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Period: 1997-05-05 - 1997-05-09
Location: Liège, Belgium
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- Université de Liège; GeoHydrodynamics and Environmental Research group (GHER), more, organiser
Almost twenty years after the 11th Liège Colloquium on "Turbulence in the ocean. From the millimeter to the megameter" and ten years after the 19th Colloquium on "Small-scale turbulence and mixing in the ocean", it seems appropriate to devote again one of the Liège Colloquia to the subject of marine turbulence.
In the last decade, with in particular the development of sophisticated new techniques of measurements, substantial progresses have been made in understanding marine turbulence while, in the same time, uncovering more of its complexity.
The development of 3D turbulent closure mathematical models, extended from hydrodynamics to include the dynamics of ecosystems, has emphasized the role of turbulence as one of the cogent driving mechanisms of most of the physical processes deeply affecting the distribution and evolution of biological populations. A good parameterization of the effects of turbulence in such models can only be achieved via a continuously improved knowledge of the nature and characteristics of turbulence in the various conditions of the intricated marine environment.
Turbulence in the lower mesoscale range (motion with relative vorticity approaching the Coriolis frequency) has an important effect on the distribution of biological population, the formation or dispersion of patches and such biological factors as the availability of food, the encounter rates between preys and predators...
Small-scale turbulence directly influences behavioural functions of marine organisms (techniques of feeding, perception of signals, reproduction...) and its presence or its absence is often a selecting factor between species.
It is hoped that revisiting marine turbulence at the 29th International Liège Colloquium on Ocean Hydrodynamics will provide an opportunity to
- bring up to date, as much as possible, our understanding of marine turbulence and in particular lower mesoscale turbulence which was not adequately covered in our preceding meetings but has been the object of much interest since then and small-scale turbulence very near the sea surface where the role of wave breaking, bubbles, surface films and Langmuir cells make a rather complex picture one begins only to comprehend fully;
- bring together scientists from different disciplines to assess what we know about the effects of turbulence on biological populations at the levels of both the organisms and the shoals and patches;
- reexamine critically the parameterization of turbulence in 3D turbulent closure models and the improvements that could be made to such models to provide the most realistic ecohydrodynamics simulations of the marine environment.