Conditions favorable for protection the marine
shore of the Vistula Spit and Sambian Peninsula(the Baltic Sea, Kaliningrad Oblast) by offshore
disposal of dredged material
Andrei Sokolov, Boris Chubarenko
Laboratory for Coastal Systems Study
Atlantic Branch
P.P.Shirshov Institute of Oceanology ofRussian Academy of Sciences
Immanuel Kant Baltic Federal University(IKBFU)

AnSokolov@kantiana.ru

2Introduction
The entrances tomarinas and ports inthe South-Eastern
Baltic are regularly
filling by sand and,
therefore, require
periodic dredging.
No 2 and No 3 are theregular dumping sites.
No 1 is theexperimental dumpingsite.

A picture by Chechko, V. A. and Topchaya, V. Yu

Sokolov, Chubarenko. “Conditions favorable for protection the marine shore of the Vistula Spit and SambianPeninsula (the Baltic Sea, Kaliningrad Oblast) by offshore disposal of dredged material”.

3

The extremely eroded point• Number 1 is a location near the most eroded point in a Kaliningrad region.
• Previous investigations: the experimental dumping site (No 1) is ineffectivefrom the beach erosion protection point of view.

Sokolov, Chubarenko. “Conditions favorable for protection the marine shore of the Vistula Spit and SambianPeninsula (the Baltic Sea, Kaliningrad Oblast) by offshore disposal of dredged material”.

4Aim and method• Aim of the study: find out if the regular dumping sites
could be effective from the shore erosion protection pointof view.
• Method: examine the behavior of the material during andafter the dumping event by numerical simulation under
the different wind scenarios.
• Tool: MIKE by DHI, Hydrodynamic, Spectral waves andMud transport modules.
• General setup: 3D formulation (10 layers in depth,
sigma-coordinates); finite volume method on an irregulargrid.

Sokolov, Chubarenko. “Conditions favorable for protection the marine shore of the Vistula Spit and Sambian
Peninsula (the Baltic Sea, Kaliningrad Oblast) by offshore disposal of dredged material”.

Computational domain and locations of dumping sites• All boundaries
are closed• Wind is theonly driven
force in thesystem• The windspeed anddirection are
the same in allarea• Water depth at
all dumping
sites is about
8-9 m
Sokolov, Chubarenko. “Conditions favorable for protection the marine shore of the Vistula Spit and Sambian
Peninsula (the Baltic Sea, Kaliningrad Oblast) by offshore disposal of dredged material”.

6 Calibration. Field measurement results
BeforedumpingAfterdumping

A picture from Chechko, V.A., Chubarenko, B.V., Boldyrev, V.L.,
Bobykina, V.P., Kurchenko, V.Yu., Domnin D.A., 2008. Dynamics of themarine coastal zone of the sea near the entrance moles of theKaliningrad Seaway Channel. Water Resources 35 (6). 652–661.

• The disposed
sediments layer
thickness in thecenter of the newdumping site wasabout 15 cm• Fractions:
1 – medium sand;2 – fine sand;3 – very fine sandwith the median
diameter of about
0.07 mm

Sokolov, Chubarenko. “Conditions favorable for protection the marine shore of the Vistula Spit and Sambian
Peninsula (the Baltic Sea, Kaliningrad Oblast) by offshore disposal of dredged material”.

7 Calibration of sedimentation and resuspension
Approximate time of discharges:
1) 17.06 12:00
2) 19.06 12:00
3) 20.06 12:00
WindWind speed, m/s

20
18
16
14
12

10
8
6
4

20
17.6

18.6

19.6

20.6

21.6

22.6TimeSokolov, Chubarenko. “Conditions favorable for protection the marine shore of the Vistula Spit and Sambian
Peninsula (the Baltic Sea, Kaliningrad Oblast) by offshore disposal of dredged material”.

23.6

8

Verification of thewind uniformity
Significant wave height3

Hs_bouy2.5

Hs_calc

2

1.5

1

0.5

0
1/7

4/7

7/7

10/7

13/7

16/7

19/7

22/7

25/7

Time
Sokolov, Chubarenko. “Conditions favorable for protection the marine shore of the Vistula Spit and Sambian
Peninsula (the Baltic Sea, Kaliningrad Oblast) by offshore disposal of dredged material”.

28/7

31/7

Scenario of the dumping event
Discharge
1210Wind Speed

9864
20
0:00

12:00

0:00

12:00

0:00

12:00

0:00
Time

• Wind speed: 5m/s, 7m/s, 10 m/s, 15 m/s• Wind direction (from): E, NE, N, NW, W, SW
Sokolov, Chubarenko. “Conditions favorable for protection the marine shore of the Vistula Spit and Sambian
Peninsula (the Baltic Sea, Kaliningrad Oblast) by offshore disposal of dredged material”.

10NE wind, 10 m/s

Winddirection

Sokolov, Chubarenko. “Conditions favorable for protection the marine shore of the Vistula Spit and Sambian
Peninsula (the Baltic Sea, Kaliningrad Oblast) by offshore disposal of dredged material”.

11NE wind, 7 and 10 m/s
Wind
directionWind
direction

7 m/s

10 m/sSokolov, Chubarenko. “Conditions favorable for protection the marine shore of the Vistula Spit and Sambian
Peninsula (the Baltic Sea, Kaliningrad Oblast) by offshore disposal of dredged material”.

12NE, N, SW and W wind, 10 m/s
Wind
directionWind
direction

WinddirectionWind
direction

Sokolov, Chubarenko. “Conditions favorable for protection the marine shore of the Vistula Spit and Sambian
Peninsula (the Baltic Sea, Kaliningrad Oblast) by offshore disposal of dredged material”.

The fate of the sediments

13Wind range
SW, 2-5 m/s
SW, 6-9 m/s
SW, 10-13 m/s
SW, 14-17 m/s
W, 2-5 m/s
W, 6-9 m/s
W, 10-13 m/s
W, 14-17 m/s
NW, 2-5 m/s
NW, 6-9 m/s
NW, 10-13 m/s
NW, 14-17 m/s
N, 2-5 m/s
N, 6-9 m/s
N, 10-13 m/s
N, 14-17 m/s
NE, 2-5 m/s
NE, 6-9 m/s
NE, 10-13 m/s
NE, 14-17 m/sE, 2-5 m/s
E, 6-9 m/s
E, 10-13 m/s
E, 14-17 m/s

Wind Probability, %Modelled wind speed

Dumping site No 1Dumping site No 2Dumping site No 3

5.16
7.19
1.38
0.24
4.01
6.38
2.76
0.74
6.04
5.55
1.06
0.3
5.97
2.54
0.22
0.06
5.44
1.01
0.03
9.46
1.62
0.3
-SW, 5 m/s
SW, 7 m/s
SW, 10 m/s
SW, 15 m/s
W, 5 m/s
W, 7 m/s
W, 10 m/s
W, 15 m/s
NW, 5 m/s
NW, 7 m/s
NW, 10 m/s
NW, 15 m/s
N, 5 m/s
N, 7 m/s
N, 10 m/s
N, 15 m/s
NE, 5 m/s
NE, 7 m/s
NE, 10 m/s
NE, 15 m/s
E, 5 m/s
E, 7 m/s
E, 10 m/s
E, 15 m/s

No
Far
Far∞0No
Far∞NoFar∞∞NoFar
Far∞0No
Yes∞0
Yes
Far∞0NoNo
Far0NoFar∞0Yes
Far∞00No
Far00
Yes
Far000
Yes

No
Far∞∞
Yes
Yes
Far∞0
Yes
Yes
Far

Yes
Yes
Yes
Far0
Yes
Far∞
Yes
Yes
∞∞

“Yes” – sediments are settled near the shore not far away from the dumping site;“No” – there is no deposition near the shore, sediments are transported seaward but not very far from the dumping site;“0” – sediments are not washed from the dumping site due to low currents;“Far” – sediments are transported near the shore very far from the dumping site and are dispersed along the big distance;“∞” – sediments are washed out from the dumping site completely and spread over the huge area, the layer thickness is negligible.
Sokolov, Chubarenko. “Conditions favorable for protection the marine shore of the Vistula Spit and Sambian
Peninsula (the Baltic Sea, Kaliningrad Oblast) by offshore disposal of dredged material”.

14••

•

•

•

Conclusions
Winds with the speed less then 5 m/s do not lead to resuspension of thesediments if the dumping sites located at the depths of about 8-9 m.
Winds with the speed more than 15 m/s lead to the complete washing outof disposed material from the dumping site and spreading it over thehuge area with a negligible layer thickness.
From the point of potential protection of the shore near a dumping site
the best option would be the winds of about 7-10 m/s, which wash out
disposed material and transported it along the shore at a distance of few
kilometers.
For the dumping sites located at the western shore of the SambianPeninsula (1 and 2) the winds with alongshore (southward) and seaward
components may transport sediments towards the shore; but theprobability of such winds are rather low – not more than 8.4%.
5) For the dumping site at the northern shore of the Sambian Peninsula(No 3), the probability of favorable wind is much bigger (in total 28.6%):
SW, W, N, NE and E winds.
Sokolov, Chubarenko. “Conditions favorable for protection the marine shore of the Vistula Spit and Sambian
Peninsula (the Baltic Sea, Kaliningrad Oblast) by offshore disposal of dredged material”.

15Acknowledgements• Authors thank colleagues from IBW PAN for providing thedata for calibration of the model.
• The study of the dumping sites 1 and 2, located at theVistula Spit was supported by the Russian National
Foundation Project N 14-17-00547 “A forecast development
for evolution of accumulative Russian coasts of tidelessseas”• The study of the dumping site 3 – by the Russian National
Foundation Project N 14-37-00047 “Geoecologicalconditions of maritime use in the Russian sector of theSouth-Eastern Baltic”.

Sokolov, Chubarenko. “Conditions favorable for protection the marine shore of the Vistula Spit and Sambian
Peninsula (the Baltic Sea, Kaliningrad Oblast) by offshore disposal of dredged material”.

Thank you for your attention
and for your patience

Sokolov, Chubarenko. “Conditions favorable for protection the marine shore of the Vistula Spit and Sambian
Peninsula (the Baltic Sea, Kaliningrad Oblast) by offshore disposal of dredged material”.