| Titre | Implementing remote sensing tools to examine permafrost dynamics and impacts to infrastructure |
| Auteur | Kokelj, S V; van der Sluijs, J; Fraser, R H; Tunnicliffe, J; Lantz, T C; Rudy, A C A; Lamoureux, S F; Rusk, B; Morse, P D |
| Source | 2017 Yellowknife Geoscience Forum, abstract and summary volume; Northwest Territories Geological Survey, Yellowknife Geoscience Forum Abstract and Summary Volume 2017, 2017 p. 40-41 (Accès
ouvert) |
| Liens | Online - En ligne (complete volume -
volume complet)
|
| Année | 2017 |
| Séries alt. | Ressources naturelles Canada, Contribution externe 20180067 |
| Éditeur | Commission géologique des Territoires du Nord-Ouest |
| Réunion | 45th Annual Yellowknife Geoscience Forum; Yellowknife, NT; CA; Novembre 14-16, 2017 |
| Document | publication en série |
| Lang. | anglais |
| Media | papier; en ligne; numérique |
| Formats | pdf |
| Sujets | télédétection; imagerie par satellite; satellite LANDSAT; pergélisol; glissements de terrain; glissements; déplacement; regimes d'écoulement; glissements de pentes; transport des sediments; dispersion des
sédiments; climat; modélisation numérique de terrain; températures au sol; glace fossile; réseaux hydrographiques; morphologie; techniques de cartographie; changement climatique; infrastructure communautaire; études nordiques; méthodologie; géologie
de l'environnement; géologie des dépôts meubles/géomorphologie; géophysique; géologie de l'ingénieur; Nature et environnement |
| Programme | Pergélisols, Géosciences de changements climatiques |
| Résumé | (disponible en anglais seulement)
Climate-driven thaw is altering permafrost landscapes and increasing the stresses on northern infrastructure and communities. The rapid rates of change have
heightened the need for monitoring and research tools that are cost-effective, flexible, and that can accommodate timely acquisition of imagery at site-specific and regional scales. Emerging remote sensing tools and spatial analysis techniques are
advancing site investigations and terrain mapping studies. Unmanned Aircraft Systems (UAS) have been implemented to study fine-scale permafrost dynamics and infrastructure impacts. UAS methods were used to assess the volume of materials displaced by
thaw slumps, and to quantify earth flow dynamics and the displacement of road embankments. These studies were accomplished by deriving high-resolution digital terrain models and implementing image correlation techniques from repeat surveys. These
results provide new information on modes of slope failure, geotechnical behaviour of materials, and mechanisms of downslope sediment transfer. Along the Dempster Highway, UAS were used to monitor uplift or settlement associated with the development
or degradation of injection ice. The surveys combined with active layer and ground temperature data and road maintenance records provide information on the processes of ice accumulation and icing development adjacent to northern roads. UAS can also
be used to monitor the evolution of anthropogenic disturbances such as borrow pits. Repeat UAS surveys were conducted to derive digital terrain models of borrow pits for regulatory monitoring and to inform possible mitigations. These monitoring
products are shown to effectively track thaw-related impacts, drainage pathways, downslope sedimentary linkages, ice features and landscape morphology. These process-oriented studies and infrastructure monitoring activities are contextualised by
regional-scale terrain mapping using LiDAR and high-resolution satellite imagery. Terrain mapping is improved through field validation exercises and the development of standard keys for interpreting landscape forms and processes. The increasing
availability of high-resolution imagery and interests in permafrost landscape change are yielding a growing number of spatial datasets, which describe patterns of landscape change, geohazards and permafrost geomorphic characteristics. These fine- to
medium-scale mapping products and associated field investigations can be used to validate coarse-resolution Landsat derived change products which are valuable tools for monitoring landscape change and assessing spatial patterns and downstream
effects. Integrating multi-scale remote sensing approaches has been useful in linking a process-based understanding of thaw-driven impacts with broad-scale permafrost landscape change. |
| Résumé | (Résumé en langage clair et simple, non publié)
Le dégel dominé par le climat modifie les paysages du pergélisol et accroît les pressions sur les infrastructures et les collectivités du Nord.
Les taux de changement rapides augmentent le besoin d'outils de surveillance et de recherche qui sont rentables, flexibles et qui peuvent permettre l'acquisition rapide d'images à l'échelle du site et à l'échelle régionale. Les nouveaux outils de
télédétection et les techniques d'analyse spatiale font progresser les études de site et les études de cartographie du terrain. Une approche, combinant des analyses d'images satellitaires avec de nouveaux produits de données de Unmanned Aircraft
Systems et des enquêtes sur le terrain, est en cours d'élaboration en collaboration pour améliorer la compréhension des effets du dégel grâce à un changement à grande échelle du paysage et du pergélisol. |
| GEOSCAN ID | 308271 |
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