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akadeemia kirjastus
Estonian Journal of Engineering

The use of high-resolution bathymetry for circulation modelling in the Gulf of Finland; pp. 187–210

Full article in PDF format | doi: 10.3176/eng.2010.3.01

Oleg Andrejev, Alexander Sokolov, Tarmo Soomere, Rolf Värv, Bert Viikmäe

We present preliminary results of the extension of the OAAS circulation model to a high-resolution bathymetry with a finest resolution of 0.25 nautical miles in the Gulf of Finland, the Baltic Sea. The models with a resolution of 1 mile or finer are capable of resolving typical mesoscale eddies in this basin where the internal Rossby radius is usually 2–4 km. An increase in the model resolution from 1 to 0.5 NM leads to a clear improvement of the representation of the key hydrophysical fields. A further increase in the resolution to 0.25 NM has a lesser impact on hydro­physical fields, but may lead to some changes in the instantaneous patterns of currents. The para­meterization of the spreading effect of sub-grid-scale turbulence on the trajectories of initially closely located drifters is realized by means of accounting for the largely rotational character of the dynamics in this basin. The modelled average spreading rate for initially closely located particles for 1991 was 2 mm/s.

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