Proceedings - Teaching and Learning Centre - Simon Fraser ...

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Fraser River Action Plan 3rd Research Workshop Information Gaps 1. Toxicological implications of contaminants associated with suspended sediments 2. Guidelines/criteria for contaminants associated with suspended sediments 3. Site specific objectives for the Fraser River 4. Tributary input information 5. More data on contaminant phase partitioning under variable field conditions Page 81
Fraser River Action Plan 3rd Research Workshop In-River Flocculation Processes and the Transport of Suspended Sediment B.G. Krishnappan, P. Engel and R. Stephens National Water Research Institute Abstract The objective of this FRAP project was to study the transport processes of suspended sediments of the Fraser and Thompson river systems and to determine the transport functions that are needed to model the sediment and contaminant transport both in the near-field and far-field regions. The work carried out under this project so far consisted of field surveys and laboratory investigations. In the field surveys, the size distributions of the suspended sediment were measured using an immersible laser particle size analyzer that was assembled at the National Water Research Institute and were compared with the size distribution of the primary particles. From these comparisons, one can determine the extent of flocculation of the suspended sediment in different reaches of the river systems. The results showed that the sediment in the mainstem Fraser, upstream of the Northwood pulp mill was not flocculated while the sediment in the downstream reach was. The flocculation of the sediment in the downstream reach was attributed to the presence of pulp mill effluents. The size distribution data also showed that the flow conditions in the river played a major role in determining size of flocs. The role of the hydrodynamics on the flocculation process was investigated in the laboratory using the rotating circular flume of the National Water Research Institute. The flume experiments shed new light on the transport characteristics of the fine sediments of the Fraser and Thompson river systems and allowed formulation of a new sediment transport algorithm that can be incorporated in the far-field food chain and bioaccumulation model and the near-field plume interaction model that are being developed for the Fraser River Action Plan. The present study extends only up to Mission and does not include the estuary region. The sediment behaviour in the estuary could be very different from that observed in the present study because of the saltwater intrusion and the tidal effects. These effects have to be quantified in order to extend the models into the estuary regions. Page 83
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PROCEEDINGS 3rd RESEARCH WORKSHOP F
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TABLE OF CONTENTS Participants ....
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Development of a Citizen’s Monito
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Fraser River Action Plan 3rd Resear
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SESSION 1 PULP MILL EFFLUENT ISSUES
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SESSION 4 AGRICULTURAL ISSUES
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SESSION 5 BIOLOGICAL INDICATORS
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SESSION 6 ESTUARY ISSUES
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Fraser River Action Plan The Use of
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Fraser River Action Plan Concluding
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