Critical Shear Stresses for Erosion and Deposition of Fine Suspended Sediment from the Athabasca River
Critical Shear Stresses for Erosion and Deposition of Fine Suspended Sediment from the Athabasca River

Author: B. G. Krishnappan

Publisher: The Study

Published: 1996

Total Pages: 44

ISBN-13:

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"The transport characteristics of the fine sediment are essential parameters for modelling the transport, fate and bioaccumulation of contaminants in river systems. In this study, which was carried out for the Northern River Basins Study (NRBS), sediments from the Athabasca River near Hinton, Alberta were tested in the rotating flume and their transport parameters measured. A brief description of the experimental procedure and some significant results are presented in this report"--Abstract.

A New Model of Fine Sediment Transport for the Fraser River
A New Model of Fine Sediment Transport for the Fraser River

Author:

Publisher:

Published: 1998

Total Pages: 0

ISBN-13:

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The existing models of fine sediment transport assume that the fine sediments behave in the same manner as the coarse-grained sediment and use transport theories developed for the coarse sediment to treat the fine sediment. [...] Among the many differences between the two types of sediments, the most crucial is the difference in the critical condition for initiation and cessation of sediment motion in a flowing medium. [...] In other words, in deposition process of fine sediment, the amount of sediment that would deposit under a particular bed shear stress is a function of the amount of sediment introduced to the system initially, and the fraction of the sediment that would deposit is constant as long as the bed shear stress is held constant. [...] Note that the critical shear stress for erosion is almost two and a half times the critical shear stress for deposition, confirming the earlier result that the fine sediments of the Fraser River behave in a manner similar to that of the cohesive sediment. [...] The sediment quantity coming from the upstream segment will be subjected to the deposition only when the shear stress in the control segment is lower than that in the upstream segment.

Erosion and Sedimentation Manual
Erosion and Sedimentation Manual

Author:

Publisher: Government Printing Office

Published: 2006

Total Pages: 626

ISBN-13:

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NOTE: NO FURTHER DISCOUNT FOR THIS PRINT PRODUCT--OVERSTOCK SALE --Significantly reduced list price while supplies last The Erosion and Sedimentation Manual provides a comprehensive coverage of subjects in nine chapters (i.e., introduction, erosion and reservoir sedimentation, noncohesive sediment transport, cohesive sediment transport, sediment modeling for rivers and reservoirs, sustainable development and use of reservoirs, river process and restoration, dam decommissioning and sediment management, and reservoir surveys and data analysis). Each chapter is self-contained, with cross references of subjects that are discussed in different chapters of this manual. The manual also includes a list of commonly used notations used in the erosion and sedimentation literature, conversion factors between the Imperial and metric units, physical properties of water, and author and subject indexes for easy reference. Each chapter has a list of reference for readers who would like to seek out more detailed information on specific subjects. Audience The manual would be useful for researchers, university professors, graduate students, geologists, hydrographic survey analysts, municipal and state water research specialists, and engineers in solving erosion and sedimentation problems. Related products: Earth Science resources collection can be found here: https: //bookstore.gpo.gov/catalog/science-technology/earth-science

Transport Characteristics of Fine Sediment in the Fraser River System
Transport Characteristics of Fine Sediment in the Fraser River System

Author:

Publisher:

Published: 1998

Total Pages: 0

ISBN-13:

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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.

Flow and Suspended Sediment Transport Through the Gravel-sand Transition in the Fraser River, British Columbia
Flow and Suspended Sediment Transport Through the Gravel-sand Transition in the Fraser River, British Columbia

Author: Natalia Domarad

Publisher:

Published: 2011

Total Pages: 0

ISBN-13:

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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.