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    Wyświetlanie 1-3 z 3
    Tytuł:
    Development and infill of Vistulian glacial Lake Gniew (N Poland) : a sedimentological analysis
    Autorzy:
    Błaszkiewicz, M.
    Gruszka, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/2059705.pdf
    Data publikacji:
    2005
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Vistulian
    glacial lake
    sedimentology
    glaciolacustrine deposits
    massive clay
    jökulhlaup
    Opis:
    A substantial glaciolacustrine unit in northern Poland, between the valleys of the Vistula and Wierzyca rivers, was deposited in glacial Lake Gniew during the climatic amelioration of the Late Vistulian. It covers an area of 35 km2 and has an average thickness of 7m, but locally reaches over 20 m. Four sedimentary facies are distinguished. The silty/clayey rhythmites of facies A are interpreted as varves from the central lake bottom. They represent the initial stage of lake development. Facies B is formed by a single sand layer that is interpreted as a turbidite originating during lake shallowing due to self-drainage. Facies C consists of massive clay with dropstones and dump structures. Two hypothesis regarding its genesis are put forward: the first assumes sedimentation in a shallow basin with a high input of homogenous fine-grained suspended sediment, whereas the second explains the facies as a result of amuddy jökulhlaup, pouring into Lake Gniew and being sourced from another glacial lake; further research is required to interpret this facies reliably. Facies D consists of thick silty/clayey rhythmites that are interpreted as prodeltaic deposits.
    Źródło:
    Geological Quarterly; 2005, 49, 4; 449--462
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Changes in relief of the Azau Valley in Central Caucasus Mts resulting from impact of volcanic activity and glaciers oscillations during the last 1100 years
    Autorzy:
    Łajczak, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/294899.pdf
    Data publikacji:
    2009
    Wydawca:
    Stowarzyszenie Geomorfologów Polskich
    Tematy:
    Azau Valley
    Caucasus Mts.
    glacier oscillation
    jökulhlaup effect
    Little Ice Age
    volcanic activity
    Opis:
    I analysed changes in the relief of the partly glaciated Azau Valley in the Central Caucasus, neighbouring to Elbrus volcanic cone (5643m a.s.l.) resulting from intensification of volcanic activity and valley glaciers’ oscillations during the last 1100 years. Field research, analysis of topographic maps and photographs from the last 140 years as well as information in literature were the basis for my work. I identified the most important geomorphological processes modelling the valley: a lava flow, floods of jökulhlaup type, glaciers’ transgressions and recessions, erosion of moraines and mass movements on the slopes. I distinguished eight sections of the Azau Valley varied in their relief and being under the differentiated influence of the listed geomorphological processes. The valley under question, represents the Alpine type area of typical cascade like transfer of waste material from the slope to the valley systems and further along its floor. Hanging tributary valleys on the Azau Valley slopes are valleys exporting waste material while the main valley functions as the valley importing waste material. In the period of absence of visible volcanic activity of Elbrus, the fastest changes in the Azau Valley relief take place during the recession of the valley and slope glaciers and of ice cap on this volcano. Findings proof interdependence of intensity of material aggradation in the valley and the amount of moraine deposits which can quickly erode and be transported to the stream channel, easily accessible weathered material derived from marginal ice-free areas as well as on the volume of ice melting water discharging great loads of sediment.
    Źródło:
    Landform Analysis; 2009, 11; 40-59
    1429-799X
    Pojawia się w:
    Landform Analysis
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Reflections on subglacial megafloods: their possible cause, occurrence, and consequence for the global climate
    Autorzy:
    Loon, A. J. (Tom)
    Powiązania:
    https://bibliotekanauki.pl/articles/94340.pdf
    Data publikacji:
    2009
    Wydawca:
    Uniwersytet im. Adama Mickiewicza w Poznaniu
    Tematy:
    jökulhlaup
    megafloods
    Heinrich events
    sliding layer
    subglacial lakes
    climate change
    powódź glacjalna
    warstwa poślizgowa
    jezioro podlodowcowe
    zmiany klimatu
    Opis:
    Huge water reservoirs exist subglacially, for instance in the form of lakes. Failure of a wall around such a lake underneath the central part of a large ice mass may result in huge water outbursts. The resulting megafloods will rarely be traceable along the ice front, because much power is lost by friction and because the flood spreads subglacially over a large area. Truly giant meltwater outbursts might, however, still have an enormous power when reaching the marginal area of an ice cap. Such a megaflood may both affect the integrity of the ice mass, and help create a sliding layer over which huge ice masses can be easily transported towards the ocean, thus triggering a Heinrich-like event. This would have great impact on the global climate. Some of the Heinrich events that occurred during the past hundreds of thousands of years may well have been due to giant subglacial water outbursts, and such a situation may equally well occur in the time to come.
    Źródło:
    Geologos; 2009, 15, 2; 115-128
    1426-8981
    2080-6574
    Pojawia się w:
    Geologos
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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