Computer Science
Scientific paper
Apr 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003eaeja.....4493l&link_type=abstract
EGS - AGU - EUG Joint Assembly, Abstracts from the meeting held in Nice, France, 6 - 11 April 2003, abstract #4493
Computer Science
Scientific paper
Recent observations have revealed high-frequency flow and mixing over a region of continental slope traversed by regularly spaced ridges and valleys (corrugations). Motivated by these observations, a series of numerical simulations examines the structure of the internal waves generated by tidal flow over such a corrugated slope. The dominant response to the cross-shelf component of tidal flow is a low mode internal tide propagating offshore from the shelf-break. Upon reflection from the corrugated slope, this internal tide generates scattered waves of higher mode number, which for sufficiently large tidal forcing can lead to shear instability and mixing. The scattered waves only appear when planetary rotation is taken into account, suggesting that the along-slope component of flow in the rotating internal wave is responsible, through interaction with the corrugations. Extension of existing theory of wave scattering from corrugations to include planetary rotation supports this conclusion. The along-slope barotropic tide generates internal waves on the length-scale of the corrugations when the flow is relatively weak. When the barotropic tide is stronger, highly nonlinear features such as internal hydraulic jumps downstream of the ridges are found, with associated overturning. The relaxation of these jumps leads to the development of solitary wave packets, which propagate up into the thermocline, where they may provide a source of shear for small scale mixing. The corrugations therefore play a vital role in the generation of shear and mixing by the interaction of the barotropic tides with the continentalslope.
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