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TitreCoastal stability assessment, a case study of 5 locations within the Coronation Gulf, Nunavut
AuteurWhalen, D; Fraser, P; Salive, B
SourceArcticNet (ASM2013), programme; 2013 p. 193-194
Année2013
Séries alt.Secteur des sciences de la Terre, Contribution externe 20140010
Réunion9th ArcticNet Annual Scientific Meeting; Halifax, NS; CA; décembre 9-13, 2013
Documentlivre
Lang.anglais
Mediapapier; en ligne; numérique
Formatspdf
ProvinceNunavut
Lat/Long OENS-116.0000 -108.0000 69.0000 68.0000
Sujetsmilieu côtièr; études côtières; érosion côtière; gestion côtière; littoraux; variations du littoral; géologie de l'environnement; géologie marine
Programmeadaptation et impacts sur l'environnement, environnement du nord, Géosciences de l'environnement
LiensOnline - En ligne
Résumé(disponible en anglais seulement)
Coronation Gulf is located between Victoria Island and mainland Canada, and is within the Kitikmeot Region of Nunavut. The area is home to a number of communities and mining projects that include the development of ports and associated mining infrastructure (processing, accommodation and storage facilities) adjacent to the coast. Such activities can affect and be affected by coastal erosion and sedimentation processes. Studies of historical coastal change at key sites provide baseline data for environmental assessment of these critical areas. This project examined coastal change at two communities Kugluktuk and Cambridge Bay, two potential port sites at Grays Bay and Bathurst Inlet and one existing port site at Hope Bay. Historical air photos and more recent satellite imagery were used to assess coastal change for all five areas within the Coronation Gulf. Aerial oblique video were used to map the physical character of the coastline and to validate the coastal change results from historical photos.
In general the Coronation Gulf coastline is dominated by outcropping bedrock and unconsolidated glacially derived sediments and has remained relatively stable throughout the 60 year study period. However, areas with unconsolidated material can be actively mobile at select locations. The coastline surrounding the community of Kugluktuk has experienced the highest coastal change rate among the 5 study locations with an average retreat rate of 0.76 m/yr. However sections of the Kugluktuk shore to the west of town near the barge landing site are retreating more rapidly (1.2 m/yr) and are susceptible to drastic changes during coastal storms. Coastal change rates within Grays Bay are much less severe. This is partially attributed to the abundance of bedrock cliffs and the reduced impact of ocean waves on the coast line as the majority of the area is protected by Hepburn Island. Some sections of the Grays Bay coast have aggraded almost 50 meters since 1957. Bathurst Inlet, Hope Bay and Cambridge Bay are geographically protected from ocean waves and mobile ice and exhibit very low coastal change rates as a result. The shores along Hope Bay are the most stable with average change rates of 0.02 m/yr. However there does appear to be some localized accumulation of sediment at river mouths and adjacent to anthropogenic features like the port facility in Hope Bay.
This study provides an interesting prospective and comparison of coastal change at 5 key locations within Coronation Gulf. Knowledge of the magnitude and spatial variability of coastal change will enable stakeholders involved in the development of Coronation Gulf ports and communities to design appropriate infrastructure for the regional and local conditions. This will contribute to the viability of the mineral and energy industries in the Arctic and the well-being of residents in Nunavut.
Résumé(Résumé en langage clair et simple, non publié)
Le projet a examiné les changements côtiers dans deux communautés de Kugluktuk et Cambridge Bay, deux sites portuaires potentiels à Grays Bay et Bathurst Inlet et un site de port existant à Hope Bay. Des photos aériennes historiques et des images satellites plus récentes ont été utilisés pour évaluer l'évolution du littoral pour les cinq domaines dans le golfe Coronation. Un vidéo oblique aérienne ont été utilisés pour cartographier le caractère physique du littoral et de valider les résultats des changements côtiers de photos historiques. En général, la côte du golfe Coronation est dominé par des affleurements rocheux et des sédiments glaciaires et est resté relativement stable tout au long de la période d'étude de 60 ans. Cependant, les zones avec des matériaux non consolidés peuvent être érodé à certains endroits. Connaissance de l'ampleur et de la variabilité spatiale des changements côtiers permettra aux parties prenantes impliquées dans le développement des ports et des communautés du golfe Coronation à concevoir une infrastructure appropriée pour les conditions régionales et locales.
GEOSCAN ID293856