| Titre | Numerical Modelling of Seabed Disturbance and Sediment Mobility, and Implications to Morphodynamics on the Storm-dominated Sable Island Bank, Scotian Shelf |
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| Auteur | Li, M Z ; Zou, Q;
Hannah, C; Perrie, W; Prescott, R; Toulany, B |
| Source | 2008 Ocean Sciences Meeting, from the watershed to the global ocean, book of abstracts; 2008 p. 1 |
| Liens | 2008 Ocean Sciences Meeting
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| Image |  |
| Année | 2008 |
| Séries alt. | Secteur des sciences de la Terre, Contribution externe 20070551 |
| Réunion | 2008 Ocean Sciences Meeting; Orlando, FL; US; mars 2-7, 2008 |
| Document | livre |
| Lang. | anglais |
| Media | en ligne; numérique |
| Province | Région extracotière de l'est |
| SNRC | 10N/16; 10O/13; 11N/04 |
| Région | Sable Island Bank; Scotian Shelf |
| Lat/Long OENS | -61.5000 -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; géologie
marine; sédimentologie |
| Programme | Les géosciences à l'appui de la gestion des océans Aléas géologiques et contraintes à la mise en valeur des ressources extracôtières |
| Diffusé | 2008 01 01 |
| 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. |
| GEOSCAN ID | 224812 |
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