piece of work:
Relative sea level changes, glacio-isostatic rebound and shoreline distribution in the confederate Baltic
Authors Sz. Uścinowicz
Abstract
The curve of comparative sea level changes was constructed on the basis of 314 dates of radiocarbon sediments from different terrestrial and marine environments. Samples for dates were taken from 163 positions located in the Polish part of the confederate Baltic and adjacent coastal zone. The construction of the curve besides uses relics of various forms related to the improvement of the coastal region and the degree of erosion surfaces, located on seismic profiles.
In late Pleistocence and early holocaust, between 13.0 and 8.5 1000 years BP, the water level tripled and declined, and the scope of fluctuations reached 25-27 m. The water level declined in utmost cases at a rate of about 100-300 mm/year and the growth rate reached about 35-45 mm/year.
In the late boreale, about 8,500 years old BP, the Baltic gained a permanent connection to the ocean at a level lower than the current 1 by about 28 m.
By the beginning of the Atlantic period, the sea level increased to about 21 m below the modern sea level (p.m.).
Over the period of 8.0-7,0 1000 years BP the sea level increased to 10 m above sea level, at an average rate of about 10 mm/year.
By the end of the Atlantic period, the sea level increased to 2.5 m above sea level, and the growth rate decreased to about 2.5 mm/year. During the first millennium of the subboreal period, the water level increased to about 1.1-1.3 m, and by the end of this period to about 0.6-0.7 m lower than the present.
In the subatlantic period, the average sea level has already changed slightly.
Glaciistotic reconstruction began about 17,5,000 years BP and ended around 9,2-9,0 1000 BP.
The full elevation scope (total uplift) during this period was about 120 m. The maximum velocity of rising motions, reaching about 45 mm/year, occurred during the period of about 12.4-12.2,000 years BP. Between about 9.0 and about 7.0 1000 years BP migrated from the confederate Baltic region to the coastal region, and from around 7.0 to about 4.0 1000 years BP had reduced movements.
Since about 4.0 1000 years BP, the position of the earth's crust has returned to a balance.
The shoreline of the confederate Baltic in late Pleistocence and early holocation have undergone fast and crucial movements respective times. She changed her position from tens of meters to a fewer miles a year. These processes took place on the seabed surface, now at a depth of about 55 to 25 m above sea level and 30 to 60 km from the present coast. In the central holocene, the coastline moved south from about 60 km in the Gulf of Pomerania to about 5 km in the Gulf of Gdańsk.
The position of the shoreline approached the modern at the end of the Atlantic period. Late holocation dominated coastal alignment processes, and the shoreline gradually approached the current position.
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