Our Footprint in the Maritime Ecosystem
Everybody knows, from personal experience, that humans make noise – particularly when they use machines. Machines such as ships. On a ship noise acts in two directions: on the one hand, pressure waves in water travel over large distances and threaten lifeforms that have lived here undisturbed since prehistoric times. On the other hand, noise and vibration place considerable stress not only on the crew (and passengers), but also on the ships structure. Besides the engines, the propeller is next biggest source of vibrational noise. It imparts shock waves directly on the surrounding water and these, upon collision with the hull; transfer the shock to the ship.