Conférences plénières
Geodesic Transport Barriers in the Ocean and the Atmosphere
Haller, George
Institute for Mechanical Systems ETH Zurich, Switzerland

Transport barriers organize material distribution, pattern formation, and transport pathways in moving continua, ranging from planar steady flows to three-dimensional turbulence. There is a pressing need to identify such barriers objectively in geophysical flow data. Applications include tracking environmental contamination, forecasting clear-air turbulence for airports, and quantifying long-range eddy transport for climate-change predictions. Here we describe an emerging mathematical theory of transport barriers that provides an extension of well-known invariant sets in simple dynamical systems to complex, finite-time continuum dynamics. We also show how this approach accurately uncovers barriers in time-resolved oceanic and atmospheric data sets.

Lundi, 17 juin, 08h30
Salle Des Plaines