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Rapid retreat rates of sea cliffs exposing glacial material are a widespread problem, especially in Atlantic Canada, and one that will continue. Prediction of retreat rates at specific sites involves many variables, but a factor that has commonly been overlooked in such prediction is the slope of the bedrock surface under the glacial material. A glaciated bedrock platform is generally necessary to establish a stable situation of temporary equilibrium, and as sea-level rises, the bedrock slope determines the location of the new equilibrium position. An example from Nova Scotia shows that bedrock slope is so low on some coasts that the only long-range limiting factor is kinetic, i.e. how fast hydrodynamic energy can remove glacial material. Prediction of coastal retreat scenarios requires better information on the bedrock surface than is commonly available. SOMMAIRE Les taux de retrait rapide des falaises qui exposent des materiaux glaciaires est un probleme tres repandu et qui va perdurer, surtout dans le Canada atlantique. La prevision des taux de retrait sur des sites specifiques comporte de nombreuses variables et, la pente du substratum rocheux sur lequel reposent ces materiaux glaciaires et une variable qui a souvent ete negligee. L’existence d’un substratum rocheux glacie est generalement une condition necessaire pour l’etablissement d’une situation d'equilibre stable temporaire, et lorsque le niveau de la mer monte, la pente du substratum rocheux a une influence determinante sur le lieu de la nouvelle position d'equilibre. Un exemple en Nouvelle-Ecosse montre que la pente du substratum rocheux est si faible sur certaines cotes que le seul facteur determinant a long terme est la cinetique, c'est-a-dire la vitesse d’abrasion du materiau glaciaire correspondant a l’energie hydrodynamique. La prevision des scenarios de retrait de la ligne cotiere requiere une meilleure connaissance du substratum rocheux.

geoscience canada

Sea-cliff Erosion with Rising Sea-Level along Shores Exposing Glacial Material in Atlantic Canada: The Effect of Bedrock Slope and an Example from Isle Madame, Nova Scotia