Abstract

Malgre l'emersion du continent due au relevement glacio-isostatique, le littoral du detroit de Manitounuk subi des reculs importants dans certains secteurs. L'evolution de la cote depend aussi de processus littoraux et de processus decoulant des conditions periglaciaires influences par les conditions physiques presentes et par les apports sedimentaires. L'analyse de photographies aeriennes de 1949, 1952, 1975, 1979 et 1990, ainsi que les observations recueillies sur le terrain a l'ete 1995 ont permis de cartographier les formes littorales caracterisant les processus actifs et de mesurer les avancees et les reculs survenus en 46 ans. On conclut que l'emersion du continent s'observe surtout sur les promontoires rocheux pourtant exposes aux vagues. Les marais littoraux accusent pour la plupart un recul important du principalement a la presence des depots quaternaires gelifs constitues de silts argileux.

Alternate abstract:

Despite the emergence of the continent due to glacio-isostatic uplift, the coastline of Manitounuk Strait suffered significant retreats in certain sectors. The evolution of the coast also depends on coastal processes and processes resulting from periglacial conditions influenced by the physical conditions present and by sedimentary inputs. The analysis of aerial photographs from 1949, 1952, 1975, 1979 and 1990, as well as observations collected in the field in the summer of 1995, made it possible to map the coastal forms characterizing the active processes and to measure the advances and retreats that have occurred. in 46 years. We conclude that the emergence of the continent is mainly observed on rocky promontories which are nevertheless exposed to waves. Most of the coastal marshes show a significant decline, mainly due to the presence of frozen Quaternary deposits made up of clayey silts.