551.465On the basis on the experimental hydrological data accumulated in the database of the Marine Hydrophysical Institute of the Ukrainian National Academy of Sciences and the meteorological data of the Marine Department of the Ukrainian Scientific-Research Hydrometeorological Institute, we study the characteristics of seasonal variability of the processes of renewal, freshening, and salinization of waters in the Karkinit Bay. We analyze and estimate the repeatability of the inflows of salt and freshened waters from the sea as well as the variations of the areas occupied by these waters in the water area of the bay depending on the seasonal and wind conditions. For the spring-summer period, we estimate the period of renewal of waters in the upper layer of the main part of the bay (11-14 days). A time interval of possible absence of noticeable water exchange between the main and east shallow parts of the bay (of about two months) is revealed in the summer-autumn period.