Avtandil KORDZADZE, Demuri DEMETRASHVİLİ

Coastal Forecasting System for the Easternmost Part of the Black Sea

A coastal forecasting system for the Easternmost part of the Black Sea (including the Georgian water area), which is one of the parts of the Black Sea Nowcasting/Forecasting System, is developed. A core of the coastal forecasting system is a high-resolution baroclinic regional model of the Black Sea dynamics developed at M. Nodia Institute of Geophysics of Iv. Javakhishnili Tbilisi State University (RM-IG). The RM-IG is based on a primitive system of ocean hydro-thermodynamics equations in hydrostatic approximation. The regional area, which is limited to the Caucasian and Turkish coastal lines and the western liquid boundary coinciding with a meridian 39.360E, is covered with a grid having on horizons 193 x 347 points with step equal to 1 km. This model is nested in the basin-scale model (BSM) of the Black Sea dynamics of Marine Hydrophysical Institute (MHI, Sevastopol/Ukraine) with 5 km resolution. All input data with one hour time step frequency corresponding to 3 days' forecasting time period are available in operative mode from MHI via ftp site. These data provide initial and boundary conditions for the RM-IG. With the purpose of demonstrating the functioning of the coastal forecasting system some results of marine forecasts for summer and autumn seasons are discussed. Comparison of the fields predicted from the RM-IG and the BSM of MHI shows that the usage of the model with high resolution is very important factor to real reproduction of coastal hydrophysical processes.

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