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TitleCoastal geoscience field work near Iqaluit, Nunavut, 2009-2011
AuthorHatcher, S V; Forbes, D L; Manson, G K
SourceGeological Survey of Canada, Open File 7653, 2014, 65 pages,
PublisherNatural Resources Canada
Documentopen file
Mediaon-line; digital
File formatpdf
ProvinceNunavut; Northern offshore region
NTS25N/09; 25N/10
AreaIqaluit; Frobisher Bay; Cemetery Beach; Apex Beach; Koojesse Inlet
Lat/Long WENS-68.6167 -68.5500 63.7500 63.7167
Subjectsmarine geology; geophysics; sedimentology; coastal studies; coastal environment; coastal management; tidal flats; tidal environments; tidal deposits; erosion; geophysical surveys; side-scan sonar; field work
Illustrationslocation maps; plots
ProgramCoastal Infrastructure, Climate Change Geoscience
Released2014 12 24
AbstractThis report describes data collected during five field trips to Koojesse Inlet, Nunavut, between 2009 and 2011. These trips have expedition numbers 2009306, 2010307, 2011303, and 2011307 (includes 2 trips). Koojesse Inlet is in the northwestern end of Frobisher Bay on Baffin Island. Data were collected primarily on foot within the intertidal, but there are some boat-based datasets associated with expedition 2011307. Data collected include: RTK-GPS transects, sidescan sonar lines, single beam sonar lines, tide and wave recorder deployments, current profiler deployments, surface and grab sediment samples, underwater drop camera lines, and shallow sub-bottom profile lines. Results
show a complex intertidal zone characterized by a higher slope beachface and ank face at the edge of the low-slope tidal at terrace, with varying concentrations of boulders. Sediment is a mixture of relict glaciomarine overlain by a shallow reworked sand/mud surficial layer. Sediment in the nearshore varies from fine silts to cobble/gravel deposits in the more exposed areas. This study was unable to resolve significant amounts of erosion on the tidal at surface, but the geomorphological evidence is irrefutably indicative of an erosional landform.
Summary(Plain Language Summary, not published)
Knowledge about macrotidal tidal flats comes mainly from studies in temperate regions, but the inclusion of sea ice in the Arctic means things look and behave differently. A better understanding of Arctic tidal flats may help communities adapt to projected changes. This study builds on past work that described the morphology and dynamics of the Iqaluit tidal flats, in an area of 12 m tidal range at Iqaluit, Baffin Island. We undertook field surveys and instrument moorings in summer and winter over 3 years (2009-2011). The Iqaluit waterfront is formed by storm beaches fronted by wide intertidal mud and sand boulder flats underlain by glaciomarine clay-silt sediments. It appears that the flats are being actively eroded by a number of processes, including ice push and rafting, tidal currents, surface runoff, and submarine slumping along the edge of the flats.