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| Titel |
PIV- and LDV-measurements of baroclinic wave interactions in a thermally driven rotating annulus |
| VerfasserIn |
Th. von Larcher, U. Harlander, Ch. Egbers |
| 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 |
250023733
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| Zusammenfassung |
| We present results of experiments in a rotating, baroclinic annulus of fluid. The apparatus is a
differentially heated cylindrical gap with a flat bottom topography and a free surface, rotated
around its vertical axis of symmetry, cooled from within, and filled with de-ionised water as
working fluid.
We used multivariate statistical techniques to understand better the variability of the
heated rotating flow (a) in the transition region between regular waves of different zonal
wave number, and (b) in the transition region to the quasi-chaotic regime. The former regime
is studied by applying the Complex Empirical Orthogonal Function (CEOF) method to
Particle-Image-Velocimetry (PIV) data, the latter by applying the Multi-Channel Singular
Spectrum Analysis (M-SSA) to Laser-Doppler-Velocimetry (LDV) data. In the
annulus, interactions between the dominant mode and so called weaker modes
can lead to low-frequency amplitude and wave structure vacillations. Our results
complement previous observations recovered primarily by thermocouple arrangements. |
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