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Wyszukujesz frazę "grain size parameters" wg kryterium: Temat

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    Wyświetlanie 1-6 z 6
    Tytuł:
    Change of grain size parameters of sediments as a result of wind activity. Barchans Jarangiyn els in Gobi, Mongolia
    Autorzy:
    Potocki, Mariusz
    Mikulska, Małgorzata
    Powiązania:
    https://bibliotekanauki.pl/articles/2029394.pdf
    Data publikacji:
    2004-06-01
    Wydawca:
    Uniwersytet Warszawski. Wydział Geografii i Studiów Regionalnych
    Tematy:
    barchans
    dune transformation
    grain size parameters
    Opis:
    Research conducted on the Jarangiyn els field on the Gobi desert in Mongolia took place during the transformation of barchans resulting from the changes in wind direction. The investigation undertaken by the authors had as its goal the evaluation of the changes in the morphology of the forms, extended by the interpretation of the grain size parameters distribution in the longitudinal profiles of the dunes. The results indicate that the processes of barchan transformation are recorded in grain size parameters.
    Źródło:
    Miscellanea Geographica. Regional Studies on Development; 2004, 11; 81-91
    0867-6046
    2084-6118
    Pojawia się w:
    Miscellanea Geographica. Regional Studies on Development
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Variability of textural characteristics of sandur deposits of Flaajókull and Falljókull (SE Iceland)
    Autorzy:
    Angiel, Piotr
    Mikulska, Małgorzata
    Powiązania:
    https://bibliotekanauki.pl/articles/2032503.pdf
    Data publikacji:
    2006-06-01
    Wydawca:
    Uniwersytet Warszawski. Wydział Geografii i Studiów Regionalnych
    Tematy:
    sandur
    coarse clastic sediments
    grain size parameters
    Iceland
    Opis:
    Studies conducted on the sandurs of Flaajókull and Falljókull aimed at the reconstruction of the dynamics of braided rivers based on the grain size parameters of deposits. The goal of the project was to estimate the degree of deposit transformation and of changes of grain size characteristics as related to the length of transport in contemporary sandur rivers.
    Źródło:
    Miscellanea Geographica. Regional Studies on Development; 2006, 12; 111-117
    0867-6046
    2084-6118
    Pojawia się w:
    Miscellanea Geographica. Regional Studies on Development
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of Postflotation Tailings in Hydroengineering Structures
    Autorzy:
    Stefaniak, K.
    Wróżyńska, M.
    Kroll, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/952360.pdf
    Data publikacji:
    2017
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    postflotation tailings
    earthen dams
    density measures
    grain size parameters
    Opis:
    Economic development stimulated by the increased demand for production of consumer goods and the growing human population result in increasing the amounts of various wastes, including tailings. Mining industry in Poland, comprising also mining of non-ferrous metal ores, is a strategic branch of the national economy and, at the same time, a leading waste producer. Tailings management is a significant problem both in Poland and worldwide. Frequently, considerable amounts of wastes are accumulated in mine spoil tips, in areas not always suitable for their deposition, thus leading to the degradation of the surrounding environment. At the huge volume of produced wastes their rational and economically viable management is becoming crucial. On the other hand, depletion of natural aggregate deposits is an important incentive to search for substitutes, which would be suitable for the development of road infrastructure or which could be used in earth structure engineering to construct hydroengineering objects. Since no profitable recovery technologies are available at present, tailings generated by copper mining are deposited in tailings storage facilities. The largest and at the same time the only currently operating facility in Poland is the Żelazny Most Mining Tailings Storage Facility, belonging to KGHM Polska Miedź S.A. The paper presents criteria for material quality and density imposed on the material embedded in the static core of the tailings pond dam. For this purpose studies were conducted to confirm applicability of sorted tailings as a material for the construction of earth structures.
    Źródło:
    Journal of Ecological Engineering; 2017, 18, 1; 113-118
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Alternative interpretations of grain-size data from Quaternary deposits
    Autorzy:
    Mycielska-Dowgiałło, Elżbieta
    Ludwikowska-Kędzia, Małgorzata
    Powiązania:
    https://bibliotekanauki.pl/articles/94466.pdf
    Data publikacji:
    2011
    Wydawca:
    Uniwersytet im. Adama Mickiewicza w Poznaniu
    Tematy:
    Quaternary deposits
    grain-size distribution
    cumulative curve
    frequency curves
    textural parameters
    osady czwartorzędowe
    skład granulometryczny
    parametry teksturale
    Opis:
    Several possibilities to present and to interpret the results of granulometric analyses of Quaternary fluvial, aeolian, glacial and wash-out slope deposits were investigated. Attention is paid particularly to the cumulative curves at a probability scale and the frequency curves, and it is shown how these curves can help to determine the sedimentary environment. The inclination of the cumulative curves in the part of the maximum proportion of a particular grain size appears significant. It appears possible to obtain information on the density and dynamics of the transporting medium from the course of the cumulative curves (inclination and spread of grain size). The examination of textural parameters allows to draw regression lines characteristic of both deposits from various sedimentary environments and deposits from one single environment but with different histories as to their transport dynamics.
    Źródło:
    Geologos; 2011, 17, 4; 189-203
    1426-8981
    2080-6574
    Pojawia się w:
    Geologos
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigations of Properties of Soil-Aggregate Mixtures
    Autorzy:
    Skrzypczak, Izabela
    Powiązania:
    https://bibliotekanauki.pl/articles/27314805.pdf
    Data publikacji:
    2022
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    soil-aggregate mixture
    strength parameters
    grain-size distribution
    optimal moisture
    mieszanka glebowo-kruszywowa
    parametry wytrzymałościowe
    rozkład wielkości ziarna
    wilgotność optymalna
    Opis:
    The subject of this paper is the evaluation of the use of waste material, which is the native soil. On the example of the base ground taken from the village of Lipie (Podkarpackie voivodeship), soil-aggregate mixtures were prepared with a different degree of addition of natural aggregate. The study analysed the quantitative and qualitative parameters of the prepared mixtures and assessed their physical and mechanical properties to determine their suitability for the construction of infrastructural facilities. It should be noted that most specifications recommend the use of primarily aggregate mixtures. The paper presents the results of a study analysing the effect of aggregate admixture to the native soil on selected physical and strength properties of the mixtures developed. The obtained results confirmed the validity of research on the use of soil-aggregate mixtures for construction purposes.
    Źródło:
    Civil and Environmental Engineering Reports; 2022, 32, 3; 116--132
    2080-5187
    2450-8594
    Pojawia się w:
    Civil and Environmental Engineering Reports
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Textural characteristics, mode of transportation and depositional environment of the Stormberg Group in the Eastern Cape, South Africa: evidence from grain size and lithofacies analyses
    Autorzy:
    Chima, Priscilla
    Baiyegunhi, Christopher
    Powiązania:
    https://bibliotekanauki.pl/articles/2204351.pdf
    Data publikacji:
    2022
    Wydawca:
    Uniwersytet im. Adama Mickiewicza w Poznaniu
    Tematy:
    grain size distribution
    textural parameters
    lithofacies classification
    hydrodynamic energy conditions
    Triassic
    Jurassic
    rozkład wielkości ziarna
    parametry teksturalne
    klasyfikacja litofacji
    warunki hydrodynamiczne
    warunki energetyczne
    trias
    jura
    Opis:
    The Stormberg Group comprises the Molteno, Elliot and Clarens formations and is one of four stratigraphical groups that make up the Karoo Supergroup in South Africa. The group is the highest unit in the Karoo Basin, representing the final phase of preserved sedimentation. The major problem with the Stromberg Group is that the mode of transport, hydrodynamic energy conditions and depositional environment are still poorly understood. For the present paper, grain size and lithofacies studies on selected sandstones from the Molteno, Elliot and Clarens formations were performed so as to elucidate their textural characteristics, depositional processes, sedimentation mechanisms and hydrodynamic energy conditions and to discriminate different depositional environments. The statistical parameters of grain size distribution (mean grain size, standard deviation, skewness and kurtosis) show that the sandstones are predominantly unimodal, fine grained, moderately well sorted, mesokurtic and near symmetrical. The bivariate diagrams of the aforementioned statistical parameters demonstrate that river and aeolian dune had the greatest impact on the depositional environments. Likewise, the C-M pattern (Passega diagram) shows that the sandstones were mostly deposited through tractive current process. Furthermore, the C-M diagram reveals the prevalence of rolling, suspension and graded suspension modes of sediment transportation. Seventeen sedimentary lithofacies were identified and grouped into seven lithofacies associations. These lithofacies associations indicate braided channel, overbank and swamp deposits for the Molteno Formation, alluvial fan/floodplain and playa deposits for the Elliot Formation and aeolian deposits for the Clarens Formation.
    Źródło:
    Geologos; 2022, 28, 1; 61--78
    1426-8981
    2080-6574
    Pojawia się w:
    Geologos
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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