| Titre | Numerical modelling of seabed disturbance and sediment mobility, with applications to morphodynamics on the storm-dominated Sable Island Bank, Scotian Shelf |
| Télécharger | Téléchargements |
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| Licence | Veuillez noter que la Licence du gouvernement
ouvert - Canada remplace toutes les licences antérieures. |
| Auteur | Li, M Z ; Zou, Q;
Hannah, C; Perrie, W; Prescott, R; Toulany, B |
| Source | Commission géologique du Canada, Dossier public 6155, 2009, 1 feuille, https://doi.org/10.4095/247853  Accès ouvert |
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| Année | 2009 |
| Éditeur | Ressources naturelles Canada |
| Document | dossier public |
| Lang. | anglais |
| DOI | https://doi.org/10.4095/247853 |
| Media | papier; en ligne; numérique |
| Formats | JPEG2000; pdf |
| Province | Région extracotière de l'est |
| Région | Sable Island Bank; Scotian Shelf |
| Lat/Long OENS | -62.0000 -59.0000 44.5000 43.2500 |
| Sujets | milieux de marée; marées; courants de marée; distribution des sédiments; transport des sediments; milieu sédimentaire; sédimentation; dynamique sédimentaire; propagation des ondes; courants; levés
géophysiques; bathymétrie; géologie marine; sédimentologie |
| Illustrations | cartes de localisation; images |
| Programme | Les géosciences à l'appui de la gestion des océans Aléas géologiques et contraintes à la mise en valeur des ressources extracôtières |
| Diffusé | 2009 09 08 |
| Résumé | (disponible en anglais seulement)
Waves, tidal currents, wind-driven and circulation currents, and sediment mobility were modelled for one full year over the storm-dominated Sable Island Bank
(SIB), Scotian Shelf. The mean shear velocity of tidal current and that of the wind-driven and circulation current are less than 2 cm/s, but the peak mean wave and combined wave-current shear velocities reach 4 and 4.5 cm/s respectively. Comparison
between the model-predicted shear velocity and bedload threshold suggests that the circulation and wind-driven currents cause minimum sediment mobility on SIB. Tidal current and waves can each cause sediment mobility at least once a year over 36% and
71% of the bank area respectively, while the combined wave-current shear can cause sediment mobility over 93% of the bank area. Calculated time percentages of sediment mobility caused by various processes indicate that wave or wave-dominant
disturbance is most important and occurs over >50% of the bank area, while mixed disturbance is also significant and occurs over ~ 30% of the bank area. Tide or tide-dominant disturbance occurs over only 10% of the bank area. Several parameters are
proposed as universal indices for quantifying seabed disturbance and sediment mobility for coastal and shelf environments.This distribution and mobility of various mid-sized bedforms were correlated with the seabed disturbance parameters. Updated
bedform distribution was compared with seabed disturbances predictions to define seven bedform zones on SIB. |
| GEOSCAN ID | 247853 |
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