|Titre||Discovering the seafloor of the Bay of Fundy|
|Auteur||Todd, B J; Shaw, J|
|Source||FERN, Fundy Energy Research Network Bi-Annual Newsletter 2011, no. 1, 2011 p. 12|
|Liens||Online - En ligne |
|Liens||Discovering the seafloor of the Bay of Fundy
|Séries alt.||Secteur des sciences de la Terre, Contribution externe 20110148|
|Document||publication en série|
|Province||Région extracotière de l'est|
|Lat/Long OENS|| -67.5000 -64.5000 45.5000 44.2500|
|Sujets||topographie du fond océanique; topographie du fond océanique; énergie marémotrice; courants de marée; dépôts glaciomarins; tills; bathymétrie; géophysique; géologie marine; géologie des dépôts
meubles/géomorphologie; Cénozoïque; Quaternaire|
|Programme||Énergie renouvelable offshore, Géoscience en mer|
|Résumé||(disponible en anglais seulement)|
The Bay of Fundy has tidal power potential but a better understanding of the bay¿s underwater geology is needed to identify safe and suitable turbine locations.
The Geological Survey of Canada (Atlantic) of Natural Resources Canada has responded to this need by mapping the Bay of Fundy seabed, and by providing topographic and geological maps and knowledge. This information will help guide development of
GSC researchers collaborated with the Canadian Hydrographic Service (Fisheries and Oceans Canada), the Ocean Mapping Group of the University of New Brunswick, and the Centre of Geographic Sciences of the Nova Scotia Community College
to map the topography and geology of the ocean bottom and the character and thickness of seabed sediments. This was achieved using a suite of sophisticated survey tools and techniques, including shipboard and aircraft-based devices. Multibeam sonar
(SOund Navigation And Ranging) data collected by ships were used to construct an accurate relief map of the Bay of Fundy seabed (Figure 1). Aircraft-mounted LiDAR (Light Detection And Ranging) flown during periods of low tide collected data that
enabled accurate mapping of the coastal zone. The combination of the multibeam sonar and LiDAR results provided the first detailed and ¿seamless¿ map from the bottom of the Bay of Fundy across the shoreline and onto land (Figure 2).
Once the ocean
bottom topography was mapped, seismic profiling techniques were used to determine the types of rock and sediment that lay beneath the seafloor. Sound energy was used once more, this time to produce echoes from layers of sediment up to 50 m beneath
the seabed. The result was a series of sub-surface profiles of sediment thickness produced as the survey ship completed transects of the bay (Figure 3).