seabed friction along the cable, which show that all of these load and reaction components are modelled in an over-conservative way by conventional pipeline engineering techniques. Overall, our analysis highlights that current cable stability design can be unnecessarily conservative on rocky seabeds. Our work foreshadows a new design approach that offers more efficient cable design to reduce project capex and enhance through-life integrity management. Conference Object Arctic University of Southampton: e-Prints Soton Volume 5: Pipelines, Risers, and Subsea Systems |
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University of Southampton: e-Prints Soton |
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ftsouthampton |
language |
English |
description |
As offshore renewable energy projects progress from concept demonstration to commercial-scale developments there is a need for improved approaches beyond conventional cable engineering design methods that have evolved from larger diameter pipelines for the oil and gas industry. New approaches are needed to capture the relevant physics for small diameter cables on rocky seabeds to reduce the costs and risks of power transmission and increase operational reliability. This paper reports on subsea cables that MeyGen installed for Phase 1a of the Pentland Firth Inner Sound tidal stream energy project. These cables are located on rocky seabeds in an area where severe metocean conditions occur. ROV field observation of these cables shows them to be stable on the seabed with little or no movement occurring over almost all of the cable routes, despite conventional engineering methods predicting significant dynamic movement. We cite recent research undertaken by the University of Western Australia (UWA) to more accurately assess the hydrodynamic forces and geotechnical interaction of cables on rocky seabeds. We quantify the conformity between the cables and the undulating rocky seabed, and the distributions of cable seabed contact and spanning via simulations of the centimetric scale seabed bathymetry. This analysis leads to calculated profiles of lift, drag and seabed friction along the cable, which show that all of these load and reaction components are modelled in an over-conservative way by conventional pipeline engineering techniques. Overall, our analysis highlights that current cable stability design can be unnecessarily conservative on rocky seabeds. Our work foreshadows a new design approach that offers more efficient cable design to reduce project capex and enhance through-life integrity management. |
format |
Conference Object |
author |
Draper, Scott Tong, Feifei Fogliani, Antonino White, David Johnson, Fraser Coles, Daniel Ingham, Stephen Lourie, Caroline |
spellingShingle |
Draper, Scott Tong, Feifei Fogliani, Antonino White, David Johnson, Fraser Coles, Daniel Ingham, Stephen Lourie, Caroline Subsea cable stability on rocky seabeds - Comparison of field observations against conventional and novel design methods |
author_facet |
Draper, Scott Tong, Feifei Fogliani, Antonino White, David Johnson, Fraser Coles, Daniel Ingham, Stephen Lourie, Caroline |
author_sort |
Draper, Scott |
title |
Subsea cable stability on rocky seabeds - Comparison of field observations against conventional and novel design methods |
title_short |
Subsea cable stability on rocky seabeds - Comparison of field observations against conventional and novel design methods |
title_full |
Subsea cable stability on rocky seabeds - Comparison of field observations against conventional and novel design methods |
title_fullStr |
Subsea cable stability on rocky seabeds - Comparison of field observations against conventional and novel design methods |
title_full_unstemmed |
Subsea cable stability on rocky seabeds - Comparison of field observations against conventional and novel design methods |
title_sort |
subsea cable stability on rocky seabeds - comparison of field observations against conventional and novel design methods |
publisher |
American Society Of Mechanical Engineers (ASME) |
publishDate |
2018 |
url |
https://eprints.soton.ac.uk/422785/ https://eprints.soton.ac.uk/422785/1/13_Griffiths_et_al_2018_OMAE2018_77130_002_.pdf |
genre |
Arctic |
genre_facet |
Arctic |
op_relation |
https://eprints.soton.ac.uk/422785/1/13_Griffiths_et_al_2018_OMAE2018_77130_002_.pdf Draper, Scott, Tong, Feifei, Fogliani, Antonino, White, David, Johnson, Fraser, Coles, Daniel, Ingham, Stephen and Lourie, Caroline (2018) Subsea cable stability on rocky seabeds - Comparison of field observations against conventional and novel design methods. In Proceedings of the ASME 2018 37th International Conference on Ocean, Offshore and Arctic Engineering. vol. 5, American Society Of Mechanical Engineers (ASME). V005T04A043 . (doi:10.1115/OMAE2018-77130 <http://dx.doi.org/10.1115/OMAE2018-77130>). |
op_doi |
https://doi.org/10.1115/OMAE2018-77130 |
container_title |
Volume 5: Pipelines, Risers, and Subsea Systems |
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1772810663228342272 |