| title: | Topographic waves, the variability of the surface currents and the water and matter exchange in the Gulf of Finland |
|---|---|
| reg no: | ETF5869 |
| project type: | Estonian Science Foundation research grant |
| subject: |
1.16. Marine Sciences and Limnology |
| status: | accepted |
| institution: | TTU Marine Systems Institute |
| head of project: | Lembit Talpsepp |
| duration: | 01.01.2004 - 31.12.2007 |
| description: | The aim of the project is to interprete the variabilitity of surface currents with periods of 2-4 days using the model of topographic waves. This variability is influencing the water and Matter exchange between Gulf of Finland and North-Estonian bays. Assumption: In 1994-97 the variabilty of currents that does not come out in numerical models was measured (Andrejev, 2003). Hypothesis: These phenomena are topographic waves that are filtered out due to instability reasons. To work out the model of topographic waves for the continously stratified water, we must first study separately the roles of continuous stratification, bottom topography and the mean flow. We will achieve this aim using of simpler models that study the separate effect only. The final aim is to work out a model that takes into account the effects of stratification, topography and the mean flow in spite of the fact that up to now the existence of mean flow in model with continous (not layered) stratification complicates the model solution. Above all the model is intended to be used for three series of current measurements at mouth of bays of Gulf of Finland (GF). One most important thing is to compare the vertical profile of currents obtained from model as superposition of different wave modes and that from measurements because this current profile is most important factor in water and matter exchange in different water layers. We plan to inventarize most current measurements carried out in earlier years that are not available for use. We intend to analize this data base using statistical and spectral methods to study the low-frequency wave properties of current measurements. In the second stage we plan to use model for explaining some spatial distributions of cynobacteria and phytoplankton measured earlier. We also use the model as an addition to the models of general circulation to explain the measured variabilty that does not come out while using general numerical models of GF. |
| project group | ||||
|---|---|---|---|---|
| no | name | institution | position | |
| 1. | Tarmo Kõuts | TTÜ MSI | vanemteadur | |
| 2. | Kai Künnis | TPÜ ÖI | teadur | |
| 3. | Juss Pavelson | TTÜ MSI | teadur | |
| 4. | Lembit Talpsepp | TTU Marine Systems Institute | senior scientist | |