Automated detection of coherent Lagrangian vortices in two-dimensional unsteady flows

Abstract

Coherent boundaries of Lagrangian vortices in fluid flows have recently been identified as closed orbits of line fields associated with the Cauchy-Green strain tensor. Here we develop a fully automated procedure for the detection of such closed orbits in large-scale velocity data sets. We illustrate the power of our method on ocean surface velocities derived from satellite altimetry.

17 pages, 6 figures, 1 table, accepted for publication in Proc. R. Soc. Lond., Ser. A

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