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The environmental approach of a port project and more specifically the hydrodynamic circulation and the renewal time of the waters in the Fisheries Shelter of Nea Krini in Kalamaria (Thessaloniki Bay) constitute the main aim of this postgraduate thesis. The study and the relevant calculations were carried out using a mathematical model. More and more in recent years, mathematical models have been used to understand better coastal processes and predict the environmental impacts of port projects (ports, marinas, fishing shelters, etc.) in order to find solutions for the avoidance or at least the reduction of negative environmental effects. Such effects may refer to sediment transport which causes a dynamic change in the coastline, coastal erosion, or stagnant waters which can be caused from the construction of coastal technical works. At the beginning of this thesis, port and coastal projects and their influence to the coastal environment are described. Then, the specific project of the fishing Shelter of Nea Krini in Kalamaria is presented. More specifically, the site of the construction and the relevant projects that were previously done were presented in short. Next, the description of a two-dimensional, mean in depth, hydrodynamic model follows, in order to simulate the wind generated hydrodynamic circulation in the coastal environment and the renewal of waters in the basin of a marina - a fishing shelter. FORTRAN was the programming language used to build the model. The model results were illustrated by the program GOLDEN SOFTWARE SURFER so that the relevant hydrodynamic phenomena through visualization could be better understood. The model application provides the examination of alternative cases of technical configurations of the structure (assessment of different cases of openings for better renewal of the port basin) so that an optimal environmental design for the harbor can result. Furthermore, the tidal effects on the renewal of the waters were also studied. Finally, the concentration of BOD in the fishing harbor for the average time of waters renewal of each case was examined. This calculates the self-cleaning capacity of the shelter, and in this way it is checked if the project design is effective. In the end, the results are analyzed and lead to conclusions in relation to three different alternative cases concerning the possible existence of openings in the structure of the harbor. It is obvious that the use of mathematical models can lead to the diagnosis and prognosis of some environmental problems and help the scientists and engineers to modify an initial form of a study giving the best possible technical and environmental solutions