Identification of avalanche-prone areas through topographic analysis in Nunavik

International audience Nunavik, a northern Quebec region located beyond the 55th northern parallel and characterized by a hilly terrain, presents topographic and meteorological conditions that may lead to slope hazards. Some villages are located in glacial valleys (e.g., Umiujaq, Salluit, Kangiqsual...

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Bibliographic Details
Main Authors: Filion, Vincent, Decaulne, Armelle, Bhiry, Najat
Other Authors: Université Laval Québec (ULaval), Centre for Northern Studies, Littoral, Environnement, Télédétection, Géomatique (LETG - Nantes ), Université de Brest (UBO)-Université de Rennes 2 (UR2)-Centre National de la Recherche Scientifique (CNRS)-Littoral, Environnement, Télédétection, Géomatique UMR 6554 (LETG), 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 (Nantes Univ - IGARUN), Nantes Université - pôle Humanités, Nantes Université (Nantes Univ)-Nantes Université (Nantes Univ)-Nantes Université - pôle Humanités, Nantes Université (Nantes Univ)-Nantes Université (Nantes Univ)-Centre National de la Recherche Scientifique (CNRS)-Institut de Géographie et d'Aménagement Régional de l'Université de Nantes (Nantes Univ - IGARUN), Nantes Université (Nantes Univ)-Nantes Université (Nantes Univ), ANR-11-LABX-0010,DRIIHM / IRDHEI,Dispositif de recherche interdisciplinaire sur les Interactions Hommes-Milieux(2011)
Format: Conference Object
Language:English
Published: HAL CCSD 2024
Subjects:
Online Access:https://hal.science/hal-04622258
https://hal.science/hal-04622258/document
https://hal.science/hal-04622258/file/7_Poster_Filion_2024.pdf
https://doi.org/10.34972/driihm-fcb73e
Description
Summary:International audience Nunavik, a northern Quebec region located beyond the 55th northern parallel and characterized by a hilly terrain, presents topographic and meteorological conditions that may lead to slope hazards. Some villages are located in glacial valleys (e.g., Umiujaq, Salluit, Kangiqsualujjuaq), while climate changes are increasing snowfall and winter thawing episodes, gathering frequent avalanche-prone conditions. The rapid population growth in the Inuit communities in permafrost thawing context lead to village expansion towards potential avalanche-prone areas, resulting in further exposure of inhabitants. However, historical data on slope events are very limited or nonexistent, thus there is a need to update and enhance knowledge related to avalanche conditions in Nunavik. This research, conducted in close collaboration with local communities and the Kativik Regional Government (KRG), relies on LiDAR data, satellite images, and photographs taken with automatic trigger cameras (ReconyxTM Hyper Fire2). Considered variables include slope steepness, wind origin and exposure, elevation, and vegetation cover. The analyses enable to validate and map the avalanche potential of specific sectors. Maximum runout distances are then estimated using empirical topographic models. This approach has so far enabled the characterization of avalanche areas near the villages of Kangiqsualujjuaq and Umiujaq. Le Nunavik, un territoire québécois situé au nord du 55e parallèle et caractérisé par un relief peu accidenté, présente des conditions topographiques et météorologiques propices aux aléas de versant. Certains villages sont situés dans des vallées glaciaires (p. ex. Umiujaq, Salluit, Kangiqsualujjuaq), alors que les changements climatiques augmentent les précipitations neigeuses et les épisodes de redoux générant des conditions qui favorisent l’occurrence d’avalanches. La forte croissance démographique enregistrée dans les communautés inuites en contexte de dégel du pergélisol force l’extension des villages vers ...