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TitreExposure to coastal hazards in a rapidly expanding northern urban centre, Iqaluit, Nunavut
AuteurHatcher, S V; Forbes, D L
SourceArctic vol. 68, no. 4, 2015 p. 453-471, https://doi.org/10.14430/arctic4526
Année2015
Séries alt.Secteur des sciences de la Terre, Contribution externe 20140457
ÉditeurArctic Institute of North America
Documentpublication en série
Lang.anglais
DOIhttps://doi.org/10.14430/arctic4526
Mediapapier; en ligne; numérique
Formatspdf
ProvinceNunavut
SNRC25N/15; 25N/16; 25N/09; 25M/13; 25M/12
Lat/Long OENS -68.5667 -68.4333 63.7667 63.7333
Sujetsplanification; planification urbaine; changements du niveau de la mer; inondations; climat arctique; effets climatiques; gestion côtière; affaissement; Infrastructure
Illustrationsphotographs; location maps; aerial photographs; tables
ProgrammeInfrastructure côtière, Géosciences de changements climatiques
Résumé(disponible en anglais seulement)
The City of Iqaluit, Nunavut, is an expanding urban centre with important infrastructure located in the coastal zone. Practitioners and decision-makers in Iqaluit recognize the need for adaptation planning to respond to environmental change, and the value of scientific knowledge to support sustainability goals. The purpose of this study is to investigate coastal hazards to infrastructure based on past trends, current exposure, and projections of environmental change. Using a combined terrestrial and intertidal digital elevation model derived from satellite imagery and field surveys, we model the inundation resulting from projected sea-level rise. Some public and private infrastructure is already subject to flooding in extreme high-water events. Using a near upper-limit scenario of 0.7 m for relative sea-level rise from 2010 to 2100, key municipal infrastructure will have a remaining freeboard of 0.3-0.8 m above high spring tide, and some 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 icefoot provides protection for coastal infrastructure, except where development artificially steepens the coast. The ice-free season has been lengthening by 1.0-1.5 days/yr since 1979, increasing the opportunity for storm wave generation and thus the exposure to wave runup. Overtopping of critical infrastructure is a potential issue, dependent largely on the magnitude of relative sea-level change and the changing probability of storm waves and extreme high-water events. These results can inform decisions on adaptation, providing measurable limits for safe development.
Résumé(Résumé en langage clair et simple, non publié)
Iqaluit est une communauté côtière du nord qui s'agrandit rapidement, avec l'expansion d'infrastructure sur le littoral. Des inondations côtières se sont déroulées dans le passé and la hausse du niveau de la mer augmente le risque d'inondation. D'autres risques littoraux comprennent des impacts de la glace de mer et des vagues. L'extension de la saison sans glace incrémente le niveau potentiel de l'atteinte des vagues. Il existe actuellement de l'infrastructure exposée à l'inondation au cours des évènements extrêmes et l'exposition est prévue d'augmenter dans le futur.
GEOSCAN ID295850