Abstract
Waves from fast ferries have become an environmental problem of
growing concern to the public. Fast ferries produce not only
higher waves than conventional ships but also fundamentally
different wave systems when they sail at supercritical speeds.
Hitherto, ship waves have been considered as being generated by
the ship hulls alone. Whereas this assumption may be reasonable
for conventional ships with large hulls and limited propulsive
power, the situation is different for fast ferries with their
smaller hulls and very large installed power. A simple theoretical
model and a series of model tests on a monohull fast ferry seem to
indicate that a substantial part of the wave-making can be
directly attributed to the propulsion system itself. Thus, two
wave systems are created with different phases, but with similar
frequency contents, which means that they merge into one system
behind the ship, very similar to that of the hull alone, but with
higher wave amplitudes. Conventional propellers will cause
increased wave heights of about 10%, whereas water jets will cause
increased wave heights of 20-40% as compared to those of the naked
monohull.
Original language | English |
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Title of host publication | 14th Fast Ferry International Conference. Conference Papers |
Place of Publication | Sayers Lane, Tenterden |
Publisher | Fast Ferry International Ltd. |
Publication date | 1998 |
Publication status | Published - 1998 |
Event | 14th Fast Ferry International Conference - Copenhagen, Denmark Duration: 24 Feb 1998 → 26 Feb 1998 Conference number: 14 |
Conference
Conference | 14th Fast Ferry International Conference |
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Number | 14 |
Country/Territory | Denmark |
City | Copenhagen |
Period | 24/02/1998 → 26/02/1998 |