Periglacial shoreline erosion of a rocky coast : George River Estuary, northern Quebec

摘要: Shore erosion landforms in bedrock were observed along the estuary of George River a macrotidal periglacial environment. Quarrying cavities gneissic is largely dependent on geological structure, principally joints and foliations. Frost-riving operating jointed rock loosens preconfigured blocks that are thereafter mobilized by waves sea ice. Gelifraction frost shattering shore more effective at places where streamlets flow to fresh water seeps throughout structure. Measurements profiles made relative initially glacial-sculptured intertidal outcrops. Erosional whole shoreline length study area which was also classified into segments according slope angle, geographic orientation fetch. Observations indicate intensive sectors having low medium angles allow ice override large fetches favour wave pounding sea-ice thrusting. The takes place preferentially around mean high tide level. knowledge acting erosional processes resulting recognition raised features associated with post-glacial, uplifted shorelines. These correspond very well elevation conspicuous shorelines Quaternary sediments region. Some age correlations major dated Holocene eastern Canadian Arctic suggested.