Experimental observation of strong mixing due to internal wave focusing over sloping terrain |
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| Authors: | Arno Swart Astrid Manders Uwe Harlander Leo RM Maas |
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| Institution: | 1. RIVM - Centre for Infectious Disease Control, Laboratory for Zoonoses and Environmental Microbiology-LZO, P.O. Box 1 (internal mailbox 63), 3720 BA Bilthoven, The Netherlands;2. TNO Built Environment and Geosciences, Unit Environment, Health and Safety, P.O. Box 80015, 3508 TA Utrecht, The Netherlands;3. Department of Aerodynamics and Fluid Mechanics, Brandenburg University of Technology (BTU) Cottbus, Siemens-Halske-Ring 14, D-03046 Cottbus, Germany;4. Netherlands Institute for Sea Research, P.O. Box 59, 1790 AB Texel, The Netherlands;5. Institute for Marine and Atmospheric Research Utrecht, Buys Ballot Laboratorium, Princetonplein 5, 3584 CC, Utrecht, The Netherlands |
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| Abstract: | This paper reports on experimental observation of internal waves that are focused due to a sloping topography. A remarkable mixing of the density field was observed. This result is of importance for the deep ocean, where internal waves are believed to play a role in mixing. The experiments were performed on the rotating platform at the Coriolis Laboratory, Grenoble. The rotation, its modulation and density stratification were set to be in the internal wave regime. After applying various data processing techniques we observe internal wave rays, which converge to a limiting state: the wave attractor. At longer time scales we observe a remarkably efficient mixing of the density field, possibly responsible for driving observed sheared mean flows and topographic Rossby waves. We offer the hypothesis that focusing of internal waves to the wave attractor leads to the mixing. |
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| Keywords: | Mixing Internal waves Wave attractors Rotating stratified fluids Boundary layers Boundary layer eruptions |
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