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TitleRole of a submarine bank in the long-term evolution of the northeast coast of Prince Edward Island, Canada
AuthorShaw, J; Duffy, G; Taylor, R B; Chassé, J; Frobel, D
SourceJournal of Coastal Research vol. 24, no. 5, 2008 p. 1249-1259,
Alt SeriesEarth Sciences Sector, Contribution Series 20070028
PublisherCoastal Education and Research Foundation
Mediapaper; on-line; digital
File formatpdf
ProvincePrince Edward Island; Eastern offshore region
NTS11L/08; 11L/09
AreaMilne Bank; East Point
Lat/Long WENS-62.1667 -61.8333 46.5000 46.3333
Subjectsmarine geology; submarine features; coastal environment; coastal studies; coastal erosion; sediment transport; submarine transport; tidal currents; tidal environments; tidal deposits
Illustrationslocation maps; photographs; images
ProgramGeoscience for Oceans Management
Released2008 09 01
AbstractIn order to understand regional variations in coastal behavior on Prince Edward Island, Canada, we investigated the role of Milne Bank, a submarine bank at East Point, the eastern tip of the island. The objective was to determine how the bank might facilitate transfer sediment from the eroding north coast to the adjacent sediment-rich south coast. The study utilized grain-size and seismic data collected on Milne Bank in 1989 and multibeam sonar surveys in 1997 and 1999. The disturbing effect of East Point on the hydrodynamic regime controls sediment transport. The northern boundary of the bank is a steep sand wave located where southward tidal and wave-driven currents rounding East Point suddenly decelerate. Sand from the north coast enters Milne Bank and is carried south in a field of migrating sand waves that are shed from the northern bounding sand wave toward the prograding end of the bank. Milne Bank is a major sediment sink, rather than a link between the eroding north coast and the sediment-rich southfacing coast. Longshore transport in nearshore bars is more likely to be responsible for continued sediment accumulation on the south coast. Embayments on the south coast have filled up in a cascading fashion, each one facilitating sediment bypassing when it has reached full capacity.

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