CGU HS Committee on River Ice Processes and the Environment 15th Workshop on River Ice St. John’s, Newfoundland and Labrador, June 15 - 17, 2009 Modeling Ice Cover Consolidation during Freeze-up on the Peace River, AB Faye Hicks1, Robyn Andrishak1,2 and Yuntong She2 1 Dept. of Civil and Environmental Engineering University of Alberta, Edmonton, AB, T6G 2G7
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[email protected] Winter can be a time of severely constrained flow-peaking operations for hydro-power facilities, since there is often a concern that fluctuating water levels can destabilize a fragile, developing ice cover. If the resulting ice cover consolidation results in a severe freeze-up ice jam, flooding may occur. The Peace River in northern Alberta presents just such a situation; numerous consolidation events have been documented on the Peace River over the years, including a very large event in January 1982. The weather over Christmas 1981 and into early January 1982 was extremely cold and the developing ice front on the Peace River propagated at a rapid pace. In response to increased power demands (also attributable to the severe cold weather) flows in the Peace River were increased from about 900 m3/s to approximately 1800 m3/s over a period of 5 days in early January 1982. A massive consolidation of the ice cover followed, producing record water levels. In response, groundwater levels increased to the point where basement flooding occurred in the Town of Peace River.