Far-field vessel wakes in Tallinn Bay

Parnell, Kevin, Delpeche, Nicole, Didenkulova, Ira, Dolphin, Tony, Erm, Ants, Kask, Andres, Kelpšaite, Loreta, Kurrenoy, Dmitry, Quak, Ewald, Räämet, Andrus, Soomere, Tarmo, Terentjeva, Anna, Torsvik, Tomas and Zaitseva-Pärnaste, Inga (2008) Far-field vessel wakes in Tallinn Bay. Proceedings of the Estonian Academy of Sciences: Engineering, 14 (4). pp. 273-302.

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Abstract

The properties of wave fields induced by high-speed ferries and recently introduced conventional ferries with increased cruise speeds are analysed for a site in Tallinn Bay, the Gulf of Finland, the Baltic Sea, located about 3 km from the sailing line and up to 8 km from the wave production area. The analysis is based on high-resolution profiling of the water surface for about 650 wakes from fast ferries, measured during 4 weeks in June-July 2008. The new large conventional ferries with cruise speeds of 25-30 knots (~45-55 km/h) sail at near-critical speeds along extensive sections of eastern Tallinn Bay, and excite wakes equivalent to those of high-speed ferries. The peak periods of these wakes are between 10 and 13 s. The typical daily highest ship wave is approximately 1.2 m, measured prior to wake breaking. The largest recorded ship wave in calm conditions had a height of 1.5 m and in the presence of some wind wave background 1.7 m. The cumulative impact of ship wakes results in a gradual increase in the suspended matter concentration in near-bottom water over the course of a day. The largest and longest ship waves produce considerable wave runup at the coast and prevent several coastal sections from achieving an equilibrium state. The largest ship waves have an asymmetric shape both in terms of the water surface elevation above and below the mean level and in terms of the shape of the wave front and back. The overall intensity of anthropogenic waves has remained at the same level as it was in the year 2002, although the ships that produced the highest waves in the past are no longer in service.

Item Type:	Article
Faculty \ School:	Faculty of Science > School of Environmental Sciences
UEA Research Groups:	Faculty of Science > Research Groups > Collaborative Centre for Sustainable Use of the Seas
Related URLs:	http://dx.doi.org/10.3176/eng.2008.4.01
Depositing User:	Rosie Cullington
Date Deposited:	25 Feb 2011 15:04
Last Modified:	24 Oct 2022 01:02
URI:	https://ueaeprints.uea.ac.uk/id/eprint/24679
DOI:	10.3176/eng.2008.4.01

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