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Forebay Thermal Dynamics at Hydropower Facilities on the Columbia River System Open Access


Other title
multiple vertical modes
linear stratification
thermal dynamics
thermal stratification
selective withdrawal
continuous stratification
fish entrainment
Type of item
Degree grantor
University of Alberta
Author or creator
Robertson, Catherine B.
Supervisor and department
Zhu, David (Water Resources Engineering)
Examining committee member and department
Flynn, Morris (Mechanical Engineering)
Zhu, David (Water Resources Engineering)
Steffler, Peter (Water Resources Engineering)
Department of Civil and Environmental Engineering
Water Resources Engineering
Date accepted
Graduation date
Master of Science
Degree level
The risk of fish entrainment is influenced by thermal dynamics within reservoir forebays. The study objective was to understand these dynamics at Kinbasket (Mica Dam), Revelstoke (Revelstoke Dam), and Arrow Lakes (Hugh Keenleyside Dam) reservoirs on the Columbia River. Temperature profiles measured in the forebay of Arrow Lake and Kinbasket portrayed two-layer and linear temperature profiles, respectively. A waveform analysis revealed most internal seiching periods were wind driven and multiple vertical modes at Kinbasket. In Kinbasket, 1 day mid-depth seiches had negative and positive correlations with low and high discharges, respectively. Calculations showed some Arrow Lake seiching was controlled by a boundary 100km upstream. Kinbasket seiching was controlled by 150km and 15km reaches. Calculations revealed selective withdrawal from the epiliminion in Arrow Lakes and withdrawal layer growth with discharge in Kinbasket. Revelstoke and Kinbasket historic temperature profiles were similar. Warmer local inflow at Revelstoke allowed development of an epiliminion layer.
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