Research & Development
Project
STHYF
Seabed cable stability and hydrodynamics
- Duration: 34 months (2017-2019)
- Budget: €430K
Context
The development of tidal turbine arrays requires managing the costs of stabilising electric cables on the seabed in the presence of strong currents. Existing methodologies are suitable for sites where cable instability is mainly related to wave action. The very specific nature of strong currents found at tidal sites requires an adaptation of these methodologies taking into account turbulence in the currents combined with waves and chaotic bathymetry.
Objective
- To define a new prediction model for stability of cables laid on seabed at tidal sites
Main achievements
Review of knowledge on cable stability at tidal sites
Development of a modelling tool for a cable laid on the seabed
Development and qualification of a numerical model configured to reproduce hydrodynamic constraints on a section of cable
Proposal and application of a cable stability evaluation methodology
Specification, monitoring and analysis of tank tests to characterise the hydrodynamic constraints on a cable in a tidal environment
Main outputs
- Numerical tool: calculation model for the stability of a cable laid on the floor
- Database resulting from hydrodynamic tests in a basin: forces on a cable in different roughness conditions for the cable and the bottom
- Publication scientifique : Kuznetsov et al. (2018) Modification of a Wake model for hydrodynamic forces on submarine cables with a rough seabed. Proceedings from 20th EGU General Assembly (EGU2018), p.19847
Conclusion
STHYF has enabled the development of models to study the stability of cables in a tidal environment, whihch means on rocky ground and with high current speeds in the water column. These models have been integrated into software tools which are available to support the actors of the tidal sector in the design of future farms.
Partners
This project was led by EDF and France Energies Marines.
Funding
This project received French State funding managed by the National Research Agency under the Investments for the Future Programme (ANR-10-IEED-0006-20).
Accreditation
This project was certified by the maritime cluster Pôle Mer Bretagne Atlantique.
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