Surficial geology, Iqaluit, Nunavut

Allard, Michel; Doyon, Jacques; Mathon-Dufour, V; LeBlanc, A M; L'Hérault, E.; Mate, D; Oldenborger, Greg A.; Sladen, W E

doi:10.4095/289503

Cited by 12 publications

(7 citation statements)

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“…The DInSAR spatial patterns of displacement align very well with the surficial materials ( Figure 3) and are in accordance with ground truth knowledge [2] [3] [4]. Areas of bedrock and thin surficial deposits (till veneer on bedrock) are not affected by surface movements, as expected.…”

Section: Surface Deformation In a Mining Environment Affected By Permsupporting

confidence: 79%

Operational use of SAR interferometry for surface and infrastructures movement monitoring

Sarago

Benoit

Bouroubi

et al. 2014

2014 IEEE Geoscience and Remote Sensing Symposium

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This paper presents three applications of SAR interferometry. In the first study, DInSAR technique applied to TerraSAR-X images acquired in Nunavik, northern Canada, showed that surface subsidence observed in the permafrost thaw period is more important in loose soil areas while no surface movement were detected in rock outcrop areas. In the second one, electricity transmission tower movement was simulated through controlled vertical displacements of corner reflectors. These displacements were clearly observed in six TerraSAR-X interferometric pairs, while no movement was detected in the surrounding stable surfaces. The third application relates to monitoring of a dam movement, before and after water impoundment, using SAR interferometry.

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Section: Surface Deformation In a Mining Environment Affected By Permsupporting

confidence: 79%

Operational use of SAR interferometry for surface and infrastructures movement monitoring

Sarago

Benoit

Bouroubi

et al. 2014

2014 IEEE Geoscience and Remote Sensing Symposium

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“…Territorial and First Nation governments in Canada have recognized this knowledge gap and have taken steps to better inform northern communities about geohazards that may affect them. Geohazard mapping initiatives spearheaded by government and commonly supported by academia have, for example, produced geohazard maps for a number of communities in Yukon (e.g., Benkert et al 2015;Cronmiller et al 2020), regionalscale thermokarst mapping ) and community-scale surficial geology mapping in communities in Northwest Territories (various 1:10,000 to 1:30,000 maps awaiting publication as open files), landscape hazard maps for communities in Nunavut (e.g., Forbes et al 2014), and permafrost-related risk maps for the Nunavik region of northern Quebec (e.g., Allard et al 2020). Still, many northern communities remain with little to no geohazardrelated information.…”

Section: Collaborative Workflow Among First Nations Territorial Gover...mentioning

confidence: 99%

“…The majority of the MTQ airstrips are 1090 m long and 44 m wide, covered by gravel material. Of these airports, two are built on sporadic discontinuous permafrost (Kuujjuarapik and Umiujaq).Access roads between the airport infrastructure and local communities were gravel-surfaced during the construction and were paved in the 2000s to improve performance(L'Hérault et al 2012). During the construction of the MTQ infrastructure in Nunavik between 1984 and 1991, the climate was relatively stable, and permafrost was considered a solid, permanent foundation.…”

mentioning

confidence: 99%

Proceedings of the 12th International Conference on Permafrost: Volume 2 (Conference Papers)

2024

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“…2). The landscape is a product of glacial erosion, which formed a number of rock ridges trending from northwest to southeast with thin till or shallow marine deposits in the intervening depressions (Hodgson, 2005;Allard et al, 2012). The rock is granitic and resistant to erosion.…”

Section: Environmental Settingmentioning

confidence: 99%

Exposure to Coastal Hazards in a Rapidly Expanding Northern Urban Centre, Iqaluit, Nunavut

Hatcher¹,

Forbes²

2015

ARCTIC

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ABSTRACT. The City of Iqaluit, Nunavut, is an expanding urban centre with important infrastructure located in the coastal zone. This study investigates the exposure of this infrastructure to coastal hazards (rising mean sea level, extreme water levels, wave run-up, and sea ice). Using a coastal digital elevation model, we evaluate the inundation and flooding that may result from projected sea level rise. Some public and private infrastructure is already subject to flooding during extreme high water events. Using a near upper-limit scenario of 0.7 m for relative sea level rise from 2010 to 2100, we estimate that critical infrastructure will have a remaining freeboard of 0.3-0.8 m above high spring tide, and some subsistence infrastructure will be inundated. The large tidal range, limited over-water fetch, and wide intertidal flats reduce the risk of wave impacts. When present, the shorefast ice foot provides protection for coastal infrastructure. The ice-free season has expanded by 1.0-1.5 days per year since 1979, increasing the opportunity for storm-wave generation and thus exposure to wave run-up. Overtopping of critical infrastructure and displacement by flooding of subsistence infrastructure are potential issues requiring better projections of relative sea level change and extreme high water levels. These results can inform decisions on adaptation, providing measurable limits for safe development.Key words: Arctic coast; adaptation planning; infrastructure; sea level rise; flooding; sea ice; climate change; coastal management RÉSUMÉ. La ville d'Iqaluit, au Nunavut, est un centre urbain en plein essor doté d'infrastructures importantes sur la zone côtière. Cette étude se penche sur l'exposition de cette infrastructure aux risques côtiers (niveau de la mer montant, niveaux d'eau extrêmes, vagues et glace de mer). À l'aide d'un modèle numérique de l'élévation côtière, nous évaluons les inondations et les submersions susceptibles de découler de la montée projetée du niveau de la mer. Certaines infrastructures publiques et privées sont déjà la cible d'inondations en présence de très hautes eaux. En nous appuyant sur un scénario dont la limite supérieure est de près de 0,7 m pour la hausse relative du niveau de la mer de 2010 à 2100, nous estimons que les infrastructures critiques auront un franc bord de 0,3 à 0,8 m au-dessus de la marée haute de vives-eaux, et une partie des infrastructures de subsistance sera inondée. La grande amplitude de la marée, le fetch limité sur l'eau et les larges battures intertidales réduisent le risque de l'impact des vagues. Lorsqu'elle est présente, la glace de rive offre une protection aux infrastructures côtières. Depuis 1979, la saison sans glace s'est prolongée de 1,0 à 1,5 jour par année, ce qui augmente la possibilité de la formation de vagues de tempête et, par conséquent, l'exposition aux jets de rive. La submersion des infrastructures critiques et le déplacement des infrastructures de subsistance par les inondations constituent des enjeux potentiels qui doivent faire l'obj...

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Surficial geology, Iqaluit, Nunavut

Cited by 12 publications

References 0 publications

Operational use of SAR interferometry for surface and infrastructures movement monitoring

Operational use of SAR interferometry for surface and infrastructures movement monitoring

Proceedings of the 12th International Conference on Permafrost: Volume 2 (Conference Papers)

Exposure to Coastal Hazards in a Rapidly Expanding Northern Urban Centre, Iqaluit, Nunavut

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