Objectif The overall goals of the project are to acquire a better understanding of the dynamic and kinematic processes relevant for nonlinear internal waves in lakes to quantify the physical processes controlling the transfer of energy within the internal wave field from large to small scales and to gain more knowledge on impact caused by wave mixing on the lake ecosystem. The processes to be studied are nonlinear steepening, disintegration and fission of basin-scale waves into solitary internal waves and wave trains; dynamics of internal waves in sites of underwater features and constrictions; transportation of energy, momentum and matter during the interaction of internal waves with lake boundaries (including wave overturning and breaking) - processes, which are basically responsible for driving the mixing in stratified lakes. Accordingly the objectives of this multidisciplinary project are grouped in five tasks:1. Data collection and analysis. The available data will be collected and processed to create a data base for theoretical and numerical studies. Two surveys in Lake Onega lake will be undertaken to study the dynamics of short-period nonlinear waves.2. Laboratory modelling of nonlinear transformation and degeneration of long internal waves in stratified lakes. Laboratory investigations will be carried out to study transformation of interfacial internal waves at irregularities of the bottom, constrictions of boundaries and degeneration and reflection waves from sloping boundaries.3. Theoretical studies of processes of energy transfer from long internal waves to the small scales. Analytical solutions for schematic processes based on nonlinear evolution equations like the Korteweg-de Vries and Boussinesq equations will be derived. The simplified Boussinesq-like models for internal waves will be developed. 4. Improvement and validation of numerical nonhydrostatic models for lakes. The 2D and 3D model will be improved and validated using the analytical solutions and laboratory experiments.5. Numerical simulations of the degeneration of basin-scale waves and wave enhanced mixing in lakes. Numerical simulation of the energy-transfer processes based on the developed Boussinesq-like models of internal waves, 2D and 3D non-hydrostatic models will be carried out by IAP, IMMSP, UP with support from TUD and NWPI. Parameterisation of mixing caused by internal waves will be considered.Expected results from this project are a better understanding of the energy-flow path from the wind to the basin-scale internal waves, and then to shorter solitary waves and turbulence in the benthic boundary layer. As a result, this knowledge will improve the prediction of the still insufficiently known influence of internal waves on the environment of lakes, which are more important from the viewpoint of human activity and biological productivity. Parameterisations of mixing by internal waves will be implemented into the hydrodynamic modules of the ecosystem models. Programme(s) IC-INTAS - International Association for the promotion of cooperation with scientists from the independent states of the former Soviet Union (INTAS), 1993- Thème(s) OPEN - OPEN Call Appel à propositions Data not available Régime de financement Data not available Coordinateur Technical University Darmstadt Contribution de l’UE Aucune donnée Adresse Hochschulstr. 1 64289 Darmstadt Allemagne Voir sur la carte Coût total Aucune donnée Participants (5) Trier par ordre alphabétique Trier par contribution de l’UE Tout développer Tout réduire National Academy of Sciences of Ukraine Institute of Hydrodynamics Ukraine Contribution de l’UE Aucune donnée Adresse Zheliabov 8/4 03057 Kiev Voir sur la carte Coût total Aucune donnée National Academy of Sciences of Ukraine Institute of Mathematical Machine and System Problems Ukraine Contribution de l’UE Aucune donnée Adresse Glushkov str. 42 03187 Kiev Voir sur la carte Coût total Aucune donnée Russian Academy of Sciences Institute of Applied Physics Russie Contribution de l’UE Aucune donnée Adresse Uljanov Street 46 603950 Nizhny Novgorod Voir sur la carte Coût total Aucune donnée Russian Academy of Sciences Karelian Scientific Centre, Northern Water Problems Institute Russie Contribution de l’UE Aucune donnée Adresse Aleksander Nevsky str. 50 185003 Petrozavodsk Voir sur la carte Coût total Aucune donnée UNIVERSITY OF PLYMOUTH Royaume-Uni Contribution de l’UE Aucune donnée Adresse DRAKE CIRCUS PLYMOUTH Voir sur la carte Coût total Aucune donnée
