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1 INTRODUCTION
Theobjectiveofthepresentpaperistodeterminethe
windimpacttoavesselinteractingwithseaice.Here
weconsidertwoshipicestickingeventsonwhicha
sufficientdescriptionisavailable.
TheGulf of Finlandhas a special combination of
intense winter shipping and extensive seasonal ice
cover.TheGul
fofFinlandisicecoveredinnormal
andseverewinters[1].Strongwindsblowofftenon
theGulfofFinland.Thewindgeneratesicepressure
andalsoitimpactsdirectlyonavessel.Avesselhull
appears to the wind as a sailing.Maximum day
averagewindspeedstayedbelow15m/sinthewinter
seasons19712005 [2]. In severe winters strong
winds blow from N and NE. In mild winters SW
windsdominateintheGul
fofFinland[3].
The icesticking of ships causes a tremendous
economic loss. The ship loses its speedor even
sticksinice.Inthemodera
tewinter2009/10about250
entrapment events are reported. According to the
data, the ships spent in icecatch totally 67 days [4].
Theneedfordetours toavoidhardiceareasraisesthe
trip duration. Vessel hull may get damage when
sailinginice.49shiphulldamagestookpla
ceinthe
GulfofFinlandintheseverewinter2002/03[5].
The ice pressure is rarely measured on the GoF.
TukkerandPerovich[6]goticestressupto350kPain
packiceintheArcticarea.Thischaracteristicdepends
on the lot of fact
ors: the ice thickness and
concentration,icetypeanditsshape,windspeedand
direction.Theicepressurevariesgreatlyalongarea
andtime.
2 CASEDESCRIPTIONS
We observe the two icesticking events on which a
sufficientdescription(thelocation,timeandtheevent
recordinthelogjournal)isav
ailable.
2.1 Case1:Nordlandia,29thJanuary2010
TheferryNordlandia,153mlong,ca40mhighwith9
decks.UsuallyitgetsfromHelsinkitoTallinn(Fig.1
and2)in3.5hours.ButontheJanuary29th2010the
voyage took 10 hours as the vessel got stuck in the
A Case Study of the Wind Impact on Ship Ice-sticking
J
.Rjazin&O.Pärn
TallinnUniversityofTechnology,Tallinn,Estonia
ABSTRACT:Inthepaper,theimpactofwindonaferrysailinginicefieldisdescribedandanalysed.Twoice
stickingeventsontheGulfofFinlandaretakenforthecasestudy.Thewind,especiallyitsdirection,isstatedas
animportantfactortoentrapavesselintheice.Thewindblowing acrossthevessellongit
udeaxiscausedboth
theshipstostick.
http://www.transnav.eu
the International Journal
on Marine Navigation
and Safety of Sea Transportation
Volume 10
Number 4
December 2016
DOI:10.12716/1001.10.04.06