2019 CSDMS meeting-078: Difference between revisions

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|CSDMS meeting coauthor first name abstract=David
|CSDMS meeting coauthor first name abstract=Gwyn
|CSDMS meeting coauthor last name abstract=Lintern
|CSDMS meeting coauthor last name abstract=Lintern
|CSDMS meeting coauthor institute / Organization=Pacific Geoscience Center
|CSDMS meeting coauthor institute / Organization=Pacific Geoscience Center
|CSDMS meeting coauthor town-city=Victoria
|CSDMS meeting coauthor town-city=Sidney
|CSDMS meeting coauthor country=Canada
|CSDMS meeting coauthor country=Canada
|CSDMS meeting coauthor email address=gwyn.lintern@canada.ca
|CSDMS meeting coauthor email address=gwyn.lintern@canada.ca
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|CSDMS meeting coauthor last name abstract=Conway
|CSDMS meeting coauthor last name abstract=Conway
|CSDMS meeting coauthor institute / Organization=Pacific Geoscience Center
|CSDMS meeting coauthor institute / Organization=Pacific Geoscience Center
|CSDMS meeting coauthor town-city=Victoria
|CSDMS meeting coauthor town-city=Sidney
|CSDMS meeting coauthor country=Canada
|CSDMS meeting coauthor country=Canada
|CSDMS meeting coauthor email address=kim.conway@canada.ca
|CSDMS meeting coauthor email address=kim.conway@canada.ca
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{{CSDMS meeting abstract template 2019
{{CSDMS meeting abstract template 2019
|CSDMS meeting abstract=Natural Resources Canada marine geoscience surveys have acquired multibeam and
|CSDMS meeting abstract=HydroTrend and Sedflux models are being initially evaluated within a bedrock confined estuary in British Columbia, Canada using Natural Resources Canada (NRCAN) sedimentation data. Model results will then be used to determine sedimentation conditions in the Skeena Estuary, including important eelgrass beds and major port development areas. NRCAN marine geoscience surveys have acquired multibeam and acoustic backscatter datasets, piston cores, and grab samples across the Skeena Estuary and the contiguous marine areas. Data from these cruises have been compiled to produce an overview of seabed geomorphology, texture and sedimentation rates in the estuary and marine approaches. The model HydroTrend was used to estimate incoming sediment load from the Skeena River. Model estimates for suspended sediments are higher than past estimates due to a large contribution of suspended sediment predicted within a portion of the Skeena watershed previously excluded due to a lack of available hydrographic data. Sedimentation rates of 2.9 cm/yr estimated with the SedFlux model using HydroTrend sediment load results were similar to sedimentation rates of 2.75 cm/yr in Ogden Channel derived from radiocarbon-dated sediment cores. Cores recovered mud sequences in Ogden Channel, proximal to the Base Sands, and within Marcus Passage where radiocarbon dates indicated that sedimentation rates were as high as 2.83 cm/yr. In comparison, sedimentation rates further offshore in Chatham Sound are as low as 0.004 cm/yr. A relatively high sedimentation rate and seaward fining trend in grain size are interpreted as indicators of high riverine input to the seabed regionally.
acoustic backscatter datasets, piston cores, and grab samples across the Skeena Estuary and
the contiguous marine areas. Data from these cruises have been compiled to produce an
overview of seabed geomorphology, texture and sedimentations rates in the estuary and
marine approaches. The model HydroTrend was used to estimate incoming sediment load from
the Skeena River. Model estimates for suspended sediments are higher than past estimates due
to a large contribution of suspended sediment predicted within a portion of the Skeena
watershed previously excluded due to a lack of available hydrographic data. At the same
distance from the river mouth, sedimentation rates of 2.9 cm/yr estimated with the SedFlux
model using HydroTrend sediment load results were similar to sedimentation rates of 2.75
cm/yr in Ogden Channel derived from radiocarbon-dated sediment cores. Cores recovered mud
sequences in Ogden Channel, proximal to the Base Sands, and within Marcus Passage where
radiocarbon dates indicated that indicated sedimentation rates were as high as 2.83cm/yr. In
comparison, sedimentation rates further offshore in Chatham Sound are as low as 0.004cm/yr.
A relatively high sedimentation rate, seaward fining trends in grain size, and very poorly sorted
sediments with a dominant presence of fine sediments were interpreted as indicators of high
riverine input to the seabed regionally
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Revision as of 13:59, 30 March 2019





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Skeena River Estuary and Marine Approaches: Patterns and Rates of Sedimentation

Amanda Wild, University of Victoria Victoria , Canada. awild@uvic.ca
Eva Kwoll, University of Victoria Victoria , Canada. ekwoll@uvic.ca
Gwyn Lintern, Pacific Geoscience Center Sidney , Canada. gwyn.lintern@canada.ca
Kim Conway, Pacific Geoscience Center Sidney , Canada. kim.conway@canada.ca


HydroTrend and Sedflux models are being initially evaluated within a bedrock confined estuary in British Columbia, Canada using Natural Resources Canada (NRCAN) sedimentation data. Model results will then be used to determine sedimentation conditions in the Skeena Estuary, including important eelgrass beds and major port development areas. NRCAN marine geoscience surveys have acquired multibeam and acoustic backscatter datasets, piston cores, and grab samples across the Skeena Estuary and the contiguous marine areas. Data from these cruises have been compiled to produce an overview of seabed geomorphology, texture and sedimentation rates in the estuary and marine approaches. The model HydroTrend was used to estimate incoming sediment load from the Skeena River. Model estimates for suspended sediments are higher than past estimates due to a large contribution of suspended sediment predicted within a portion of the Skeena watershed previously excluded due to a lack of available hydrographic data. Sedimentation rates of 2.9 cm/yr estimated with the SedFlux model using HydroTrend sediment load results were similar to sedimentation rates of 2.75 cm/yr in Ogden Channel derived from radiocarbon-dated sediment cores. Cores recovered mud sequences in Ogden Channel, proximal to the Base Sands, and within Marcus Passage where radiocarbon dates indicated that sedimentation rates were as high as 2.83 cm/yr. In comparison, sedimentation rates further offshore in Chatham Sound are as low as 0.004 cm/yr. A relatively high sedimentation rate and seaward fining trend in grain size are interpreted as indicators of high riverine input to the seabed regionally.


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