European Science Foundation Programme on Transport in Atmospheres and Oceans Workshop:

Wednesday October 29 - Saturday November 1, 1997

at Optics and Fluid Dynamics Department, Risø

Organizer: Jens Juul Rasmussen

Programme:

**Wednesday October 29, 1997 **

09.00-10.00 Registrations

10.00-10.30 Opening remarks

J.-P. Lynov: Introduction to Risø

10.30-11.15 G. J. F. van Heijst: Advection properties of perturbed
and interacting vortices

11.15-11.40 Coffee

11.40-12.25 J. Weiss: Coherent vortices in three dimensional quasi-geostrophic
turbulence

12.30-13.30 Lunch

13.30-14.15 J. Nycander: Vortex dynamics on the beta-plane

14.15-15.00 R. Pasmanter: Critical review of statistical-mechanical approach
to quasi-stationary states in 2D flows

15.00-15.30 Coffee

15.30-16.00 H. Brands: Maximum entropy versus minimum enstrophy predictions for 2D,
incompressible, nearly inviscid flows, evolving from large scale
initial structures

16.00-16.30 Preben Alstrøm: Fractal particle trajectories in capilary
waves

16.30-17.15 Discussions on the day's theme. Planning the following discussions

17.15 Get together beer

**Thursday October 30, 1997 **

09.00-09.45 R. Verzicco: Dynamics of a vortex ring in a rotating environment

09.45-10.30 H. Clercx: Quasi - 2D vortex dominated flows in containers
with rigid boundaries

10.30-10.55 Coffee

10.55-11.40 J. Weiss: Lagrangian dynamics in a system of point vortices

11.40-12.25 A. H. Nielsen: Particle transport across a circular shear layer
with coherent structures

12.30-13.30 Lunch

13.30-14.00 O. Ben Mahjoub: Scaling exponents in nonhomogeneous flow

14.00-14.30 I. Mortazavi: Study of vorticity formation and transport in
confined flows using vortex methods

14.30-15.00 V. Naulin: Numerical study on global and local influence of
structures in a 2D flow on particle transport

15.00-15.20 Coffee

15.20-17.30 Laboratory visit, discussions

**Friday October 30, 1997 **

Theme: Laboratory experiments

09.00-09.45 D. Etling: Dispersion of passive tracers due to a vortex pair in
stratified flows

09.45-10.30 Y. Chashechkin: Coherent vortex structures in a 2D stratified wake as transport
barriers (short and long time inspection) - some theoretical basis
and laboratory experiment

10.30-10.55 Coffee

10.55-11.40 J. Konijnenberg: Vortex structures and particle transport in a shear
layer in 2D quasi-geostrophic flows

11.40-12.25 P. Petitjeans: Experiment on vortex stretching

12.30-13.30 Lunch

13.30-14.00 B. Stenum: Collapse of a vortex ring in a stratified fluid

14.00-14.30 M. Beckers: Axisymmetric vortex motion in a linearly stratified
fluid

14.30-15.00 A Stegner: Dynamical behavior of large-scale vortices beyond the
deformation radius

15.00-15.30 A. E. Hansen: Two-dimensional turbulence and dispersion in a
freely decaying system

15.30-16.00 Coffee

16.00-17.30 Discussions

**Saturday October 31, 1997 **

09.30-10.15 T. Mikkelsen: Atmospheric dispersion: Field measurements and
analysis

10.15-11.00 H. Lustfeld: A 2D model for chemical reactions due to a
pollutant source

11.00-11.30 Coffee

11.30-12.15 N. Edwards: Equatorial Pacific eddies in a numerical ocean model

12.20-13.30 Lunch

13.30-14.00 M. Schmidt: Particle dispersion in monopolar structures in
quasi-geostrophic flows

14.00-14.30 V. Wirth: Coherent tropopause structures?

14.30-15.00 Coffee

15.00-16.30 Discussions, final discussion, closing

19.00 Dinner