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The Danube has been a traditional trade route in Europe since ancient times. Transport on the Danube has many economic and environmental advantages. By using the river as a transport route, logistics costs can be reduced, and delivery times optimized. Another feature of the Danube is its connection to the North Sea and maritime transport via the Rhine-Main-Danube Canal. In addition, waterborne transport produces less carbon dioxide than road or rail transport, helping to reduce environmental impact and promote sus...

The roughness of a ship-s hull can have a significant impact on the environment, primarily through its effect on the ship-s fuel consumption and, consequently, carbon emissions. The resistance a ship encounters as it moves through the water can be broadly categorized into two main types: frictional resistance and wave-making resistance. Hull roughness increases frictional resistance, also known as skin friction resistance. This resistence component is a major aspect of the total resistance of a merchant ship, lead...