The actual periglacial dynamics in an atlantic high mountain environment: Oppland and Sor-Trondelag National Parks, central Norway

• Main Author: Kerguillec, Riwan
• Other Authors: Littoral, Environnement, Télédétection, Géomatique (LETG - Nantes), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Pratique des Hautes Études (EPHE), Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Université de Brest (UBO)-Université de Rennes 2 (UR2)-Centre National de la Recherche Scientifique (CNRS)-Institut de Géographie et d'Aménagement Régional de l'Université de Nantes (IGARUN), Université de Nantes (UN)-Université de Nantes (UN), Université de Nantes, Dominique Sellier
• Format: Doctoral or Postdoctoral Thesis
• Language: French
• Published: HAL CCSD 2013
• Subjects: periglacial belts; geomorphology; atlantic mountains; climate change; géomorphologie; fluctuations climatiques; géomorphosites; montagnes atlantiques; étagements périglaciaires; [SHS.GEO]Humanities and Social Sciences/Geography; Arctic; Climate change; Dovrefjell
• Online Access: https://hal.science/tel-01114222; https://hal.science/tel-01114222/document; https://hal.science/tel-01114222/file/th%C3%A8se%20pdf.pdf; https://hal.science/tel-01114222/file/fascicule%20pdf.pdf

The norwegian massifs of Dovrefjell and Rondane belong to the Scandes and are among its highest summits. In accordance with their distance to the sea and with the proximity of the Arctic Circle, they represent a climatic transition location characterized at the same time by oceanic, polar and continental influences. This climate is favourable for periglacial dynamics. The quartzitic structure of the massifs is particularly convenient to frost action in soils and rocks. For these two reasons, they have one of the thickest active periglacial belt of Europe which occures from 900-950 m a.s.l. up to the summits. By using the observation of functional periglacial features, the first aim of this work is to provide elements for the delimitation of this belt. Added to the exceptional legibility of the functional periglacial belt of the massifs is also their sensitivity to climate fluctuations. The second aim of this study is to emphasize the mobility of the active periglacial belt since the end of the Little Ice Age. At the present time, this mobility associates reconquest dynamics on glacial margins and dynamics of decay within the functional periglacial belt. Both massifs are also National parks since several decades. Thus, the last aim of this work is to extract geomorphic informations from this research that can be transmitted to the public by a popularization method. Thus, this work gives a new example of applied search. Les massifs norvégiens du Dovrefjell et des Rondane appartiennent à la chaîne des Scandes et comptent parmi les plus hauts sommets scandinaves en raison de leurs altitudes voisines de 2 200 m. Leur faible distance à la mer justifie leur appartenance aux montagnes atlantiques de l’Europe du nord-ouest en même temps qu’ils sont positionnés aux avant-postes des domaines polaires : ces montagnes subissent donc, de fait, les effets combinés de la latitude, de l’altitude, de l’océanité et de la continentalité. Cette situation géographique particulière détermine un climat montagnard de transition entre ...