Browsing by Author "Bilgili, Levent"

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Estimation of Dilution Factor for Moving Cruise Ships by Artificial Neural Networks
(Springer int Publ Ag, 2022) Sahin, Volkan; Bilgili, Levent; Vardar, Nurten
Although domestic wastewater originating from ships is discharged to the sea after being treated in the treatment system, it cannot meet the wastewater concentration standards determined by the authorities in terms of some pollutant concentrations. This problem is more important on cruise ships, which can carry much more people than other commercial ships. After the wastewater treated in the treatment system on the ship is discharged to the sea, it is subjected to a secondary natural treatment due to the turbulence that occurs on the ship's trail. This phenomenon, called dilution, helps the pollutant concentrations in high concentrations to reach the wastewater standards determined by the authorities in a short time. The magnitude of this dilution is called the dilution factor. In this study, gross ton, deadweight ton, passenger number, freeboard, engine power, propeller number, and block coefficient data of a total of 1942 passenger ships, 941 of which were small and 1041 of which were large passenger ships, were used in artificial neural networks to determine which parameter was more effective in calculating the dilution factor. Engine power and gross ton value were determined as the most effective parameters for the dilution factor, and it was seen that by using these parameters alone in artificial neural networks, the dilution factor could be successfully predicted regardless of whether the ship was small or large. Finally, the effect of dilution was assessed in terms of sustainable development goals and life cycle perspective.
A Literature Analysis on Environmental Impacts and Relevant International Legislation of Shipyards
(Univ Dubrovnik, 2024) Sahin, Volkan; Bilgili, Levent
Shipyards are the place where the life cycle of a ship begins and ends. The life cycle of a ship, which starts with painting, blasting, and welding processes during the construction, is completed with the recycling of the steel parts and other equipment after the ship is scrapped. In this study, the harmful waste generated during the construction and recycling of ships in the shipyard and the environmental damage caused by this waste were investigated through a literature analysis. The content, implementation procedures and development processes of the relevant regulations are also examined. To fully evaluate the cumulative and holistic environmental impacts of shipyard processes, it is recommended to make greater use of the life cycle assessment approach. In this way, it will be possible to determine which process is more environmentally harmful during the shipbuilding, operation, and recycling phases, and to accurately determine the overall impact.