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| Titel |
A typical wave wake from high-speed vessels: its group structure and run-up |
| VerfasserIn |
I. Didenkulova, A. Rodin |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1023-5809
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| Digitales Dokument |
URL |
| Erschienen |
In: Nonlinear Processes in Geophysics ; 20, no. 1 ; Nr. 20, no. 1 (2013-02-26), S.179-188 |
| Datensatznummer |
250018956
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| Publikation (Nr.) |
 copernicus.org/npg-20-179-2013.pdf |
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| Zusammenfassung |
| High-amplitude water waves induced by high-speed vessels are regularly
observed in Tallinn Bay, the Baltic Sea, causing intense beach erosion and
disturbing marine habitants in the coastal zone. Such a strong impact on
the coast may be a result of a certain group structure of the wave wake. In
order to understand it, here we present an experimental study of the group
structure of these wakes at Pikakari beach, Tallinn Bay. The most energetic
vessel waves at this location (100 m from the coast at the water depth
2.7 m) have amplitudes of about 1 m and periods of 8–10 s and cause
maximum run-up heights on a beach up to 1.4 m. These waves represent
frequency modulated packets where the largest and longest waves propagate
ahead of other smaller amplitude and period waves. Sometimes the groups of
different heights and periods can be separated even within one wave wake
event. The wave heights within a wake are well described by the Weibull
distribution, which has different parameters for wakes from different
vessels. Wave run-up heights can also be described by Weibull distribution
and its parameters can be connected to the parameters of the distribution of
wave heights 100 m from the coast. Finally, the run-up of individual waves
within a packet is studied. It is shown that the specific structure of
frequency modulated wave packets, induced by high-speed vessels, leads to a
sequence of high wave run-ups at the coast, even when the original wave
heights are rather moderate. This feature can be a key to understanding
the significant impact on coasts caused by fast vessels. |
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