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Wyszukujesz frazę "ice conditions" wg kryterium: Temat


Wyświetlanie 1-2 z 2
Tytuł:
Substratum morphology and significance during the Weichselian Odra ice lobe advance in northeast Germany and northwest Poland
Autorzy:
Hermanowski, P.
Powiązania:
https://bibliotekanauki.pl/articles/94320.pdf
Data publikacji:
2015
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:
ice stream
last Scandinavian Ice Sheet
subglacial conditions
kriging
strumień lodowy
lądolód skandynawski
warunki subglacjalne
Opis:
In the Polish Lowlands, three main ice lobes, referred to as Odra, Vistula and Mazury, formed during the Last Scandinavian Glaciation. These lobes protruded at least several kilometres beyond the main ice margin and it is believed that they represent terminal parts of the ice streams. Applied geostatistical analysis based on numerous geological data has allowed an approximate reconstruction of the Odra ice lobe substratum in the area of northwest Poland and northeast Germany. A spatial representation of the Odra lobe substratum clearly illustrates the adverse slope of the glacier bed, but also indicates areas morphologically prone to ice streaming. It is suggested that the ice took advantage of local topography that enabled advance out of the Baltic basin; consequently, the ice followed a topographic low which, in combination with favourable hydraulic conditions of its substratum, likely initiated ice streaming.
Źródło:
Geologos; 2015, 21, 4; 241-248
1426-8981
2080-6574
Pojawia się w:
Geologos
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Basal till and subglacial conditions at the base of the Upper Odra Lobe (southern Poland) during the Odranian Glaciation
Autorzy:
Salamon, T.
Powiązania:
https://bibliotekanauki.pl/articles/2060468.pdf
Data publikacji:
2014
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
till
subglacial conditions
ice-sheet dynamics
Upper Odra Lobe
Pleistocene
Southern Poland
Opis:
The objective of this contribution is detail characteristics of the basal till and the conditions in the base of Upper Odra Lobe. The lobe was formed in a foremountain area. Its central part was a Niemodlin Plain and the W part of the Racibórz Basin, surrounded by areas that have a much more varied relief.Particular attention is paid to the conditions at the ice sheet base, generatingthe dynamics ofglaciermovement. The study is based on analysis of the basal till. Three sites with basal till lying on different types of substratum (more typical for the study area) are presented. The basal till of the Upper Odra Lobe is characterized by spatial variations. Different intensities of its deformation indicate that large lateral differences in conditions occurred in the lobe substratum. The lithology controlled the rate of basal water pressure, and thus the strength of both the subglacial sediments and the ice-bed coupling. Various strain rates in the till profiles indicate that the conditions at the ice-sheet base also changed with time. The ice sheet was highly mobile, even on the coarse-grained substratum. The low permeability of the Quaternary substratum, and the relatively small thickness of the Quaternary sands and gravels resulted in a high water pressure at the ice-sheet base. The movement of the Upper Odra Lobe was concentrated in the basal zone of the ice sheet. The main mechanism of basal motion was sliding and deformation of the subglacial sediments. Deformation probably occurred in restricted areas and did not have a pervasive character.
Źródło:
Geological Quarterly; 2014, 58, 4; 779--794
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-2 z 2

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