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Design of Shallow Foundations for Tidal-Stream Energy Structures
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Tidal-stream (tidal) energy is a renewable form of energy produced by harnessing the kinetic energy of marine currents created by the rise and fall of the tides and converting it into electricity.

To-date, tidal energy development remains largely in the demonstration stage and the development community has not rallied behind any one foundation technology. The distinguishing challenge for tidal development is the required installation technique and the uncertainty surrounding their performance in environments where the seabed has been stripped of most of its sediment and the underlying bedrock is left exposed due to the high energy currents common to locations suitable for turbine deployment. Shallow foundations, or gravity-based structures (GBS), are one of the leading foundation solutions for tidal turbines because they can be easily installed in these demanding environments; however, like offshore wind turbines, tidal turbines are subjected to predominantly horizontal loads. This paper describes the results from a combined horizontal and vertical load test conducted on a novel footing geometry designed to maximize penetration into the seabed. An onshore test site was selected based upon geologic similarity to possible offshore developments. The results of this study outline the importance of achieving footing penetration during turbine installation.

Publication Summary

  • Geosyntec Authors: John Barrett
  • All Authors: John Barrett, Geosyntec Consultants; Kenneth Gavin, Delft University of Technology; Tom Doyle, Dublin Offshore Consultants
  • Title: The Deep Foundations Institute (DFI)
  • Event or Publication: Publication
  • Practice Areas: Specialty and Conventional Structural Foundations
  • Citation: John Barrett, P.E.; (Tennessee); Logan Brant, Ph.D., P.E.; Rodolfo Sancio, Ph.D., P.E., D.GE; and Ali Ebrahimi, P.E. (Texas) coauthored multiple papers for publication by the Deep Foundations Institute (DFI) for the 2021 International Symposium on Frontiers in Offshore Geotechnics.
  • Date: 2021
  • Publication Type: Journal Article