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    Wyświetlanie 1-4 z 4
    Tytuł:
    Precipitation amounts triggering landslide processes in the western part of the Nałęczów Plateau (Lublin Upland, Poland)
    Autorzy:
    Demczuk, Piotr
    Zydroń, Tymoteusz
    Szafran, Tomasz
    Powiązania:
    https://bibliotekanauki.pl/articles/15805023.pdf
    Data publikacji:
    2022
    Wydawca:
    Uniwersytet im. Adama Mickiewicza w Poznaniu
    Tematy:
    slope stability
    shallow landslide
    rainfall thresholds
    loess
    the Nałęczów Plateau
    Opis:
    This study covers the western part of Poland’s loess Nałęczów Plateau (Kazimierz Dolny, Zbędowice). Mass movements in the Lublin Upland occur during periods of increased precipitation or after a snowy and cold winter. To date, there are no comprehensive studies on active (precipitation, hydrology, vegetation, land use, anthropogenic factors) or passive factors (lithology, slope angle) causing such geohazards in this region. This area’s formations are characterised by high sensitivity to even small changes in moisture content; thus, their geotechnical parameters deteriorate as a result of precipitation or rising groundwater levels. The calculations in this study were chosen to determine the time necessary for ground response to external factors, in addition to determining the impact of these factors on decreases in the factor of safety (FS). Based on calculations in GeoStudio software, the impacts of rainfall totals and duration on slope failure, interpreted as an event where the FS falls below 1.0, were analysed. Accordingly, the threshold rainfall value was determined as the total rainfall at the time of slope failure. The study’s results indicate that loess covers are characterised by average water permeability, relatively high internal friction angles and low cohesion, which, combined with high slope inclination, favour landslide formation even when the slope is only partially saturated. The most unfavourable stability conditions occur at the beginning of spring, indicating that loess stability is significantly affected by snowmelt and precipitation at the beginning of the vegetation season, as well as the occurrence of episodic intense precipitation during the summer.
    Źródło:
    Quaestiones Geographicae; 2022, 41, 3; 33-51
    0137-477X
    2081-6383
    Pojawia się w:
    Quaestiones Geographicae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Grain-size and microstructure of the loess from closed depressions in the Naleczow Plateau (East Poland)
    Autorzy:
    Kolodynska-Gawrysiak, R.
    Trzcinski, J.
    Zaremba, M.
    Mroczek, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/971455.pdf
    Data publikacji:
    2019
    Wydawca:
    Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej
    Opis:
    The investigation was conducted in the eastern part of the Nałęczów Plateau, a region of the Lublin Upland, in eastern Poland. The loess cover of this region was formed mainly during the last glaciation, and loess accumulation lasted until 15,000–12,000 BP. The undulating loess plateau with numerous oval-shaped closed depressions (CDs) is the main landform in the study area. Particle size distribution and SEM analyses were conducted for loess profiles under the bottoms and on the slopes of 4 CDs. Grain-size distribution characteristics as well as qualitative and quantitative micromorphological characteristics of the the loess forming the bottoms and slopes of the depressions were compared and discussed. It was documented that the differences between the loess forming the bottoms and slopes of the depressions are insignificant in the case of clay fraction content, but are considerable in the case of microstructure characteristics. The differences documented result from the impact of syn- and post-depositional diagenetic processes related mainly to suffosion and hydroconsolidation occurring under the influence of water. A quantitative assessment of the morphological effects of these processes was carried out in the context of the origin of closed depressions. The morphological effect of Holocene diagenetic processes was manifested in the deepening of the initial closed depressions formed previously under the influence of primary morphogenetic processes.
    Źródło:
    Polish Journal of Soil Science; 2019, 52, 2; 295-305
    0079-2985
    Pojawia się w:
    Polish Journal of Soil Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Geological conditions of the distribution of closed depressions in the Nałęczów Plateau (Lublin Upland, E Poland): are they an origin determinant?
    Autorzy:
    Kołodyńska-Gawrysiak, R.
    Harasimiuk, M.
    Chabudziński, Ł.
    Jezierski, W.
    Telecka, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/295150.pdf
    Data publikacji:
    2015
    Wydawca:
    Stowarzyszenie Geomorfologów Polskich
    Tematy:
    closed depressions
    loess
    glacial tills
    Opis:
    Closed depressions (CDs) are landforms typical for loess areas. 1761 CDs have been inventoried within the Nałęczów Plateau. Large concentrations of CDs: 30–40 forms per km2 occur in areas where thick (more than 10 m) complex of glacigenic sediments (mainly glacial tills) or clay (limniglacial) deposits underlying loess cover. Areas with a low concentration of CDs (fewer than 10 forms per km2) correspond to areas where the loess cover lies on a bedrock (opokas) or on thin sandy-gravelly deposits. The distributions of CDs depends on the conditions of Pleistocene permafrost development and melting, linked with lithological properties of the sediments under loess cover.
    Źródło:
    Landform Analysis; 2015, 29; 9-18
    1429-799X
    Pojawia się w:
    Landform Analysis
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Assessment of soil erosion in the catchment of two combined closed depressions in the Nałęczów Plateau (Lublin Upland)
    Ocena wielkości erozji w zlewni dwóch połączonych zagłębień bezodpływowych na Płaskowyżu Nałęczowskim (Wyżyna Lubelska)
    Autorzy:
    Rafalska-Przysucha, A.
    Rejman, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/37030.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Instytut Agrofizyki PAN
    Opis:
    The aim of the study was to evaluate the intensity of soil erosion within the catchment of two closed depressions in the Nałęczów Plateau (Lublin Upland). The amount of erosion was assessed from the depth of accumulated soil material, and the calculated amount was related to the time of agricul-tural land use. The studies were carried out in the catchment of the area of 0.54 ha. Within the catchment, 75 intact soil cores were taken and analysed to determine the depth of soil horizons and accumulated soil material. Depositional soils were represented by 25 soil cores. The average thickness of the accumulated material was 0.75 m with a maximum of 1.78 m. The results showed that the catchment of two combined closed depressions evolved to the form of a small valley (trough) after 185 years of agricultural use. The volume of soil material accumulated in the catchment, calculated from the thickness of the depositional material in soil profiles collected in a regular grid, was 1797.4 m3, and the volume calculated from the profiles located in transects that crossed the catchment axis was higher by 2%. The average rate of erosion in the catchment of the two combined depressions was 24.3 Mg ha-1
    Streszczenie. Celem pracy było określenie natężenia erozji gleby w obrębie zlewni dwóch zagłębień bezodpływowych na Płaskowyżu Nałęczowskim (Wyżyna Lubelska). Wielkość erozji została określona na podstawie miąższości zgromadzonego materiału glebowego. W zlewni o łącznej powierz-chni 0,54 ha pobrano i poddano analizie 75 nienaruszonych rdzeni glebowych, w celu określenia miąż-szości poziomów glebowych oraz zakumulowanego materiału. Gleby deluwialne były reprezentowane przez 25 rdzeni. Średnia miąższość materiału zdeponowanego w zlewni wyniosła 0,75 m, a maksymalna 1,78 m. W ciągu 185 lat użytkowania rolniczego zlewnia zagłębień bezodpływowych uległa przekształ-ceniu w formę niecki. Objętość materiału zgromadzonego w zlewni, obliczona z uwzględnieniem miąż-szości materiału depozycyjnego w profilach pobieranych w regularnej siatce, wyniosła 1797,4 m3, a obliczona na podstawie profili zlokalizowanych w transektach, poprowadzonych wzdłuż i w poprzek osi zlewni była większa o 2%. Średnie roczne tempo erozji w zlewni połączonych zagłębień wyniosło 24,3 Mg.ha-1.rok-1.
    Źródło:
    Acta Agrophysica; 2015, 22, 1
    1234-4125
    Pojawia się w:
    Acta Agrophysica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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