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GEOLOGICAL SURVEY OF THE GEOLOGICAL SURVEY OF THE EXTREMELY SHALLOW AREA EXTREMELY SHALLOW AREA

OF THE ISLAND OF PAGOF THE ISLAND OF PAG

BRANKO PETRIČEVIĆBRANKO PETRIČEVIĆand and

ZVONKO GRŽETIĆZVONKO GRŽETIĆHydrographic Institute of the Republic of Croatia, 21000 Split Hydrographic Institute of the Republic of Croatia, 21000 Split

Zrinsko Frankopanska 161Zrinsko Frankopanska 161

SUMMARY SUMMARY -- ExExploring the area of the island of Pagploring the area of the island of Pag

•• Geological survey of threeGeological survey of three •• During two days of surveyDuring two days of survey•• Geological survey of three Geological survey of three district areasdistrict areas;;

•• Total surface of 321 442.66 mTotal surface of 321 442.66 m²²;;•• Sea areas interconnected by low Sea areas interconnected by low

small bridgessmall bridges;;•• Shallow area with an average Shallow area with an average

depth of 1 metredepth of 1 metre;;•• Use of machinery for drilling Use of machinery for drilling

•• During two days of survey During two days of survey operations, 37 geological operations, 37 geological profiles were made;profiles were made;

•• The presentation are discussing The presentation are discussing the problems encountered the problems encountered during the survey, as well as the during the survey, as well as the result of penetration into the result of penetration into the seabed that, despite small depth, seabed that, despite small depth, a great number of multiplesa great number of multiplesy gy g

was out of questionwas out of question;;•• Using of small boatUsing of small boat;;•• Equipped boat was manually Equipped boat was manually

transferredtransferred;;

a great number of multiples, a great number of multiples, and the presence of the sponge and the presence of the sponge seaweed on the bottom did seaweed on the bottom did attain the maximum attain the maximum penetration of 13 to 17 metrespenetration of 13 to 17 metres

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•• Like multiple Like multiple croissants;croissants;

•• Paška vrata Paška vrata –– gate;gate;•• Strong wind Strong wind –– area;area;•• Access to the port Access to the port

of Pag is to some of Pag is to some extent difficultextent difficult

PROJECT:PROJECT:

-- Constructing an Constructing an artificial artificial waterwaywaterway that would connect that would connect the bay of Pag to the bay of the bay of Pag to the bay of Košljun; Košljun; -- Waterway Town Waterway Town of “Pag of “Pag –– Košljun”Košljun”

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Picture of the town PagPicture of the town Pag

PAG SALT WORKSPAG SALT WORKS

1.ZONA

2.ZONA3.ZONA

1.1. ����� ������;����� ������;

2.2. �������� ����� �������� ����� ���� �� ���� �����;���� �����;

3.3. B������ ���� ����� B������ ���� ����� ��� ��� ���� �� ��� ��� ���� �� ����;��;

VERSION 1Between stone bridge and salt storage (old);

VERSION 2On the existing beach side;

VERSION 3In existing channel route (bridge);

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Geologicaly:

-Hills around Pag are older than fluvial valley (geological age)

- Before … lend!

- After … lakes!

- Finally … artificial waterway!

Area of survey Area of survey –– aerofotogrametri picture & gridaerofotogrametri picture & grid

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Area of survey Area of survey –– bathimetry & isolinesbathimetry & isolines

Area of survey Area of survey –– geology linegeology line andand sampling points by drop & piston corer sampling points by drop & piston corer

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The major problem was that the research boat could not sail from one aquatic areaThe major problem was that the research boat could not sail from one aquatic areato another andto another and ththusus had to be transported along had to be transported along

with all of the equipment, because itwith all of the equipment, because it couldcouldnot pass under the bridges not pass under the bridges

as they were too lowas they were too low !

An aerial photograph An aerial photograph made during the made during the

aerophotogrametric aerophotogrametric measurement of the measurement of the

island of Pag was used island of Pag was used b B fb B fas a base. Because of as a base. Because of

the shallowness of the the shallowness of the aquatic area, aquatic area,

underwater plantsunderwater plants are are clearly visible. These, clearly visible. These, as was determined by as was determined by

the final analysis, the final analysis, attenuate the VF attenuate the VF atte uate t e Vatte uate t e V

signal.signal. The plants on The plants on the sea bottom, which the sea bottom, which

are dark blue in are dark blue in colour on the colour on the

photograph, have a photograph, have a texture of a sponge.texture of a sponge.

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View of the View of the geological profilegeological profile(line (line Basin3_1.txt) )

and theand theposition of position of

sampling withsampling withPiston Corer (P2Piston Corer (P2))Piston Corer (P2Piston Corer (P2))

Two thirds of the recording of the geological profile Two thirds of the recording of the geological profile Basin3_1.txt

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PISTON CORERPISTON CORER

0 to 0.32 m0 to 0.32 m

0.32 to 3.0 m0.32 to 3.0 m

3.0 to 6.0 m3.0 to 6.0 m

Mud, dark gray to black colour with shell fragments, soft consistentMud, dark gray to black colour with shell fragments, soft consistent

Silt clayey, gray to dark gray, portly sandy silt with shell fragmentsSilt clayey, gray to dark gray, portly sandy silt with shell fragmentsSoft to medium consistent.Soft to medium consistent.

Silt clay, gray to dark gray, with shell fragments. Middle to portly Silt clay, gray to dark gray, with shell fragments. Middle to portly shift consistshift consisteentnt

Preview of the sample done by PISTON CORER withPreview of the sample done by PISTON CORER with penetration of 6 m (Ppenetration of 6 m (P--2) on the recording of the geological profile 2) on the recording of the geological profile Basin3_1..

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CONCLUSION:CONCLUSION:

The equipment provided by the company INNOMAR from Rostock, The equipment provided by the company INNOMAR from Rostock, called SEScalled SES--2000 COMPACT, provided, at the lowest possible cost, 2000 COMPACT, provided, at the lowest possible cost, fairly usable geological data for a preliminary study of the prospective fairly usable geological data for a preliminary study of the prospective waterway “Town of Pag waterway “Town of Pag –– Košljun”. Košljun”.

The The LOW WEIGHTLOW WEIGHT and and WATTAGE WATTAGE of the equipment, as well as the of the equipment, as well as the OPERATING CAPABILITY IN THE SHALLOW WATERS, OPERATING CAPABILITY IN THE SHALLOW WATERS, provided usable data when operating in coastal areas and enclosed provided usable data when operating in coastal areas and enclosed shallow lakes. With regard to the SMALL ANGLE OF THE BEAM, it shallow lakes. With regard to the SMALL ANGLE OF THE BEAM, it g ,g ,allows for most precise geological surveys and guarantees a wide area allows for most precise geological surveys and guarantees a wide area of use.of use.

All the operating possibilities have not yet been examined, but once the All the operating possibilities have not yet been examined, but once the equipment is in our possession, we shall use it in as many geological and equipment is in our possession, we shall use it in as many geological and archaeological surveys as possible, in the littoral and coastal areas and archaeological surveys as possible, in the littoral and coastal areas and between the islands of the eastern Adriatic region. between the islands of the eastern Adriatic region.

Elaboration:Elaboration:BLATO

Basin2_3.txt

Basin2_8.txt

Basin3_3.txt

G7

G8

G10

MALIN

D106

Basin1_1.txt

Basin1_2.txt

Basin1_3.txt

Basin1_4.txtBasin1_5.txt

Basin1_6.txt

Basin1_7.txt

Basin1_8.txt

Basin1_9.txt

Basin1_10.txt

Basin1_11.txt

Basin1_12.txt

Basin1_13.txt

SV. JELENA

LOKUNJA

D106

Basin2_6.txt

Basin3_1.txt

Basin3_4.txt

G6

P1

P2

DONJA KIRŠINA

BLATO

D106

SV. JELENA

LOKUNJA

RADAC

Basin2_1.txt

Basin2_2.txt

Basin2_3.txt

Basin2_4.txt

Basin2_5.txt

Basin2_6.txt

Basin2_7.txt

Basin2_8.txt

Basin2_9.txt

txt

Basin3_1.txt

Basin3_3.txt

Basin3_2.txt

Basin3_10.txt

Basin3_11.txt

Basin3_12.txt

Basin3_13.txt

Basin3_4.txt

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Enclosure Example: Enclosure Example: Basin1_6.txt

Enclosure Example: Enclosure Example: Basin2_3.txt

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Pictures of the Piston Corer SamplesPictures of the Piston Corer Samples at P2 stationat P2 station: 1. 0 to 3 m; 2. 3 to 6 m;: 1. 0 to 3 m; 2. 3 to 6 m;

Thank you for your attentionThank you for your attention!!Branko!Branko!