Variability in spatial patterns of long nonlinear waves from fast ferries in Tallinn Bay

Torsvik, T., Didenkulova, I., Soomere, T., and Parnell, Kevin E. (2009) Variability in spatial patterns of long nonlinear waves from fast ferries in Tallinn Bay. Nonlinear Processes in Geophysics, 16 (2). pp. 351-363.

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High-speed ferries are known to generate wakes with unusually long periods, and occasionally large amplitudes which may serve as a qualitatively new forcing factor in coastal regions that are not exposed to a sea swell. An intrinsic feature of such wakes is their large spatial variation. We analyze the variability of wake conditions for the coasts of Tallinn Bay, the Baltic Sea, a sea area with very intense fast ferry traffic. The modelled ship wave properties for several GPS-recorded ship tracks reasonably match the measured waves in terms of both wave heights and periods. It is shown that the spatial extent of the wake patterns is very sensitive to small variations in sailing conditions. This feature leads to large variations of ship wave loads at different coastal sections with several locations regularly receiving high ship wave energy. The runup of the largest ship wakes on the beach increases significantly with an increase in wave height whereas shorter (period <2–5 s) waves merge into longer waves in the shoaling and runup process.

Item ID: 5560
Item Type: Article (Research - C1)
ISSN: 1607-7946
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© Author(s) 2009. This work is distributed under the Creative Commons Attribution 3.0 License.

Date Deposited: 11 Nov 2009 04:21
FoR Codes: 04 EARTH SCIENCES > 0405 Oceanography > 040503 Physical Oceanography @ 33%
04 EARTH SCIENCES > 0406 Physical Geography and Environmental Geoscience > 040601 Geomorphology and Regolith and Landscape Evolution @ 33%
09 ENGINEERING > 0911 Maritime Engineering > 091104 Ship and Platform Hydrodynamics @ 34%
SEO Codes: 88 TRANSPORT > 8802 Water Transport > 880206 Water Safety @ 50%
96 ENVIRONMENT > 9611 Physical and Chemical Conditions of Water > 961102 Physical and Chemical Conditions of Water in Coastal and Estuarine Environments @ 50%
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