In this study, depositional areas of cohesive and non-cohesive sediments of which diameters are less than 500 mu m, carried by the Arakli Karadere River to the Eastern Black Sea are examined in the marine environment. Affects of changes in the amount of cohesive sediments entering the sea from Arakli Karadere River, sediment drift velocity, direction and magnitude of wind-stream on depositional areas of cohesive sediments are observeded separately. Pomsed program is implemented to model the directions and amount of cohesive sediments entering to Black Sea. By the help of this model, different scenarios can easily be carried out in a short time to observe the final positions of cohesive sediments in the marine environment. Arakli coastline is between two rivers, and is not affected by the winds too much. However, the location is excessively affected by the cohesive sediments. The most proper location and form of a probable port in which siltation effect is minimum are investigated in the directions of the findings. This study points out the accumulation time and rate of the cohesive sediments caused by the wind and waves for the probable port construction.