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Archiwum zmian środowiska naturalnego okresu przełomu plejstocen-holocen w basenie uniejowskim

100%
Dzieduszyńksa D.
Biuletyn Uniejowski
|
2013
|
vol. 2
39-52
EN
Archives of changes in the natural environments are gathered in various kinds of sediments, depending on the time in the history of the Earth. The Quaternary environmental variations are recorded from the ocean cores and the Greenland or Antarctic ice cores. High temporal resolution for shorter periods may be derived from annually laminated lacustrine sediments. A versatile archive for palaeogeographical reconstruction of the time of the Pleistocene-Holocene transition in the fluvial system has been found at Koźmin Las site in the Uniejów Basin of the middle Warta river valley. Well-preserved remains of pine subfossil forest as trunks and in situ stumps and accompanying organic deposits, of the late Alleröd and Younger Dryas age, have been subjected to multiproxy palaeoecological analysis and geological investigations. The sediments stored signals of a few short terrestrial events interrupted by periodic floods. It has been concluded that the forest was destroyed by deteriorating hydrological conditions or a sudden catastrophic event, like a strong wind, in response to a global climatic change of the Pleistocene-Holocene transition. The Late Weichselian natural events recorded at the site point to a possible reaction of the fluvial system in a changing climate and environment. The knowledge about the past is essential to the creation of current ecosystem management strategies.
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Historia rozwoju doliny Warty w basenie uniejowskim

63%
Petera-Zganiacz J., Forysiak J.
Biuletyn Uniejowski
|
2012
|
vol. 1
23-41
EN
The conditions existing in the Uniejów Basin were favourable to formation of outflow after successive glaciations due to subsidence in Adamow graben. The last glacial episode in this area was the Warta stage. During the recession of continental glacier the waters flew away towards the south, but when the glacier receded to the north, a valley began to form with an outflow in the northern direction. During the time of the Eemian Interglacial the valley bottom was fairly wide and it was on the ordinate of 80.0 m. above see level. In the Vistulian the aggradation tendencies dominated. A high Plenivistulian terrace formed in the Warta valley (but only in the southern part of the Uniejów Basin) and a low Late Plenivistulian terrace. On the surface of the vast low terraca there are remains of multichannel river system which formed in Younger Dryas and were reactivated in the Holocene. The Warta river-bed was gradually lowering from the begining of Holocene until the Atlantic period, when this tendency was reversed as a result of intensified human-generated supply of mineral material into the river-bed. Over the last two centuries the Warta transformed into a one-channel river in consequence of strong human impact.
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Basen uniejowski - historia i stan badań paleogeograficznych basenu uniejowskiego w badaniach Uniwersytetu Łódzkiego

51%
Dzieduszyńska D., Kittel P.
Biuletyn Uniejowski
|
2012
|
vol. 1
190-203
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