GEOSCAN, résultats de la recherche

Menu GEOSCAN


TitrePreliminary results from multibeam bathymetry and LiDAR surveys in 2007 of the Bay of Fundy, Canada
AuteurParrott, D R; Todd, B J; Hughes Clarke, J E; Griffin, J; Webster, T
SourceAtlantic Geoscience Society Abstracts: 2008 Colloquium & Annual General Meeting; Atlantic Geology vol. 44, 2008 p. 32
Année2008
Séries alt.Secteur des sciences de la Terre, Contribution externe 20080534
RéunionAtlantic Geoscience Society 34th Colloquium and Annual General Meeting; Dartmouth, NS; CA; février 1-2, 2008
Documentpublication en série
Lang.anglais
Mediapapier
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)
In 2006, the Geological Survey of Canada (GSC), in conjunction with Canadian Hydrographic Service (CHS) and several universities, commenced a three year program to map the Bay of Fundy on the east coast of Canada. The Bay of Fundy has the largest recorded tides in the world, with a maximum range of about 17 metres at the head of the bay. Tidal current velocities that exceed 4.5 m/s in restricted narrow passages at various points in the bay could be harnessed for electrical power generation. To date about 10,000 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 seafloor. Additional bathymetry and sub-bottom profiler data will be collected in 2008. CHS will use the data for improved navigation charts and GSC will integrate information from geophysical surveys, seafloor samples, photographs, and video transects to produce surficial geology and benthic habitat maps. The resulting 1: 50,000-scale maps will be released as part of a new Canadian national marine map series. Current meter and suspended sediment sensor data and time lapse photographs will be used to provide information on seafloor properties, nearbed hydrodynamics and sediment transport processes. These data, in conjunction with the improved bathymetry data, will be used to assess the accuracy of tide and current prediction models. The broad intertidal zone in the Bay of Fundy presents a challenge to collection of marine geophysical and bathymetry data. Traditionally, this area has not been surveyed due to the significant time requirements and inherent danger involved in operating vessels in coastal areas that dry between tides. However, these large drying areas were surveyed using airborne terrestrial laser (LiDAR), providing an opportunity to generate a continuous map of the marine, intertidal and terrestrial areas. The data were collected during an extreme low tide to provide detailed elevation measurements of the inter-tidal areas. Multibeam bathymetry data will be collected during high tides to provide a seamless digital elevation model across the intertidal zone. The presentation will focus on the status of the project after the first two years of data collection, challenges and future plans of the project as well as a summary of the most recent data collection and interpretation from the project.
GEOSCAN ID226178