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TitleCoastal geoscience for sustainable development in Nunavut: 2013 activities
AuthorCouture, N JORCID logo; Craymer, M RORCID logo; Forbes, D LORCID logo; Fraser, P R; Henton, J AORCID logo; James, T SORCID logo; Jenner, K A; Manson, G K; Simon, K M; Siliker, R J; Whalen, D J R
SourceSummary of Activities 2013, Canada-Nunavut Geoscience Office; Canada-Nunavut Geoscience Office, Summary of Activities 2013 p. 139-148 Open Access logo Open Access
LinksOnline - En ligne[PDF,5.42MB]
Alt SeriesEarth Sciences Sector, Contribution Series 20130277
PublisherCanada-Nunavut Geoscience Office
File formatpdf
NTS86O/14; 76M/14; 76M/15; 76N/01; 77A/04; 77D/02; 66A/08
AreaCoronation Gulf; Kugluktuk; Coppermine delta; Iqaluit; Baker Lake; Cambridge Bay; Bathurst Inlet; Hope Bay
Lat/Long WENS-117.0000 -102.0000 69.5000 66.5000
Lat/Long WENS -96.5000 -96.0000 64.5000 64.2500
Subjectsmarine geology; Nature and Environment; coastal studies; coastal environment; coastal erosion; coastal management; sea level changes; sea level fluctuations
Illustrationslocation maps; aerial photographs; plots
ProgramClimate Change Geoscience
Released2013 01 01
AbstractNatural Resources Canada scientists and partners are assessing coastal conditions at various sites in Nunavut to help determine coastal stability and predict future changes. Mapping of coastal landforms and material composition has been carried out for over 2500 km of coastline in southern Coronation Gulf. Coastal stability was assessed at an existing mining port facility (Roberts bay) and a planned one (Grays Bay).Results indicate that the shoreline at Roberts bay is relatively stable, although there is some sedimentation at the mouth of one river, and some erosion of ice-rich backshore cliffs. The coast around Grays Bay also shows little overall change due to the predominance of bedrock in the region. However, there are pockets where erosion is occurring and areas where progradation has occurred. A preliminary investigation shows that a method developed for the mapping of bottom-fast ice (BFI) in the Mackenzie Delta, using synthetic aperture radar imagery,
an be successfully applied to identify BFI in the Coppermine River delta as well. Data indicative of past relative sea level
ere collected from 18 sites around the hamlet of Arviat and, together with previously published observations,were used to determine a regional Holocene sea-level curve. This information, together with results from a Global Positioning System (GPS) site near the hamlet, shows present-day crustal uplift of just under 10 mm/yr. Two new continuous GPS sites were installed at Ennadai Lake and Repulse Bay to measure vertical crustal motion. An improved model of vertical crustal motion is being developed that will assist with making projections of relative sea-level change in the territory.
Summary(Plain Language Summary, not published)
The coastline was examined at various locations around Nunavut to see whether it is eroding, and how it might be affected by climate change. Over 2500 km were mapped along the Coronation Gulf coast to determine where it is rocky and the form it takes (i.e., beach, cliff, etc.). Air photos and satellite images were compared for two port sites (Roberts Bays and Grays Bay) to see how much erosion has occurred over 60 years. Results show that the coast around Roberts Bay is mostly stable, although some ice-rich cliffs are eroding. There is little erosion around Grays Bay since much of the coast is bedrock, but there are still small pockets of erosion. Satellite images were used near Kugluktuk to locate areas where bottom-fast ice (BFI) forms in winter. BFI only forms in shallow channels so knowing this helps in navigation. Long-term GPS measurements are used to determine how quickly the Earth's crust is moving up or down and to help predict how sea level may change in the future.

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