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TitreUnstable permafrost slope monitoring using permanent scatterers interferometry, Mackenzie Valley, Canada's Northwest Territories
AuteurCouture, R; Riopel, S; Poncos, V; Hawkins, R; Murnaghan, K; Singhroy, V
SourceIPY GeoNorth 2007: First international circumpolar conference on geospatial sciences and applications, program with abstracts; 2007, 10 pages
Séries alt.Secteur des sciences de la Terre, Contribution externe 20110012
RéunionIPY GeoNorth 2007: First International Circumpolar Conference on Geospatial Sciences and Applications; Yellowknife; CA; août 19-24, 2007
ProvinceTerritoires du Nord-Ouest
SNRC106O/05; 106O/06; 106O/07; 106O/10; 106O/11; 106O/12
Lat/Long OENS-132.0000 -130.5000 67.7500 67.2500
Sujetstélédétection; pergélisol; congélation du sol; glace fossile; glissements de terrain; dépôts de glissement de terrain; dépôts de pentes; glissements de pentes; stabilité des pentes; pipelines; géologie des dépôts meubles/géomorphologie; géologie de l'ingénieur
Illustrationslocation maps; photographs; plots; diagrams
ProgrammeLa mise en valeur des ressources du Nord
Résumé(disponible en anglais seulement)
Remote sensing can become an excellent solution to challenges associated with monitoring of slopes showing on-going displacements, especially in remote, harsh areas like the northern Canada permafrost environments. Amongst the remote sensing techniques, Interferometric Synthetic Aperture Radar (InSAR) has been developing rapidly, including its application to landslides and mass movements in circumpolar regions. Permanent scatterers are a solution to the problem of sustaining satellite scene coherence in analyzing and interpreting SAR images. Ground properties such as natural backscatterers like vegetation, humidity, soil properties, and deformation change rates influence the backscattered signal phase. The SAR spaceborne sensor geometry and acquisition rate influence the quality of the measurements. These two types of properties influence the coherence of the interferometric images. A set of aluminium trihedral corner reflectors have been successfully deployed for the first time in the Canadian circumpolar regions to monitor permafrost slopes affected by landslides in the Mackenzie Valley. Ten corner reflectors have been installed at or in the vicinity of three landslides situated in an adjacent valley east of the Thunder River valley, about 140 km southeast of Inuvik. This area encompasses a section of the new proposed gas pipeline route that will connect the Mackenzie Delta reservoirs to Alberta facilities. This paper briefly presents the permanent scatterers interferometry InSAR technique, the deployment of corner reflectors, their anchoring systems developed specifically for the permafrost environment, and the local slopes and landslide conditions. Preliminary results are also discussed with respects to analysing interferometric phase between stable and active corner reflectors.