Author(s): G. Post; R. Slopek; D. Shepherd; C. Katopodis; K. Matheson
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Abstract: While many in-stream structures are designed to ensure adequate fish passage post construction, fish passage during the construction phase is rarely given equivalent consideration. The Dunvegan Hydroelectric Project is a proposed run-ofriver facility on the Peace River near Dunvegan, Alberta. To facilitate construction, sheet pile cofferdams extending into the river from both shores during earlier stages and becoming in-river structures during later stages (with flow on either side) will be utilized. A 1:20 scale fixed-bed flume model was used to develop upstream fish passage options during the construction period. With level and plane bathymetry, the flume reproduced a rectangular cofferdam section extending from the left bank. Velocities at the upstream corner of the cofferdam were considered likely to impede upstream fish migration. Conditions suitable for upstream fish passage were achieved by modifying the trash-rack piers located on the upstream side of the cofferdam; permanent facility components which will be installed simultaneously with the sheet piles. The modifications developed during testing resulted in suitable hydraulic conditions for fish passage, and provided design flexibility to deal with actual construction conditions.
Year: 2009