cover image: Transport characteristics of fine sediment in the Fraser River system

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Transport characteristics of fine sediment in the Fraser River system

18 Mar 1999

In the field surveys, the in-situ size distributions of the suspended sediments of the Fraser and Thompson rivers were measured using a laser device and were compared with the size distribution of the dispersed primary particles. [...] On the other hand, if the sediment is in the size classes of silt and clay, it is classified as cohesive sediment and its transport is characterized by the interactions among the sediment grains and the formation of sediment flocs depending on the flow turbulence and physical-chemical processes of sediment water mixture. [...] Therefore, the transport of the contaminated sediment determines the fate of the contaminants and their interactions with the benthic organisms in the riverine environment. [...] For example, deposition of the contaminated sediment in sections of the river, where the bed shear stress and turbulence level are low, could 1 result in a temporary storage of the contaminants on the river bed and could impact on the bottom dwelling aquatic life and the other organisms connected by the food chain. [...] To ascertain that this is not due to the presence of solid particles (bio-solids) in the effluent, the size distribution of the solids in the effluent was measured and is shown in Figure 4. From this figure, we see that the size distribution of the solids in the effluent is slightly coarser than the primary particles, but not as coarse as the distribution measured for the 300 m transect.
environment environmental protection natural resources earth sciences flocculation geology physical sciences rivers erosion ecosystem sedimentology economy, business and finance river sediment river ecosystem deposition (geology) sedimentary deposit deposited depositing flocculated sediment transport coagulant sediment transporting floc
Pages
35
Published in
Vancouver

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