GEOSCAN, résultats de la recherche


TitreHindcasting wave conditions in the Mackenzie delta using MIKE21
AuteurHoque, M A; Solomon, S; Perrie, W
Source43rd Canadian Metereological and Oceanographic Society (CMOS) Congress, Abstracts; 2009, 1 pages
Séries alt.Secteur des sciences de la Terre, Contribution externe 20080716
Réunion43rd Canadian Metereological and Oceanographic Society (CMOS) Congress; Halifax, Nova Scotia; CA; mai 31- juin 4, 2009
Mediaen ligne; numérique
ProvinceTerritoires du Nord-Ouest
SNRC107B; 107D
Lat/Long OENS-136.0000 -132.0000 70.0000 68.0000
Sujetsanalyse environnementales; etudes de l'environnement; effets sur l'environnement; glace; concentration de glace; mouvement de la glace; propagation des ondes; etudes des ondes de surface; tempêtes; dépôts de tempête; courants littoraux; milieu littoral; géologie de l'environnement; géologie marine; Nature et environnement
ProgrammeLes géosciences à l'appui de la gestion des océans
Résumé(disponible en anglais seulement)
Climate change is expected to cause greater ice-free open water areas for longer periods than at any time in recent history, with potential increases in storm-related processes in the Arctic Ocean. This can potentially lead to increased wave energy in the Canadian Beaufort Sea. Forecasting and hindcasting of wave conditions therefore becomes increasingly important, because storm-generated waves can impact the coast and seabed. These are major concerns for potential hydrocarbon exploration and infrastructure development in the Mackenzie Delta region of the Beaufort Sea. This study describes storm-generated wave hindcasting in Mackenzie delta using MIKE21 SW, a third generation spectral wave model based on unstructured grids. The model simulates the growth, decay and transformation of wind-generated waves and swells in shelf seas, coastal areas and lakes. Forcing fields are defined by winds, which vary in time and space, as produced by the Meteorological Service of Canada Beaufort (MSCB) wind reanalysis for the period 1985-2005. A fine resolution bathymetry is generated based on data from Canadian Hydrographic Service charts and NRCan field measurements. Measured water levels at Tuktoyaktuk are used as model input for storm surges. Moving boundaries of the ice edge during storms are incorporated. This is done by considering that the computational grid points with greater than 50% ice act as land points with no wave generation or propagation. Four storms (1985, 1987, 1991 and 2004) are simulated to evaluate the sensitivity of model physics and to account for the most important local effects in predicting nearshore waves in the study area. The study shows that the wave model predictions in shallow water are in good agreement with measured wave parameters when bottom friction and triad interactions are disregarded in model simulations. This might be due to the fact that the parameterizations used in the model have been tuned to environments which are very different from the shallow muddy bottom of the Mackenzie delta region.