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Flow and suspended sediment transport through the gravel-sand transition in the Fraser River, British Columbia

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Thesis type
(Thesis) M.Sc.
Date created
The Fraser River, British Columbia is a large alluvial channel that features an abrupt gravel-sand transition that occurs due to a dramatic slope change and the ocean base-level control. There have been no previous observations of the sediment dynamics through transitions in rivers of this scale. I examine the spatial and temporal changes in flow and the suspended sediment transport regime through the transition using hydro-acoustics in an attempt to test the hypothesis that sand in the gravel-bedded reach is coming out of suspension to form the sand-bedded reach. The results indicate that during high flows a downstream shear stress gradient does not exist and the suspended sediment flux declines downstream until the sand-bedded reach where the flux increases. These results suggest that there is a sediment supply gradient and during low flows sand is stored in the gravel-bedded reach and only released to the sand-bedded reach during large floods.
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Supervisor or Senior Supervisor
Thesis advisor: Venditti, Jeremy G.
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