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    Wyświetlanie 1-9 z 9
    Tytuł:
    Numerical modeling of ice jam formation in the Wloclawek reservoir
    Autorzy:
    Kolerski, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1934024.pdf
    Data publikacji:
    2011
    Wydawca:
    Politechnika Gdańska
    Tematy:
    ice jam
    ice dynamics
    numerical modeling
    river ice
    run-of-the-river reservoirs
    Opis:
    Ice jam formation in a run-of-the-river reservoir and the effects of ice jam on water levels and water velocity were simulated using a two-dimensional model for simulating river ice dynamics (DynaRICE). The record ice jam of January 1982 in the Wloclawek Reservoir is also examined here. The simulation showed that the ice jam in question was formed by surface ice produced in the Vistula River, upstream of the reservoir. The effect of thermal production of suspended frazil in the reservoir on ice jam was negligible. The simulated water level as well as the ice jam profile were in agreement with the observed data. The ice discharge upstream of the reservoir and the volume of ice in the Wloclawek Reservoir were calculated. The results showed that there was less ice in the reservoir than claimed in previous literature. Suspended frazil and the undercover transport mechanism were not taken into account in this study.
    Źródło:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2011, 15, 3-4; 283-295
    1428-6394
    Pojawia się w:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    SPH Modelling of Sea-ice Pack Dynamics
    Autorzy:
    Staroszczyk, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/241351.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
    Tematy:
    sea-ice dynamics
    Lagrangian description
    smoothed particle hydrodynamics
    moving boundary problem
    Opis:
    The paper is concerned with the problem of sea-ice pack motion and deformation under the action of wind and water currents. Differential equations describing the dynamics of ice, with its very distinct mateFfigrial responses in converging and diverging flows, express the mass and linear momentum balances on the horizontal plane (the free surface of the ocean). These equations are solved by the fully Lagrangian method of smoothed particle hydrodynamics (SPH). Assuming that the ice behaviour can be approximated by a non-linearly viscous rheology, the proposed SPH model has been used to simulate the evolution of a sea-ice pack driven by wind drag stresses. The results of numerical simulations illustrate the evolution of an ice pack, including variations in ice thickness and ice area fraction in space and time. The effects of different initial ice pack configurations and of different conditions assumed at the coast–ice interface are examined. In particular, the SPH model is applied to a pack flow driven by a vortex wind to demonstrate how well the Lagrangian formulation can capture large deformations and displacements of sea ice.
    Źródło:
    Archives of Hydro-Engineering and Environmental Mechanics; 2017, 64, 2; 115-137
    1231-3726
    Pojawia się w:
    Archives of Hydro-Engineering and Environmental Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Palaeoglaciology of the Weichselian Odra ice lobe, NE Germany and NW Poland
    Autorzy:
    Hermanowski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/295026.pdf
    Data publikacji:
    2010
    Wydawca:
    Stowarzyszenie Geomorfologów Polskich
    Tematy:
    subglacial drainage
    subglacial landforms
    Odra lobe
    Weichselian glaciation
    ice movement dynamics
    Opis:
    Southern part of the Scandinavian Ice Sheet terminated in large lobes projecting tens of kilometres beyond the main ice sheet margin. One of the main ice lobe was the Odra lobe localized in NE Germany and NW Poland. In this study concise description of current morphology of the Odra lobe area is given with special reference to subglacial hydraulic conditions during the ice sheet advance. Subglacial conditions were simulated by using time-dependant three-dimensional numerical model, and obtained results were compared to geological observations. The results show entire groundwater system alternation that affected the ice/bed coupling and influenced formation of specific subglacial landforms. Coupling the simulation results with empirical estimates of basal melting rate suggests that only a small fraction of basal meltwater could have drained to the ice forefield as groundwater. Adverse slope of the low-permeable ice bed hampered water drainage, and led to water accumulation at the ice/bed interface that in turn facilitated basal sliding and bed deformation.
    Źródło:
    Landform Analysis; 2010, 14; 12-24
    1429-799X
    Pojawia się w:
    Landform Analysis
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Revised stratigraphy and palaeogeography of the Rostan Hills in northwestern Ukraine
    Autorzy:
    Rychel, Joanna
    Orłowska, Anna
    Zbucki, Łukasz
    Nowacki, Łukasz
    Zalesskij, Ivan
    Powiązania:
    https://bibliotekanauki.pl/articles/2025050.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    ice-sheet dynamics
    petrographic analysis
    lithofacies analysis
    Elsterian ice sheet
    MIS 12
    NW Ukraine
    Opis:
    This paper presents a new approach to stratigraphy and palaeogeography of NW Ukraine. So far, the glacial landforms near the Rostan area have been interpreted as end moraines derived from the Saalian ice-sheet. Sedimentological and petrographic analyses conducted at the Rostan site shed new light on the dynamics and age of the ice-sheet that formed the examined glaciogenic forms. Sedimentological analysis of glacial deposits documented the sedimentary environment of a glaciofluvial fan deposited by the ice-sheet front characterised by varying dynamics, i.e. advancing, stationary and retreating. Petrographic analysis proved an older age of deposits, i.e. Elsterian, and not Saalian as interpreted so far. These results shed new light on palaeogeography and stratigraphy of this area. The occurrence of the Elsterian deposits on the surface gives evidence of the absence of younger – Saalian – glaciation in this area, which relates to the recently announced new approaches to palaeogeography and stratigraphy of neighbouring areas in eastern Poland.
    Źródło:
    Studia Quaternaria; 2021, 38, 1; 33-41
    1641-5558
    2300-0384
    Pojawia się w:
    Studia Quaternaria
    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
    Tytuł:
    Drenaż subglacjalny i jego wpływ na dynamikę lobu Odry zlodowacenia wisły
    Subglacial drainage and its influence on the dynamics of the Weichselian Odra lobe
    Autorzy:
    Hermanowski, P.
    Piotrowski, J. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2074717.pdf
    Data publikacji:
    2009
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    drenaż subglacjalny
    lob Odry
    dynamika ruchu lodowca
    zlodowacenia Wisły
    subglacial drainage
    Odra lobe
    groundwater
    ice movement dynamics
    Weichselian glaciation
    Opis:
    In this paper we have analyzed the influence of the Weichselian ice sheet advance on the groundwater system in the Odra lobe area using hydrogeological numerical modelling performed with the finite difference method. The results indicate entire re-organization of the groundwater system in relation to non-glacial times mainly affecting the flow directions, velocities and fluxes. The re-organization of groundwater flow was caused by the pressure gradient imposed by the sloping ice sheet surface especially obvious under the ice margin and some distance in front of it. Simulated groundwater flow velocities are significantly higher than the present velocities in that area while the major groundwater flow direction is to the south, i.e. opposite to the present direction. Coupling the simulation results with assumed basal melting rate suggests that only a small fraction of basal meltwater [~24%) could have drained through the bed. The surplus water likely accumulated at the ice/bed interface facilitating faster ice flow of the Odra lobe due to enhanced basal sliding and bed deformation.
    Źródło:
    Przegląd Geologiczny; 2009, 57, 6; 504-512
    0033-2151
    Pojawia się w:
    Przegląd Geologiczny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Consequences of global warming in cryosphere
    Autorzy:
    Jania, Jacek A.
    Powiązania:
    https://bibliotekanauki.pl/articles/703326.pdf
    Data publikacji:
    2008
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    cryosphere
    climate warming
    sea ice
    glacier dynamics
    sea level rise
    Opis:
    Scale of changes of particular components of cryosphere due to global warming is presented. Cryosphere diminishes its spatial extend and the total volume of all kinds of ice is reduced. The Arctic sea ice cover has recently diminished most intensely. It reached its minimal extend (4.28 mln km2) in September 2007. One expects accelerated disintegration of sea ice of the Arctic as a result of coadjuvancy of oceanic and atmospheric factors. In consequence, more intense warming of climate coming from warmer ocean water is predicted in the Arctic basin. Increase of melting of glaciers during the last three decades results in decrease of their extend and thickness. Additionally, more meltwater is reaching bed of glaciers and is accelerating their flow velocity due to faster basal sliding. Such processes result in more intense breaking off the icebergs from fronts of glaciers terminating into the sea. Dynamic response of Greenland outlet tidewater glaciers has been detected after 2000 and it affects significantly global ocean level rise by ca 0.5 mm/yr. The Antarctic Ice Sheet is actually only insignificantly reacting to global warming. The paper discusses possible scenarios of the consequences of dynamic reaction of the West Antarctic Ice Sheet for increasing warming and slow sea level rise. Permafrost is reacting in a less distinct but detectable scale. The paper is giving not only description of consequences of climate warming for cryosphere, important impact of its spatial extend and features on atmosphere and oceans are considered either. A series of positive feedacks between  warming climate and cryosphere are listed. Described evolution of cryosphere is suggesting that distinct trend of climate warming is irreversible for the next centuries. One can also expect systematic rise of global ocean level as the consequence of glacier melting and dynamic transfer of ice masses based on land to the sea.
    Źródło:
    Nauka; 2008, 3
    1231-8515
    Pojawia się w:
    Nauka
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Budowa geologiczna i morfogeneza Wzniesienia Elbląskiego w świetle zróżnicowanej dynamiki lądolodu zlodowacenia wisły
    Geological structure and morphogenesis of the Elbląg Elevation in the light of diversified dynamics of the vistulian ice sheet
    Autorzy:
    Pikies, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/2061669.pdf
    Data publikacji:
    2016
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    zlodowacenie wisły
    dynamika lądolodu
    glacitektonika i neotektonika
    niecka Morza Bałtyckiego
    Wzniesienie Elbląskie
    Vistula glaciation
    dynamics of ice sheet
    glaciotectonics and neotectonics
    Baltic Sea Depression
    Elbląg Elevation
    Opis:
    Wśród głównych czynników wpływających na budowę geologiczną Wzniesienia Elbląskiego należy wymienić glacitektonikę oraz neotektonikę, które niewątpliwie są ze sobą przyczynowo-skutkowo powiązane. Intensywność i skalę procesów glacitektonicznych rozpatrzono po raz pierwszy z perspektywy dynamiki transgresji lądolodów zlodowacenia wisły z obszaru Morza Bałtyckiego. Budowa geologiczna, morfologia i batymetria południowo-wschodniej części dna Bałtyku Centralnego wskazują, że na tym obszarze kształtowały się ważne elementy dynamiki transgresji lądolodu stadiału górnego zlodowacenia wisły, w południowym sektorze jego oddziaływania. Rezultatem zróżnicowanej dynamiki były strumienie lodowe (strumienie lodowe wg Punkariego, 1997), wyprowadzające główną część masy lodowej z czaszy lądolodu, co powodowało, że napływ mas lodowych na obszar Niżu Polski nie był równoczesny i odbywał się z różną siłą. Tym regułom podlegał również obszar Wzniesienia Elbląskiego, gdyż w pierwszej kolejności znajdował się w polu zróżnicowanego oddziaływania strumienia B3, nasuwającego się na obszar Niżu Polski z rejonu subpołudnikowej megadepresji Głębi Gotlandzkiej i Głębi Gdańskiej. W stosunku do obszaru Wzniesienia Elbląskiego dokonano w ujęciu czasowym oceny skali oddziaływania i intensywności procesów glacitektonicznych. Szczególnie silne odkształcenia glacitektoniczne zachodniego skłonu tego wzniesienia powiązano z obecnością północnego odcinka dużego subpołudnikowego uskoku Iława–Elblag, pokrywającego się z zachodnią granicą Wzniesienia Elblaskiego. Prawdopodobną przyczyną rozwoju procesów glacitektoncznych w środkowej i górnej części zlodowacenia wisły mogła być zmiana reżimu pola naprężeń neotektonicznych w szerokiej aureoli wału kujawsko-pomorskiego, do której doszło prawdopodobnie u schyłku interglacjału eemskiego.
    Glaciotectonic and neotectonic processes are among the key factors influencing the geological structure of the Elbląg Elevation. The former is undoubtedly interrelated with the latter. Intensity and scale of glaciotectonic processes were for the first time examined from the point of view of transgression dynamics of the Vistulian continental glaciers, advancing from the Baltic Sea area. Geological structure, morphology and bathymetry of the eastern part of the Central Baltic Sea bottom show that main elements of the dynamics were shaped in this area. The diversified dynamics resulted in the formation of ice streams, carrying the major part of ice mass out of the ice sheet. It also caused that the advance of the ice sheet over the Polish Lowlands was not synchronous and occurred with various intensity. The Elbląg Elevation was subjected to these rules, because it was the first to be situated within the diverse force of interaction field with ice stream B3 (streams according to Punkari, 1997), advancing towards the Polish Lowlands from the area of a submeridional megadepression of the Gotland Deep and the Gdańsk Deep (south-eastern part of Central Baltic Sea). As regards the Elbląg Elevation area, an evaluation of the scale and intensity of glaciotectonic processes in time has been performed. Especially strong glaciotectonic disturbances, appearing on the western slope of this elevation, have been related to the presence of the distinct, submeridionally oriented fault zone Iława–Elbląg (its northern part), which coincides with the western boundary of this elevation. The likely reason for the development of glaciotectonic deformation during the middle and upper parts of the Vistula Glaciation might habve been the change of the regime of neotectonic stress field, operating within the broad foreland of the Kuyavian-Pomeranian Swell, which probably took place at the end of the Eemian Interglacial.
    Źródło:
    Biuletyn Państwowego Instytutu Geologicznego; 2016, 467; 41--61
    0867-6143
    Pojawia się w:
    Biuletyn Państwowego Instytutu Geologicznego
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Simulation of rime icing and its effects on aerodynamic characteristics of an airfoil
    Autorzy:
    Sznajder, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/243475.pdf
    Data publikacji:
    2018
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    computational fluid dynamics
    aerodynamics
    two-phase flow
    simulation of ice accretion
    heat exchange
    aircraft engineering
    transport
    vehicle
    Opis:
    A mathematical model for simulation of icing dedicated to simulation of ice accretion and its effects on aircraft aerodynamic characteristics in conditions of rime icing is presented. Pure rime icing occurs at lower temperatures than glaze icing and results in higher roughness of the surface of deposited ice. The model accounts for increased surface roughness, in terms of equivalent sand grain roughness, caused by deposited rime ice, which influences generation and dispersion of heat in the boundary layer. Increase of surface roughness is determined by analytical models created upon experimental data obtained in icing wind tunnels. Increased generation of heat is a result of increased tangential stress on the surface and is quantified in the temperature recovery factor determined numerically by a CFD solver. Effects of surface roughness on the intensity of forced convection are quantified by application of Colburn analogy between heat and momentum transfer in the boundary layer, which allows assessment of heat transfer coefficient for known friction coefficient, determined by CFD. The computational method includes determination of the surface distribution of mass of captured water in icing conditions. The model of freezing of captured water accounts for generation of heat due to latent heat of captured water droplets, temperature recovery in boundary layer and kinetic energy of captured droplets. The sinks of heat include forced convection, heating of super cooled droplets, conduction of heat through the ice layer and sublimation. The mathematical model is implemented as user-defined function module in ANSYS Fluent solver. The results include effects of deposited ice, including increased surface roughness on aerodynamic characteristics of an airfoil.
    Źródło:
    Journal of KONES; 2018, 25, 3; 437-443
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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