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TitleMonitoring and morphological expression of unconfined turbidity currents, Fraser River delta, Canada
AuthorHill, P; Lintern, G; Stacey, C
SourceFuture directions for research on submarine sediment flows: field workshop - 3rd circular; 2013 p. 2
Alt SeriesEarth Sciences Sector, Contribution Series 20130120
PublisherNational Oceanographic Centre
MeetingFuture Directions for Research on Submarine Sediment Flows: Field Workshop; Santa Sofia; IT; September 9-13, 2013
File formatpdf
ProvinceBritish Columbia
AreaFraser River Delta
Lat/Long WENS-123.5000 -123.0000 49.2500 49.0000
Subjectsmarine geology; geophysics; turbidity currents; bathymetry; sediment distribution; sediment transport; VENUS ocean observatory
ProgramMarine Geohazards, Public Safety Geoscience
AbstractThe VENUS ocean observatory has enabled the direct observation of an unconfined turbidity current at 100 m water depth on the delta slope off the mouth of the Fraser River. The measurements indicate current speeds exceeding 8 m s-1 and near bed (+ 2 m) concentrations of 16 g L-1 . At the site of the observations, multibeam surveys conducted soon after the event reveal little or no net change. However the adjacent slope is characterized by gully erosion and sediment accumulation on sediment waves alongslope and downslope of the gullies, indicating a thin sheet-like flow with locally more intense flows in the gullies.
Summary(Plain Language Summary, not published)
Results from the VENUS ocean observatory demonstrate the presence of powerful submarine bottom currents capable of overturning structures weighing over 1 tonne.