GEOSCAN, résultats de la recherche


TitreMultibeam Bathymetry and LiDAR Surveys of the Bay of Fundy, Canada
AuteurParrott, D R; Todd, B J; Shaw, J; Kostylev, V; Hughes Clarke, J E; Griffin, J; Lamplugh, M; Webster, T
SourceFEMME 2009, abstracts volume; .
Séries alt.Secteur des sciences de la Terre, Contribution externe 20090335
RéunionFEMME 2009; Lisbon; PT; avril 21-24, 2009
Documentpublication en série
ProvinceRégion extracotière de l'est
Sujetslevés géophysiques; bathymétrie; topographie du fond océanique; topographie du fond océanique; milieu côtièr; études côtières; érosion côtière; géophysique; géologie marine; géologie des dépôts meubles/géomorphologie
Résumé(disponible en anglais seulement)
The Bay of Fundy has the largest recorded tides in the world, with a maximum range of about 17 metres. Tidal current velocities that exceed 4.5 m s-1 are currently being studied to determine the potential for in-stream tidal electrical power generation. In 2006, the Geological Survey of Canada, in conjunction with the Canadian Hydrographic Service and several universities, commenced a program to map the seabed of the Bay of Fundy on the east coast of Canada. About 12,500 km2 of multibeam bathymetry have been collected in the bay. Sub-bottom profiler data were collected simultaneously to provide information on the character and thickness of the sediments on the sea floor. Large intertidal areas were surveyed using airborne Light Detection and Ranging (LiDAR), providing an opportunity to generate a continuous map of the marine, intertidal and terrestrial areas. Information from geophysical surveys, seafloor samples, photographs and video transects is being integrated to produce surficial geology and benthic habitat maps.

Some key findings of the project are:
- Large glacial landforms may provide suitable habitats for fish and shellfish.
- Strong tidal currents are reworking sediments.
- Migration of large sand waves is observed in repetitive multibeam bathymetry surveys.
- Deep tidal-scour channels are present in several areas.
- The distribution and morphology of extensive horse mussel reefs have been mapped.