168
asymmetricallyconcavearctothesoutheastcoastline
thereisafamousport‐fortressʺTemryukʺ‐themain
sourceofcontaminants(pollutants)onthisstretchof
coastline(themouthoftheKubanriver).
2 OBJECTSANDMETHODS
2.1 Naturalconditions
Theobjectofstudyistheeasternpartofthesouthern
shores
oftheSeaofAzovintheTemryukgulf:from
thevillageofIlyichinthewesttotheportofTemryuk
atthemouthoftheKubanRiverandtotheborderof
theTemryukDistrictintheeast.Fromthebasalpart
ofthespitofChushkain
thethroatoftheKerchStrait
to the section between the villages of Perekopskaya
andKuchugury, thelengthofthecoastlineis~70km.
Abrasion‐landslide and crumbling coast of the
western sector of the Temryucsky Gulf are
complicatedbyravines,gulliesandstackedlikeeasily
eroded loam and denser
rocks on the headlands,
whereafterthestormareasofrockandclaythebench
are exposed. On the shores, abrasion prevails over
locallymanifestedsedimentaccumulation.Shorewith
ledges 60 m in height are being destroyed at an
averagespeedof0.5‐0.6m/year–itis
notedfromthe
secondhalfofthe20thcentury(Boldyrev&Nevessky
1961,Kasyan&Krylenko2007).Shelly‐sand(30‐50%,
and90%detritus)beaches,narrow(5‐10m)inareasof
abrasion, expand to 20‐25 m on the banks of the
dynamically stable sprinkling estuaries. Local
abrasion in the
areas of village Golubitskaya and
Kurchanskylimanisassociatedwithstormsurges(up
to4.2m).Locationofzonesofconcentrationoftheir
energy is controlled by the peculiarities of the
transformation on the beach waves. Modern
accumulationisseeninthefollowing:a)shellysand‐
semi‐fixeddunes(up
to5m)onthescarpnearvillage
Kuchugury(frontalsectionofthemaximumexposure
Enstream);b)theextensionoftheseaestuarinebars
andharddismemberedchannelsdeltaofriverKuban
(Petrushinskoe sleeve mouth: silts, sands, shelly
ground, pebbles); c) The bottom accumulation on
Chaykinskoe shoal(provoked by the
constructionof
breakwaters Glukhoy channel port) and capes
Ahilleon, Kamenny, Pekly (with circulating vortex
shedding). Sandy alluvium of Kuban has been
involvedinbeachcreationsince1909,whentheflow
of theriver began tobecarried directly into the sea
through Petrushinskoe sleeve. By 1954, the border
coastalsands
withdarkbluebottomsilthaspopped
upfromthedepthsof4‐5m(1927)seaward–upto8
m.Mostofshellygroundisejectedfromthebottomof
stormerosionofsiltandshellycans(waterdepthof8‐
12 meters ) (Boldyrev & Nevessky1961, Kasyan
&
Krylenko2007).
Among the especially dangerous weather
phenomena affecting the safety of navigation, the
operationoftheportandtheriskofspillageoverthe
water area, it is possible to identify such
characteristics as frost, ice conditions, wind, waves,
currents(About...,2015).
The most severe frosts during
the last 80 years‐
28.70C occurred in February (1954). The average
annualrainfallis519mm.Therearedroughtslasting
up to 2 months and showers‐up to 150 mm of
precipitation in 1‐2 hours. The average annual
humidity is79%. During theautumn fogsit reaches
100%.
Strong winds
cause surges and water drifts near
the shore, the extreme characteristics of which have
been studied little. Driving‐surging phenomena can
takeacatastrophiccharacter,causingfloodingoflow‐
lying areas with up to 3.5‐4.2 m above the current
level. The level regime is determined by the water
exchange
withtheBlackSea(theincomingpartofthe
balance is 38%, the expenditure part is 50%). Seiche
fluctuationsintheleveloftheseaaresmallbecauseof
thesmallsizeofthewaterarea.
Theaveragenumberofstormsatwindspeed>15
m/s(8‐10points)
‐20casesperyear.Amongthem,
on 9‐point storms there are, on average, 5 casesper
year. Storms force 10 points‐1 time in 5 years.
Averagedurationofthestorm:12hours(inAugust)
and28hours(inDecemberandMarch).
Wind is the cause of most different
kinds of sea
currents. On average, a wind speed of 5.3 m / s
generatesacurrentof13.1cm/s.Flowratesof20‐30
cm/s (capableofmovingsanddeposits)accountfor
7% of recurrence per year. Very rarely, in the
conditions of spring and autumn
‐winter storms,
speedsof>40cm/scandevelop.Dischargecurrents
attheoutletfromthegirthofestuariesandinthearea
ofthemouthoftheKubanareupto1.5‐2m/s.The
directions of the current in the wave zone are
controlled in
the gulf by the configuration of the
shoreline and tend to take the direction along the
isobaths. At S and NE winds, the current in the
surfacelayerdeviatestothe rightfrom thedirection
ofthewind,andatWandNWthewind‐totheleft.
In both cases
‐towards the sea. For the wave zone,
discontinuous compensating currents in the bottom
layer are characteristic. In strong winds, the current
cancovertheentirethicknessofthewater,whichin
27%ofcasesoccursinweakandmoderatewinds.
Wind wave type prevails during the year. Its
parameters are
limited by small dispersals and
shallow water. Waves are very steep. They reach
heightsof3‐3.5m,aperiodof≤4‐5sandalengthof
≤50 m. Wind waves rapidly increase, but after 4 ‐6
hoursthegrowthofthewaveparametersceases.The
waveheightof
3misreachedatawaveof0.1%ofthe
supply.Theaveragemaximumwavesof0.8‐1.1min
height prevailing in the autumn‐winter period are
destroyed at depths of 1‐1.04 m, determining the
averagedimensionsofthewavefrontzone.Stormsof
NE, E, SW and W
directions have a repeatability of
80%. The strongest disturbances in the Temryuk
districtareobservedintheWandNWwindswiththe
maximumwaveheightsof1.8and1.6m,respectively.
Thewavebreakingzoneextendstodepthsof~2.3m,
andatamaximumwaveheightof
3m‐to3.4mof
theseadepth.IntheNEwind,theaveragemaximum
waveheightis1.2m.Violationsof≥4pointsoccurin
February‐fromSW,WandNW.
The ice period continues, on average, about 70
days: from January 2 (the appearance of the initial
forms
ofice)to10‐12March(completecleansingfrom
ice).Ice‐freeperiod‐295days.