Monday, May 19

10:00 AM-12:00 PM Magpie A & B - Level B

Diffusion and Turbulence on Water Surfaces

The purpose of the minisymposium is to focus on the motion of particles, floats, and drifters on a turbulent water surface. Results obtained for the self-diffusivity by tracking drifters in the ocean and for the relative diffusivity by tracking pairs of drifters all show that the motion is far from being Brownian. In the geophysical dynamical regime, at time scales between roughly 1 day and 10 days and length scales between roughly 10 km and 100 km, the drifter motion possesses significant persistence (`memory'), which is not present in ordinary Brownian motion. A similar persistence is observed in laboratory experiments, where turbulent surface waves are formed and sustained by external forcing. Also here measurements of self-diffusivity and relative diffusivity of floating particles reveal a non-Brownian motion.We wish to compare the results from upper-ocean studies with those from laboratory experiments and with related theoretical results for wave turbulence.

Organizer: Preben Alstrom
Niels Bohr Institute, Denmark

10:00 Drifter Trajectories in Geophysical Flows
Antonello Provenzale, Istituto di Cosmogeofisica, Italy
10:30 Motion of Floating Particles on a Turbulently Driven Fluid
Walter I. Goldburg and Cecil Cheung, University of Pittsburgh
11:00 Particle Motion in Capillary Surface Waves
Preben Alstrom, Organizer; Mogens T. Levinsen and Elsebeth Schröder, Niels Bohr Institute, Denmark

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TMP, 3/18/97