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TitleBedrock erosion in strong tidal streams, erosion points to hazards for tidal power installations
AuthorMitchell, N C; Todd, B J; Schmitt, T
SourceSea Technology vol. 2013, no. 4, 2013.
Year2013
Alt SeriesEarth Sciences Sector, Contribution Series 20120398
Documentserial
Lang.English
Mediapaper; on-line; digital
File formatpdf
Subjectsmarine geology; tides; tidal currents; tidal environments; tidal deposits; erosion; coastal erosion; coastal environment
Illustrationsimages; photographs; plots
ProgramRenewable Energies, Environmental Geoscience
LinksOnline - En ligne
AbstractThe successful design of robust tidal power facilities faces many challenges associated with corrosion by seawater, and impacts of waves and tidal currents. Whereas useful indications of material survival may be obtained from laboratory testing, geological studies of these areas have the promise of providing useful indirect knowledge. Multibeam echo-sounder data from three areas of extreme tidal streams has been examined: Minas Passage (Bay of Fundy, Canada), Nash Point (Bristol Channel, UK) and the Straits of Messina (Italy). Whereas the data from Nash Point and Messina show relatively limited erosion, those from the Minas Passage show potential undermining of rock outcrops. Surface currents in the Minas Passage reach 8 knots, indicating a possible threshold at which erosion just becomes significant. Foundations based on concrete may have limited design life in such areas.
GEOSCAN ID292224