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| Titel |
Experimental Study of Internal-Tide Scattering by 2D Topography |
| VerfasserIn |
M. Mercier, T. Peacock, T. Dauxois |
| Konferenz |
EGU General Assembly 2009
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250024543
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| Zusammenfassung |
| Scattering of internal tides is an important mechanism to understand energy transfer in the
ocean. Numerical [1] and oceanographic [2] studies have shown that topography can be
responsible for conversion from low to high modes, thereby transferring energy from larger to
smaller scales.
To understand and quantify more precisely low-to-high mode scattering by topography,
we performed a series of experiments in which we generated a mode-1 internal tide using a
new configuration for the wavemaker recently developed by Gostiaux et al. [3]. The
experiments used PIV to visualize the wave field and took place on the Coriolis Turntable in
Grenoble (France). We first studied the free evolution of the internal tide, in order to check its
monochromaticity and vertical structure. Thereafter, we analyzed the interaction of the
internal tide with idealized 2D topographies (knife-edge, gaussian bump) using modal
decomposition techniques.
[1] T. M. S Johnston & M. A. Merrifeld, Internal Tide Scattering at the Line Islands
Ridge, J. Geophys. Res. (2003), 108:3180.
[2] R. D. Ray & G. T. Mitchum, Surface Manifestation of Internal Tides in the
Deep Ocean: Observations from Altimetry and Island Gauges, Prog. Ocean. (1997),
40:135–162.
[3] L. Gostiaux, H. Didelle, S. Mercier & T. Dauxois, A Novel Internal Waves Generator,
Exp. in Fluids (2007), 42:123—130. |
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