Generation of internal waves over a shelf |
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| Affiliation: | 1. Department of Earth and Environmental Sciences, University of Michigan, Ann Arbor, USA;2. Department of Atmospheric and Oceanic Sciences, McGill University, Montreal, H3A 0B9 CAN, USA;3. Oceanography Division, Naval Research Laboratory (NRL-SSC), Stennis Space Center, Mississippi, USA;4. NOAA/Geophysical Fluid Dynamics Laboratory, Princeton, New Jersey, USA;5. Physical Oceanography Department, Woods Hole Oceanographic Institution, Woods Hole, USA;1. Division of Marine Science, The University of Southern Mississippi, Stennis Space Center, MS, USA;2. Center for Ocean-Atmospheric Prediction Studies, Florida State University, Tallahassee, FL, USA;3. Oceanography Division, Naval Research Laboratory, Code 7323, Stennis Space Center, MS, USA;4. Department of Earth and Environmental Sciences, University of Michigan, Ann Arbor, MI, USA;1. LEGOS, University of Toulouse, CNES, CNRS, IRD, UPS, Toulouse 31400, France;2. LA, University of Toulouse, CNRS, Toulouse 31400, France |
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| Abstract: | Experiments are performed in a 13-m cylindrical tank to study the generation of interfacial internal waves by barotropic sinusoidal waves passing over a slope. At each tidal cycle, there are two waves generated, one propagating onshore and the other propagating offshore. The amplitude of the waves increases with increasing forcing and evolves as nonlinear waves if the shelf width is smaller than the wavelength of the baroclinic tide. Rotation does not modify the generating mechanism but the amplitude of the generated waves decreases with increasing rotation rate; also no internal waves are generated when the forcing period is larger than the inertial period, and at high rotation rate, there are only dispersive waves propagating from the shelf break region. The experiments covered a large range of internal Froude number, Rossby number and temporal Rossby number and compare well with in situ observations. |
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