Courbes de remous sous les couverts de glace de la Grande Rivière

• Published in: Canadian Journal of Civil Engineering
• Main Authors: Michel, B., Drouin, M.
• Format: Article in Journal/Newspaper
• Language: English
• Published: Canadian Science Publishing 1981
• Subjects: General Environmental Science; Civil and Structural Engineering; La Grande River; La Grande Rivière
• Online Access: http://dx.doi.org/10.1139/l81-044; http://www.nrcresearchpress.com/doi/pdf/10.1139/l81-044

The problem of backwater curve computations under ice covers is very complex. On top of the difficulties which are inherent to computation of backwater curves under open water flow conditions, the ice cover has to be taken into account; its thickness and roughness is time dependent because of variable flow and weather conditions. One of the major factors is the formation of hanging ice dams, especially in most northerly rivers.In this paper we present a complete method for the computation of backwater curves, based on mechanisms of ice formation: the law of equilibrium of the frontal edge, the accumulation of ice under this edge, thermal growth, and finally the equilibrium of hanging dams. The method is based upon measurements taken in the La Grande River.