Abstract
Abstract. 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.
Highlights
OgeoscieAsBpnabelcsettidceraSsvceetas.,sHeclaisugshai-rnaegmripnelgtietunulsdaerelbyweaoactbehsreerrwvoeasdvioensinBainniToddauldglciisneetdnuorbbBsyiancyDghi,ieismgtcnhhuae--scsieonss1 Introduction rine habitants in the coastal zone
The anomalous impact of waves from high-speed vessels on coasts is considered with respect to their specific group structure
It is shown that Weibull distribution can be a good model describing the distribution of wave heights in a single wake and corresponding run-up heights
Summary
Atmosp2hNiezhrnicy Novgorod State Technical UniversityA, NtimzhnoysNpohvgeorroicd, Russia. OgeoscieAsBpnabelcsettidceraSsvceetas.,sHeclaisugshai-rnaegmripnelgtietunulsdaerelbyweaoactbehsreerrwvoeasdvioensinBainniToddauldglciisneetdnuorbbBsyiancyDghi,ieismgtcnhhuae--scsieonss Introduction rine habitants in the coastal zone. Such a strong impact on Waves induced by high-speed vessels, the depth Froude numthe coast may be a result of a certain group structure of ber (the ratio of the ship’s speed and the maximum phase of thCelitaawhmntPaevPeaawexiksptasaeevaktretaimrtwiheaibnsketeaal.olcchsIatn,utidTooyarndlloei(fnr1nt0tho0eBmuagnyrod.frueTorpmshtseatntrmhudecotisuctt,orehaesneotreferatgothweeftteshicetephCwvrDweeeialsssaikecmstePneuesrsltasaiotsnestsdanpuesewrueinbdggjeeotcnfhteelroianrfeteigoianurntleawonrafsstieavlriaelriwgnsetgauvdraeeynsgdifimnopreothtwehexeecrleafguesivtldestsneh0ni.dp6eys,pehtaoharp)vseeoraafbftteiwencrohgmtihcaheet depth 2.7 m) have amplitudes of about 1 m and periods of cruise speeds up to 30 knots has been introduced 8–10 s and cause maximum run-up heights on a beach up to Kofoed-Hansen, 2001; Parnell et al, 2007, 2008; Soomere, EartDhySnya1wsoms.fmh4dtaemeilriflecfe.mertsTrhaehemneltsapherlgeiwteiugsadhtvetaesnasadnnrdledoppnpregeerserieisoontddtwswfarcvaeaveqnseusbpe.enrSocspoyeampmgaearottaiEedmteuaaedlhasreeteattvDhhddeenyopgSfwanDrocoiyaksttuhhcespmieutnsstrsesiicomnss2pctha0aang0tl7iba;aerKeeatuearxmel.pn,aon2jsoo0ery1d1ceot)to.naItsltr.ii,hgb2anus0itfio0brc9ea,eonn2ft0den1ena1met;urogTrsayotlrrstahovtyeiksddertecohttdaiaoytlnn.t,hsa2meos0ife0c9wclo;oaaRavsdeatsssone wave wake event. The wave heights within a wake are (Soomere, 2005a). Kofoed-Hansen, 2001) and Tallinn Bay, Estonia (Parnell et al, 2008)
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
