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TitleGeologic insights from multibeam bathymetry and seascape maps of the Bay of Fundy, Canada
AuthorShaw, J; Todd, B J; Li, M Z
SourceContinental Shelf Research vol. 83, 2014 p. 53-63,
Alt SeriesEarth Sciences Sector, Contribution Series 20130083
Mediapaper; on-line; digital
File formatpdf
ProvinceEastern offshore region
AreaBay of Fundy
Lat/Long WENS -67.5000 -64.5000 45.5000 44.2500
Subjectssurficial geology/geomorphology; marine geology; seafloor topography; seabottom topography; bathymetry; glaciation; glacial landforms; glacial deposits; ice retreat; ice flow; Cenozoic; Quaternary
ProgramRenewable Energies, Environmental Geoscience
AbstractThe macrotidal Bay of Fundy, Canada, was systematically mapped in the early 2000s using multibeam sonar technology, partly to support efforts to develop hydropower. The primary product was a suite of 1:50,000-scale maps of shaded seafloor relief and backscatter. In addition, a 'seascape' map was produced in an attempt to classify the entire bay in terms of morphology, texture, and biota. The eight seascape groups that are delineated reflect the strong signature of glaciation in much of the bay, the effects of Holocene tidal range expansion, and the results of modern processes under a dynamic current regime. As a result of the recent mapping we are able to argue that the muddy depocentre in the southwest of the bay was primarily active before the well-documented expansion of tidal range that occurred in the Bay of Fundy in the Holocene epoch. We further demonstrate the complexity of the seafloor in one of the glacial seascapes, and discuss the morphology and stability of a major tidal scour. The evidence obtained from multibeam sonar mapping reveals the complexity of the sea floor in the Bay of Fundy not necessarily apparent on the 1977 surficial geology map based on sparse lines of single-beam echo sounder data.
Summary(Plain Language Summary, not published)
This paper summarises mapping of the Bay of Fundy by the Geological Survey of Canada (GSC). It demonstrates how earlier approaches have been superseded by new approaches using multibeam sonar. It provides users with information on GSC map products and demonstrates the complexity of the sea floor in a region subject to possible development of tidal power.