Presentation Title

Sediment processes on the Fraser Delta

Session Title

Session S-03G: Ecosystem Services and Impacts of Sediment for Salish Sea Recovery

Conference Track

Shorelines

Conference Name

Salish Sea Ecosystem Conference (2014 : Seattle, Wash.)

Contributing Repository

Digital content made available by University Archives, Heritage Resources, Western Libraries, Western Washington University.

Start Date

30-4-2014 3:30 PM

End Date

30-4-2014 5:00 PM

Abstract

Sediment processes on the Fraser Delta, British Columbia, are being observed using a real time scientific ocean network maintained and operated by Ocean Networks Canada and the Geological Survey of Canada. The instruments have detected many features of sediment transport including plume settling characteristics, deposition rates, conditions for tidal resuspension and transport. This information would be useful for the understanding of remobilization and transport of contaminants from the Fraser River. Among the key findings, settling rates might be faster than stokes settling alone would account for, and annual bed-building deposition is interrupted by massive erosion events at certain tides. In addition to the transport modes above, the instruments have registered several turbidity current events, and in at least two cases these were strong enough to lift the 1-tonne platform off the seabed and send it tumbling, all the time measuring rarely measured properties of the turbidity currents. These turbidity currents would remove sediment and presumably contaminants to deep water in the Salish Sea (though we are not measuring contaminants directly). In this presentation, we show highlights of our measurements on the modes of sediment transport on the Fraser Delta.

Rights

This resource is displayed for educational purposes only and may be subject to U.S. and international copyright laws. For more information about rights or obtaining copies of this resource, please contact University Archives, Heritage Resources, Western Libraries, Western Washington University, Bellingham, WA 98225-9103, USA (360-650-7534; heritage.resources@wwu.edu) and refer to the collection name and identifier. Any materials cited must be attributed to the Salish Sea Ecosystem Conference Records, University Archives, Heritage Resources, Western Libraries, Western Washington University.

Language

English

Format

application/pdf

Type

Text

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Apr 30th, 3:30 PM Apr 30th, 5:00 PM

Sediment processes on the Fraser Delta

Room 6E

Sediment processes on the Fraser Delta, British Columbia, are being observed using a real time scientific ocean network maintained and operated by Ocean Networks Canada and the Geological Survey of Canada. The instruments have detected many features of sediment transport including plume settling characteristics, deposition rates, conditions for tidal resuspension and transport. This information would be useful for the understanding of remobilization and transport of contaminants from the Fraser River. Among the key findings, settling rates might be faster than stokes settling alone would account for, and annual bed-building deposition is interrupted by massive erosion events at certain tides. In addition to the transport modes above, the instruments have registered several turbidity current events, and in at least two cases these were strong enough to lift the 1-tonne platform off the seabed and send it tumbling, all the time measuring rarely measured properties of the turbidity currents. These turbidity currents would remove sediment and presumably contaminants to deep water in the Salish Sea (though we are not measuring contaminants directly). In this presentation, we show highlights of our measurements on the modes of sediment transport on the Fraser Delta.