Contributions by speaker > Chassagne Rémi

On the fate of topographically-trapped internal tides
Rémi Chassagne  1@  , Frédéric Cyr  2, *@  , Leo Maas  3, *@  , Andrea Cimatoribus  4@  , Hans Van Haren  4, *@  , Daniel Bourgault  5@  
1 : Ecole Nationale Supérieure de Techniques Avancées ParisTech  (ENSTA ParisTech)  -  Website
ENSTA ParisTech
828 Boulevard des Maréchaux, 91120 Palaiseau, France -  France
2 : Royal Netherlands Institute for Sea Research -NIOZ (NETHERLANDS)
3 : Royal Netherlands Institute for Sea Research - NWO (NETHERLANDS)
4 : Royal Netherlands Institute for Sea Research  (NIOZ)  -  Website
5 : Institut des sciences de la MER de Rimouski - ISMER (CANADA)  (ISMER)  -  Website
310, allée des Ursulines Rimouski, QC, G5L 3A1 -  Canada
* : Corresponding author

The Rockall bank (N-E Atlantic ocean) is known for hosting topographically-trapped diurnal tides that propagates anti-cyclonally around the bank. A recent mooring deployment in this area highlighted a diurnal succession of large amplitude ( 0 (10^2m) ) internal bores propagating upslope onto the bank. Breaking of freely propagating internal tides (such as f < omega < N ) are well known to generate such motions. But because the main barotropic tide there is diurnal, our study focuses on one specific case of internal tide where omega < f < N. The results of an analytical mpodel and of a 2D non-hydrostatic model are presented. Results show that the trapped barotropic wave (or Edge wave) alone is sufficient to generate such internal waves. It is also shown that the internal waves generated by these motions cannot escape from the topography, raising questions about where the energy goes.



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