| ID |
2470 |
| Citation |
Petticrew, E.L (2005). Flocculation and aggregation of suspended and gravel-stored fine sediment in productive headwater streams - A case study of O’Ne-eil Creek, British Columbia, Canada. pp 71-93. In Flocculation in Natural and Engineered Environmental Systems. I.G. Droppo, G.G. Leppard, S.N. Liss, and T. G. Milligan (Eds) CRC Press, Boca Raton, FL. |
| Organization |
University of Northern British Columbia |
| URL |
http://www.unbc.ca/sites/default/files/assets/ellen_petticrew/floc_book_petticrew.pdf |
| Abstract/Description or Keywords |
The objective of this chapter is to evaluate the morphology, settling behaviour, and characteristics of composite sediments that are transported and stored in a relatively undisturbed productive headwater stream. A case study of a highly productive salmon bearing stream is presented here with both the hydrologically important and biologically important periods of the open water season being investigated over several years. The focus of this chapter is the relationship of these changing environmental conditions with the sediment particle populations in both the water column and gravel storage. The changes in composite particle morphology and their resultant dynamic characteristics (settling rate and densities) were evaluated temporally over a range of open water conditions (May through October) while both the physical environment (suspended sediment load, stream velocities, and shear stresses) and the biological inputs to the stream changed. Earlier work on O’Ne-eil Creek, reporting on the structure and composition of suspended and gravel stored sediment, indicated that in these biologically active headwater streams the fines (sediments< 63_m) were well flocculated.3,12 The aggregates or flocs exhibited maximum sizes 7 (suspended) to 14 (gravel stored) times greater than the maximum size of the constituent inorganic material comprising the composite structures.3 Petticrew and Droppo9 visually identified different composite structures and observed that these loosely bound flocs and compact aggregates exhibited different settling behaviors and size ranges. As these data were collected during the 1996 die-off of 10,722 sockeye salmon (Oncorhynchus nerka) that had returned to the stream to spawn, follow-up work was undertaken to evaluate the importance of the biological and physical influence of the fish upon the morphometric and dynamic properties of the sediment. |
| Information Type |
Chapter |
| Regional Watershed |
Fraser River |
| Sub-watershed if known |
O'Ne-eil Creek |
| Aquifer # |
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| Comments |
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| Project status |
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| Contact Name |
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| Contact Email |
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