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| Titel |
Passive tracer patchiness and particle trajectory stability in incompressible two-dimensional flows |
| VerfasserIn |
F. J. Beron-Vera, M. J. Olascoaga, M. G. Brown |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1023-5809
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| Digitales Dokument |
URL |
| Erschienen |
In: Nonlinear Processes in Geophysics ; 11, no. 1 ; Nr. 11, no. 1 (2004-02-25), S.67-74 |
| Datensatznummer |
250009024
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| Publikation (Nr.) |
 copernicus.org/npg-11-67-2004.pdf |
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| Zusammenfassung |
Particle motion is considered in incompressible two-dimensional
flows consisting of a steady background gyre on which an unsteady
wave-like perturbation is
superimposed. A dynamical systems point of view that exploits the
action-angle formalism is adopted. It is argued and demonstrated
numerically that for a large class of problems one expects to observe a
mixed phase space, i.e. the occurrence of "regular islands" in an
otherwise "chaotic sea". This leads to patchiness in the evolution of
passive tracer distributions. Also, it is argued and demonstrated
numerically that particle trajectory stability is largely controlled by the
background flow: trajectory instability, quantified by various measures of
the "degree of chaos", increases on average with increasing
 , where  is
the angular frequency of the trajectory in the background flow and
I is the action. |
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