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Zawartość zarchiwizowana w dniu 2022-12-23

Dynamics of internal waves in moving and rotating fluids: laboratory experiments, numerical modelling and theoretical estimations

Cel



The main goal of this project is to investigate theoretically, numerically and by means of laboratory experiments, the fundamental properties of non-linear waves in rotating ocean as well as the dynamics of mesoscale non-linear waves in seas and oceans with shear flows. While large-scale waves (e.g. Rossby waves) as well as small-scale motions (short thermocline and bulk waves ) have been thoroughly investigated, the intermediate range of the internal wave (from a few kilometres to a few dozen kilometres), has mostly been described empirically (in the Garrett-Munk spectrum).

This project deals mainly with this range for which the effects of rotation and non-hydrostatic dispersion are equally important in principle. This class of waves is known to possess a well expressed non-linearity and, at the same time, to carry a significant part of the internal wave energy in the ocean, especially in marginal zones of it. Thus the internal wave solitons, created by the barotropic tide on the shelf edge, are usually influenced by rotation at moderate latitudes. It is also quite possible that these waves, due to prominent currents associated with them, play a significant role in the bottom sediment formation and biological processes in near-shelf zones.

A synergetic approach will be used in the study, based on all three components of the investigation mentioned above. The characteristic peculiarity of the project consists of the use of two unique large laboratory basins: a rotating platform Coriolis with a water tank of 14m diameter and a depth of 1.5m and two large thermo-stratified laboratory tanks (20 m x 4 m x 1.6 m and 5.5 m x 2.0 m x 1.2 m) with acting systems of shear flow producing (current inductors).

Within the framework of the co-operation investigations will be focused on the following specific key issues: investigation of steady periodic and solitary non-linear waves in rotating and moving fluids; dynamics of periodical and solitary perturbations in moving fluids; and investigation of the shear flow influence on the thermocline and internal wave parameters as well as the interaction of internal waves with shear flows and turbulence.

The expected results will clarify the important role of the Earth's rotation in the dynamics of long non-linear waves and the influence of shear flows on the formation of the ocean thermocline and internal wave parameters.

Zaproszenie do składania wniosków

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System finansowania

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Koordynator

Université Joseph Fourier Grenoble
Wkład UE
Brak danych
Adres

38041 Grenoble
Francja

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Koszt całkowity
Brak danych

Uczestnicy (4)