Experience of wind waves calculation for extremely dangerous storms in the Black Sea  <B>Experience of wind waves calculation for extremely dangerous storms in the Black Sea</B><P>V.G. Polnikov an E.N. Sychov</B><I><P> Marine Hydrophysical Institute of the National Academy of Sciences of Ukraine, Sevastopol, Ukraine</I><P> Abstract<P> Calculation of a wind waves state during a storm is very important from many practical points of view. The using of numerical model of wind waves permits to find the following features of storm waves: a) the time of developing of the most dangerous waves; b) the size of dangerous domains and their location and moving; c) the duration of existence of dangerous waves in the course of a storm; d) the features of swell spreading and dissipation. These and some other features of the real storm situations have been analyzed on the basis of the using of a third generation spectral model for real storms in the Black Sea on 09.11.80 (S1) and on 28.10.87 (S2). The wind field have been taken from Meteorological office of Sevastopol. The first storm (S1) had a form of a strong cyclone with the eye located near the point (29 degrees W, 45 degrees N) and maximum wind speed about 25 m/s. The radius of the zone with a maximum winds was about 300 km. The second storm (S2) had a feature of a very large cyclone with a quasy uniform wind field in the western part of Black Sea with velocity about 20 m/s. The duration of the second storm was 16 hours. For both cases all feature of storm waves mentioned above were found. The main of them are: a) the time of developing of the most highest waves is 58 hours; b) the dangerous domain is located in 200 km further of a maximum wind in its direction; c) the dangerous waves with heights more than 2 meters exist for the 56 hours after the storm decay; d) the swell is spreading with the group velocity of the peak component and dissipating linearly with time. All other details are analyzed.<P>