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The coastal area of Katerini, and especially the area of the Municipality of Paralia, faces coastal erosion for 30 years. In a four-year period from 1984 to 1989, since the construction of the fishing shelter, there was a severe erosion of the coastline north of the port, about 600 meters. It was also observed south of the fishing shelter Coastal Coast. The intense alterations in the morphology of the shoreline were a matter of concern to the responsible and led, in 1988, to the elaboration of the "Preliminary study of the protection of disturbed coasts of Pieria." By YPEKA. This study foresaw the construction of cantilevers was later implemented. After the construction of the headlights, a further change of the beach followed due to this intervention and the additional reconstruction. Negative impacts were also the construction of dams in upstream rivers, which significantly reduced the supply of seawater to the sea. The system of 12 arms that existed in the area for more than 10 years was removed and replaced by a set of three single, submerged waveguides. In this thesis, according to the official data, studies and calculations that followed, the problem of coastal erosion of Paralia Katerini is investigated.