Objective
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.
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Programme(s)
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Multi-annual funding programmes that define the EU’s priorities for research and innovation.
Topic(s)
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Calls for proposals are divided into topics. A topic defines a specific subject or area for which applicants can submit proposals. The description of a topic comprises its specific scope and the expected impact of the funded project.
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Funding Scheme
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Coordinator
64289 Darmstadt
Germany
The total costs incurred by this organisation to participate in the project, including direct and indirect costs. This amount is a subset of the overall project budget.