Impact of sand extraction from the bottom of the southern Baltic Sea on the relief and sediments of the seabed

• Autorzy: Uścinowicz S. , Jegliński W. , Miotk-Szpiganowicz G. , Nowak J. , Pączek U. , Przezdziecki P. , Szefler K. , Poręba G.

Identyfikatory

DOI

10.5697/oc.56-4.857

• Języki publikacji: EN

Abstrakty

EN

Investigations of the geological structure and seabed dynamics as well as the morphological and sedimentological effects of sand extraction generated by different mining techniques were carried out in Polish waters of the Baltic Sea, NW of the Gulf of Gdańsk, at a water depth of 15-17 m. Three research cruises took place: just before, directly after and 11 months after dredging operations. Seismoacoustic profiling, a multibeam echosounder, a side-scan sonar, a 3 m vibro-corer and a box-corer were used during the research cruises. The grain size distribution and ¹³⁷Cs content of the sand samples were determined. Marine shells were dated by the AMS¹⁴C technique and pollen analyses were carried out on samples of muddy sands lying below the marine sand. A 2 to 4.5 m thick layer of marine sands lies on the boulder till and locally on late Pleistocene ice margin lake deposits. The ¹³⁷Cs content indicates that the 0.4-0.8 m thick sand layer is mobile during storms. After the dredging operations, four pits with diameters from 80 to 120 m, depths from 3 to 4.5 m and slopes with gradients up to 30-55° were measured. Several smaller irregularly shaped pits and double furrows 30-150 m in length and 0.3-0.5 m in depth were found. The sonar mosaic also shows a 50-100 m buffer zone of fine sand around the pits which flowed over the dredger's side with water and settled on the bottom. During one year after the dredging operation the furrows generated by trailer suction hopper dredging as well as the fine sand cover around the pits disappeared completely. The four post-dredging pits left by stationary suction dredging were shallower by 2-2.5 m, their diameters increased by 40-50 m, the gradient of the slopes was reduced by up to 5-10°, and the total volume was only about 3.5% smaller than directly after dredging.

Słowa kluczowe

EN

sand extraction; dredging effects; seabed dynamics; regeneration; Southern Baltic

• Wydawca: Polish Academy of Sciences, Institute of Oceanology ; Elsevier
• Czasopismo: Oceanologia
• Rocznik: 2014
• Tom: No. 56 (4)
• Strony: 857--880
• Opis fizyczny: Bibliogr. 20 poz., mapka, wykr.

Twórcy

autor

Uścinowicz S.

• Polish Geological Institute - National Research Institute, Marine Geology Branch, Kościerska 5, 80-328 Gdańsk, Poland

autor

Jegliński W.

• Polish Geological Institute - National Research Institute, Marine Geology Branch, Kościerska 5, 80-328 Gdańsk, Poland

autor

Miotk-Szpiganowicz G.

• Polish Geological Institute - National Research Institute, Marine Geology Branch, Kościerska 5, 80-328 Gdańsk, Poland

autor

Nowak J.

• Maritime Institute in Gdańsk, Długi Targ 41/42, 80-830 Gdańsk, Poland

autor

Pączek U.

• Polish Geological Institute - National Research Institute, Marine Geology Branch, Kościerska 5, 80-328 Gdańsk, Poland

autor

Przezdziecki P.

• Polish Geological Institute - National Research Institute, Marine Geology Branch, Kościerska 5, 80-328 Gdańsk, Poland

autor

Szefler K.

• Maritime Institute in Gdańsk, Długi Targ 41/42, 80-830 Gdańsk, Poland

autor

Poręba G.

• Department of Radioisotopes, Institute of Physics CSE, Silesian University of Technology, Krzywoustego 2, 44-100 Gliwice, Poland

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