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    Wyświetlanie 1-8 z 8
    Tytuł:
    Anastomosing system of the upper Narew river, NE Poland
    Anastomozujący system górnej Narwi, NE Polska
    Autorzy:
    Gradziński, R.
    Baryła, J.
    Danowski, W.
    Doktor, M.
    Gmur, D.
    Gradziński, M.
    Kędzior, A.
    Paszkowski, M.
    Soja, R.
    Zieliński, T.
    Żurek, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/191172.pdf
    Data publikacji:
    2000
    Wydawca:
    Polskie Towarzystwo Geologiczne
    Tematy:
    anastomosing river
    depositional system
    Holocene
    Opis:
    The studied section of the upper Narew river is an example of an anastomosing system. It consists of a network of interconnected channels and interchannel areas covered with peat-forming rush and reed vegetation. The channels have low longitudinal gradient, are laterally stable, relatively deep, they have sandy bed and strongly overgrown banks. There are no natural levees built of clastic sediment. Straight-type channels dominate in the channel system. Meandering reaches lack discernible point bar topography. Vegetation plays an important role in the evolution of the anastomosing system of the Narew.
    Badany odcinek Narwi jest przykładem systemu rzeki anastomozującej. Składa się on z sieci rozdzielających się i ponownie łączących się koryt oraz z obszarów pozakorytowych, porośniętych roślinnością torfotwórczą. Koryta mają mały spadek, są stosunkowo głębokie i lateralnie stabilne, a ich brzegi są silnie zarośnięte. Większość koryt ma stosunkowo niewielką krętość, ale podrzędnie występują także odcinki kręte, typu meandrującego, pozbawione jednak dostrzegalnych łuków przyrostowych, charakterystycznych dla topografii odsypów meandrowych. Brak jest wyraźnie rozwiniętych wałów przykorytowych zbudowanych z materiału klastycznego. Roślinność odgrywa znaczącą rolę w rozwoju omawianego systemu.
    Źródło:
    Annales Societatis Geologorum Poloniae; 2000, 70, No. 3-4; 219-229
    0208-9068
    Pojawia się w:
    Annales Societatis Geologorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    In-channel accretionary macroforms in the modern anastomosing system of the upper Narew River, NE Poland
    Autorzy:
    Gradziński, R.
    Baryła, J.
    Doktor, M.
    Gmur, D.
    Gradziński, M.
    Kędzior, A.
    Paszkowski, M.
    Soja, R.
    Zieliński, T.
    Żurek, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/191527.pdf
    Data publikacji:
    2003
    Wydawca:
    Polskie Towarzystwo Geologiczne
    Tematy:
    anastomosing river
    sand bars
    vegetation
    Polska
    Opis:
    Predomination of sandy bedload is typical of the anastomosing channels of the Narew River. Several types of in-channel accretionary macroforms have been found in these channels: side bars, concave-bank bars, plug bars, point bars, linguoid bars, and mid-channel bars. The first three types are relatively rare, point bars occur only exceptionally, while linguoid bars and mid-channel bars are quite common. The bars usually occur in main channels, which are the master routes of sand transport in the whole anastomosing system of the Narew. The lower parts of the bars are built of coarse- and medium-grained sand, similarly to the sediments in the deeper parts of the channels. Fine-grained sand, locally alternating with organic-rich muddy sand, predominates usually in the upper parts; peat with high content of sand is present in the highest parts of some bars. All bars are rapidly colonised and stabilised by plants. It is for this reason and due to the low energy of the river that the bar sediments have a high preservation potential. The development of bars is usually not accompanied by lateral migration of channels. Consequently, sediment accretion in bars is one of the factors leading to gradual narrowing of channels. Deposits of some sand-bars, when preserved in fossil record, may probably be represented by characteristic "wings" in the outer parts of ribbon-like sand bodies.
    Źródło:
    Annales Societatis Geologorum Poloniae; 2003, 73, No 1; 35-53
    0208-9068
    Pojawia się w:
    Annales Societatis Geologorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fluvial architecture element analysis of the Brushy Basin Member, Morrison Formation, western Colorado, USA
    Autorzy:
    Galli, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/2077338.pdf
    Data publikacji:
    2014
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    meandering
    anastomosing
    Morrison Formation
    Kimmeridgian
    Colorado
    meandryzacja
    anastomizacja
    Formacja Morrisona
    Opis:
    The 85-m Brushy Basin Member of the Morrison Formation in western Colorado, USA, comprises dinosaur-bearing sandstones (architectural element CHR and CH), crevasse-splay deposits and minor levee deposits (architectural element CS), mudstones, marlstones, altered ash beds and minor limestones as well as caliche paleosols and noncalcareous paleosols (architectural element FF). Channel sandstones occur at five stratigraphic levels at Trail Through Time (TT), eleven levels at Fruita Paleontological Research Area (FP), and at five levels at Echo Canyon (EC). River-channel sandstones hosted by floodplain mudstones tend to have cut down to resistant caliche paleosols. Depositional facies and architectural element analysis show that the rivers were low gradient, mainly anastomosing, with perennial flow, but seasonal with “flashy” peaks in discharge. Dinosaur bone accumulations are found in some floodplain ponds. Isolated bones are present in anastomosing channel sandstones at TT and in channel sandstone 2 at EC. At FP, major accumulations of bones were rapidly buried in the deep pools at three bends in the meandering river resulting in the formation of channel sandstone 2. There is no evidence for a large lacustrine or playa system at the three localities.
    Źródło:
    Volumina Jurassica; 2014, 12, 2; 69--106
    1896-7876
    1731-3708
    Pojawia się w:
    Volumina Jurassica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Miocene anastomosing river system in the area of Konin Lignite Mine, central Poland
    Autorzy:
    Widera, M.
    Kowalska, E.
    Fortuna, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/191379.pdf
    Data publikacji:
    2017
    Wydawca:
    Polskie Towarzystwo Geologiczne
    Tematy:
    sedimentology
    fluvial deposits
    palaeochannel pattern
    anastomosing river
    sand-filled channels
    Opis:
    This sedimentological study of the Wielkopolska Member of the Miocene Poznań Formation in the Jóźwin IIB opencast lignite-mining field, central Poland, reveals a late mid-Miocene anastomosing fluvial system with ribbon-shaped channels filled mainly by sandy and muddy deposits. The fluvial system, extending across the eastern flank of the post-Mesozoic Kleczew Graben, was tributive in its eastern upper reaches, but was increasingly distributive and northwards deflected in its lower reaches near the graben axis. Lithofacies analysis of a representative palaeochannel indicates that the river discharge significantly fluctuated and that the channels were filled with mud-bearing stratified fine-grained sand by low-density tractional turbulent flow during the high and low water stages and with a massive mud or sandy mud by a high-density flow during the rising and falling stages. The spatial pattern of fluvial channels and deformation channel-fill sandbodies were controlled by the graben topography and the differential compaction of peat substrate, with possible influence of bedrock faults. The fluvial system is thought to have drained to an endorheic ‘terminal’ basin to the north, rather than into the hypothetical Baltic River and further westwards to the distant North Sea basin, as postulated by some previous authors. The present case study contributes to the known spectrum of anastomosing river systems as a sand- to mud-dominated end-member.
    Źródło:
    Annales Societatis Geologorum Poloniae; 2017, 87, 2; 157-168
    0208-9068
    Pojawia się w:
    Annales Societatis Geologorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    New insights into the genesis of the “Poznań clays” – upper neogene of Poland
    Autorzy:
    Maciaszek, Piotr
    Chomiak, Lilianna
    Urbański, Paweł
    Widera, Marek
    Powiązania:
    https://bibliotekanauki.pl/articles/395989.pdf
    Data publikacji:
    2020
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    overbank deposits
    palaeosols
    palaeochannels
    anastomosing river
    Neogene of central Poland
    Opis:
    The present study focuses on the upper Neogene deposits, called the “Poznań Clays”, that cover more than 75,000 km2 of Poland. They are situated between the first midPolish lignite seam and the glaciogenic deposits of the Pleistocene age. Lithostratigraphically, the “Poznań Clays” belong to the uppermost portion of the lignite-bearing Grey Clays Member and the whole Wielkopolska Member (Poznań Formation). The examined fine-grained sediments include mud-rich floodplain deposits with palaeosol remnants and large sandy-muddy or muddy palaeochannel bodies. Therefore, taking into account facies analysis, cross-sectional geometry, and the planform of the palaeochannels, it can be stated that the “Poznań Clays” formed in the environment of a late Neogene anastomosing river.
    Źródło:
    Civil and Environmental Engineering Reports; 2020, 30, 1; 18-32
    2080-5187
    2450-8594
    Pojawia się w:
    Civil and Environmental Engineering Reports
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The interpretative significance of ripple-derived sedimentary structures within an upper Neogene fluvial succession of central Poland
    Autorzy:
    Maciaszek, Piotr
    Chomiak, Lilianna
    Wachocki, Robert
    Widera, Marek
    Powiązania:
    https://bibliotekanauki.pl/articles/94255.pdf
    Data publikacji:
    2019
    Wydawca:
    Uniwersytet im. Adama Mickiewicza w Poznaniu
    Tematy:
    sedimentology
    depositional structures
    ripples
    anastomosing river
    sedymentologia
    struktury deponujące
    riplemarki
    rzeki anastomozujące
    Opis:
    Sedimentary structures discussed in the present study are genetically linked to ripples that consist of pure sand or alternating sand and mud layers. All types of ripple-related structures, such as climbing-ripple cross-lamination and heterolithic bedding, i.e., flaser, wavy and lenticular (nodular), have been identified for the first time in fluvial strata that have been characterised previously as commonly massive. These small-scale bedforms, produced by migrating ripples, have been documented in a fluvial channel of late Neogene age in central Poland. The abundance and co-occurrence of the structures discussed and their spatial distribution provide evidence of their formation under very low-energy conditions, when flow velocity changed markedly, but was often significantly less than 0.5 m/s. Therefore, these ripple-derived sedimentary structures are here recognised as typical of channel fills of an anastomosing river.
    Źródło:
    Geologos; 2019, 25, 1; 1-13
    1426-8981
    2080-6574
    Pojawia się w:
    Geologos
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zmiany układu koryta Chodelki koło Chodlika w późnym vistulianie i holocenie
    Autorzy:
    Dzierżak, Malwina
    Bałaga, Krystyna
    Powiązania:
    https://bibliotekanauki.pl/articles/763309.pdf
    Data publikacji:
    2013
    Wydawca:
    Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej
    Tematy:
    meandering river
    anastomosing river
    lithofacies
    palynological analysis
    rzeka meandrująca
    rzeka anastomozująca
    litofacje
    analiza palinologiczna
    Opis:
    In this paper the evolution of paleogeographic models of the middle part of the Chodelka valley near Chodlik is presented. In the relief of the bottom valley clear traces of palaeochannels are present. Lithological and palynological analysis helped distinguish two phases in the development of this river. The first phase started in Late Vistulian, and continued in the early Holocene. At that time Chodelka was an anastomosing river. But later it changed its channel pattern to the meandering one. Nowadays the Chodelka river cannot develop naturally, because its trough is largely limited by flood bank.
    Artykuł nie zawiera abstraktu w języku polskim
    Źródło:
    Annales Universitatis Mariae Curie-Sklodowska, sectio B – Geographia, Geologia, Mineralogia et Petrographia; 2013, 68, 1
    0137-1983
    Pojawia się w:
    Annales Universitatis Mariae Curie-Sklodowska, sectio B – Geographia, Geologia, Mineralogia et Petrographia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Sand- and mud-filled fluvial palaeochannels in the Wielkopolska Member of Neogene Poznań Formation, central Poland
    Autorzy:
    Widera, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/191168.pdf
    Data publikacji:
    2013
    Wydawca:
    Polskie Towarzystwo Geologiczne
    Tematy:
    fluvial lithosomes
    floodplain deposits
    channel-fill facies
    channel width-depth ratio
    hyperconcentrated flow
    anastomosing river system
    Opis:
    This study focuses on the single- and multi-storey fluvial palaeochannel lithosomes encased in mud- rich floodplain deposits in the alluvial succession of the late Neogene Wielkopolska Member of the Poznań For- mation, central Poland, well-exposed in the lignite mining pits of the region. The fluvial lithosomes include both sand-filled and mud-filled channel varieties. The channel-fill facies are not diagnostic for any particular type of fluvial system, as the fine- to very fine-grained sandy deposits are massive to trough cross-stratified and also the muddy deposits are massive to weakly flat-laminated. The scarcity of lateral accretion bedding precludes the possibility of meandering rivers, whereas the low width/thickness ratios of the palaeochannels preclude braided rivers. The width/thickness ratio is in the range of 4.5–14 (averaging 7.5) for sand-filled channels and in the range of 6–10 (averaging 9) for mud-filled ones, which indicates narrow ribbons in general classification of fluvial channel belts. The origin of the alluvial succession is attributed to a W-/NW-directed anastomosing river system characterized by laterally inactive cut-and-fill channels with cohesive and vegetated banks. The sand-filled chan- nels conveyed water and sediment discharges on a perennial basis, whereas the mud-filled conduits are thought to have been the cut-and-abandoned branches of the system, filled by overbank flooding from adjacent active channels. Minor lateral migration of channels occurred probably during periods of minimum subsidence rate, when the fluvial system was forced to develop lateral accommodation for its discharges.
    Źródło:
    Annales Societatis Geologorum Poloniae; 2013, 83, 1; 19-28
    0208-9068
    Pojawia się w:
    Annales Societatis Geologorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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