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Rapid coastal erosion, its dynamics and cause – an erosional hot spot on the southern Baltic Sea coast

Uścinowicz Grzegorz, Uścinowicz Szymon, Szarafin Tomasz, Maszloch Elżbieta, Wirkus Kamila

Oceanologia

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2024

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Vol. 66 (2)

250--266

EN

Coastal erosion is one of the major problems in coastal management. To adapt to it, and prevent it where possible and needed, it is important to recognize the temporal and spatial scale of the phenomenon as well as its causes. This paper describes the rapid erosion rate along an approximately 2.25 km stretch of the southern Baltic coast. The erosion occurs within a nature reserve, which is not subject to direct anthropogenic impact. Historical maps and modern remote sensing were used to trace changes in the shoreline position from 1875 to the present, and detailed DTMs derived from airborne LiDAR were used to trace elevation changes of the beach and dunes over the past years. The weighted maximum annual erosion rate since 1875 averages 2.3 m. An increase in this annual erosion rate has been observed since the turn of the millennium. The maximum average erosion rate from 2001 to 2005 was 15 m/year. The erosion has caused serious changes in elevation within the inland part of the coastal zone, manifested by a reduction in the width of the beach and a decrease in the height of the beach and dunes.

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Konkrecje Fe-Mn z polskiego sektora Morza Bałtyckiego : stan wiedzy i potrzeba badań

Zglinicki Karol, Uścinowicz Szymon, Łęczyński Leszek, Szamałek Krzysztof, Jegliński Wojciech, Pączek Urszula, Bylina Paweł, Banaś Michał

Przegląd Geologiczny

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2021

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Vol. 69, nr 3

161--168

EN

Studies on Baltic nodules have been undertaken since the1920s. In the 1970sand 1980s, the Polish Geological Institute - National Research Institute conducted researches on the bottom sediments of the Baltic Sea, which allowed identifying the regions of occurrence of Fe-Mn nodules in the southern part of the Baltic Sea (Mojski, 1989-1994). Nodules from the Polish Baltic Sea Zone are the least studied element of the marine environment. So far, there is a lack of information on environmental-geological conditions of formation and occurrence of nodules, their metal resources and deposit potential. The Fe-Mn nodules may be a valuable source of information on the contamination of the Baltic Sea water and bottom sediments. In cooperation between the Institute of Oceanography of the University ofGdañsk and the Polish Geological Institute-NRI, two research cruises were carried out in August and September 2020 on a 5 X 5 km testing ground in the Gotland-Gdańsk Threshold region. The seabed surface was profiled using multibeam echo sounders and a side-scan sonar. A hundred samples of Fe-Mn nodules, 25 samples of surface sediments associated with the nodules, and25 samples of clay rocks underlain by marine sediments were collected. The extensive documentary material will enable, for the first time, to estimate the nodule resources and determine the regularity of their occurrence.

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Chronology of the last ice sheet decay on the southern Baltic area based on dating of glaciofluvial and ice-dammed lake deposits

Uścinowicz Szymon, Adamiec Grzegorz, Bluszcz Andrzej, Jegliński Wojciech, Jurys Leszek, Miotk-Szpiganowicz Grażyna, Moska Piotr, Pączek Urszula, Piotrowska Natalia, Poręba Grzegorz, Przezdziecki Piotr, Uścinowicz Grzegorz

Geological Quarterly

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2019

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Vol. 63, No. 1

193--208

EN

The paper presents the results of the first OSL dating of glaciofluvial and ice-marginal lake sediments which occur between end moraines of the Słupsk Bank and the Polish coast. The sand and gravel of glaciofluvial deltas on the Słupsk Bank were deposited most likely during a period from 14.3 ±1.2 to 16.6 ±1.4 ka ago. The deposition of silty-sandy sediments of the ice-marginal lake is dated at 14.51 ±0.81 and 14.6 ±1.4 ka years. Likewise, dates ranging from 13.74 ±0.84 to 16.70 ±1.1 ka obtained from low sandy ridges, related to the southern range of the ice-marginal lake in the Gardno-Łeba Lowland, indicate the most likely timing of their deposition. It can be concluded that a short stop of the ice sheet on the Słupsk Bank took place approximately 15.2 ka ago, which could be correlated with the position of the ice sheet front in central Skåne and in northern Lithuania at that time. Older and younger results were also obtained, except the dates mentioned above. The older ages show little sunlight exposure of sediments during their deposition. The younger dates indicate a marine origin of the sediments and show that some parts of glaciofluvial sediments were redeposited and exposed to sunlight at a later stage, most probably when dead-ice blocks were melting.

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The radiocarbon age of marine and land deposits in the southern Baltic area

Uścinowicz Szymon, Kramarska Regina, Tomczak Anna, Zachowicz Joanna

Geologos

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2000

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Vol. 5

155--163

EN

Basing on statistical analysis of ca. 150 radiocarbon dates of sediments from different environments an attempt to reconstruct the time framework of main environmental changes during the late Pleistocene and Holocene in the Southern Baltic area was made. The main results are as follow: 45 000-22 000 years BP - period of interpleniglacial (Grudziądz Interstadial), 22 000-14 500 years BP - period of the last glaciation (lack of dates for this period or uncorrected dates), 14 500-8800 years BP - beginning of the last deglaciation and development of the southern Baltic area in land conditions, 8800-5000 years BP - period of Mezoholocene (Littorina, Atlantic) transgression of the Southern Baltic with major changes of coastline, since ca. 5000 years BP - present shape of the southern Baltic with minor changes of coastline.