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TitleBackscatter strength and shaded seafloor relief, Lunenburg Bay, Scotian Shelf, offshore Nova Scotia
LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorKing, E L; Beaver, D
SourceGeological Survey of Canada, Open File 8176, 2017, 1 sheet, Open Access logo Open Access
PublisherNatural Resources Canada
PublisherCanadian Hydrographic Service
Documentopen file
Maps1 map
Map Info.geophysical, backscatter strength/seafloor relief, 1:25,000
ProjectionUniversal Transverse Mercator Projection, UTM zone 20T (NAD83)
Mediaon-line; digital
RelatedThis publication is related to the following publications
File formatpdf
ProvinceEastern offshore region; Nova Scotia
AreaScotian Shelf; Lunenburg Bay
Lat/Long WENS -64.3333 -64.1250 44.3833 44.2583
Subjectsgeophysics; marine geology; surficial geology/geomorphology; bathymetry; seafloor topography; bedrock topography; bedforms; megaripples; sand waves; marine sediments; muds; sands; gravels; glaciomarine deposits; tills; glacial features; drumlins; glacial deposits; grab samples; core samples; grain size analyses; geophysical surveys; magnetic surveys, marine; magnetometer surveys; acoustic surveys, marine; sonar surveys; side-scan sonar; oceanography; meteorology; modelling; currents; sediment dispersal; erosion; mineral deposits; placer deposits; gold; Phanerozoic; Cenozoic; Quaternary
Illustrationslocation maps; index maps; ternary diagrams; models
ProgramPublic Safety Geoscience Marine Geohazards
Released2017 04 12
Summary(Plain Language Summary, not published)
This illustrated map depicts acoustic backscatter strength, in shaded relief view, part of a three-map series of Lunenburg Bay at a scale of 1:25 000. Backscatter is derived from 2004-06 sonar surveys and displayed as a blue (coarse) and beige (finer) colour spectrum. Sample, grainsize and geophysical control is summarized in a map insert as is a summary of the bay's oceanographic conditions. Although there is no simple relationship between backscatter amplitude and surficial sediment type, together with grainsize, it is the primary guide for mapping seabed sediment type. Bedrock and bedrock with gravel cover is abundant while sand is common in bedrock crevices. Sand and mud is common the central mid-bay and the more energy-sheltered innermost bay. Tidal currents dominate at the head of the bay but wind, waves and associated currents, paralleling the coastline, are capable of sand transport, sometimes in small dunes. Coastal erosion contributes to harbour-filling muds, but storms also flush sediment to deeper waters.

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