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    Wyświetlanie 1-4 z 4
    Tytuł:
    Hazardous radioactivity levels and heavy mineral concentrations in beach sediments of Lake Peipsi, northeastern Estonia
    Autorzy:
    Järvelill, J.-I.
    Koch, R.
    Raukas, A.
    Vaasma, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/94516.pdf
    Data publikacji:
    2018
    Wydawca:
    Uniwersytet im. Adama Mickiewicza w Poznaniu
    Tematy:
    elevated radioactivity
    risk management
    beach sediments
    heavy minerals
    Baltic States
    podwyższona radioaktywność
    zarządzanie ryzykiem
    osady plażowe
    minerały ciężkie
    kraje nadbałtyckie
    Opis:
    The present study discusses results of heavy mineral analyses and radioactivity of beach sediments of Lake Peipsi. Such analyses are commonly done globally, but had not yet been conducted for the fourth largest lake in Europe. The average heavy mineral content in Lake Peipsi beach sediments along the northern and western coast is higher than usual for Estonian coastal and Quaternary sediments. Concomitantly, elevated radioactivity levels have been measured in several places, with the highest concentrations observed at Alajõe (1885.5 Bq/kg), which is over five times more than the recommended limit. The aim of the present study is to find sites with higher radioactivity levels, because the northern coast of Lake Peipsi is a well-known recreational area.
    Źródło:
    Geologos; 2018, 24, 1; 1-12
    1426-8981
    2080-6574
    Pojawia się w:
    Geologos
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Texture and composition of the Rosa Marina beach sands (Adriatic coast, southern Italy): a sedimentological/ecological approach
    Autorzy:
    Moretti, M.
    Tropeano, M.
    van Loon, A. J.
    Acquafredda, P.
    Baldacconi, R.
    Festa, V.
    Lisco, S.
    Mastronuzzi, G.
    Moretti, V.
    Scotti, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/94295.pdf
    Data publikacji:
    2016
    Wydawca:
    Uniwersytet im. Adama Mickiewicza w Poznaniu
    Tematy:
    source-area reconstruction
    grain-size analysis
    mineralogical composition
    image analysis
    coastal erosion
    texture
    composition
    beach sands
    Rosa Marina
    Adriatic coast
    southern Italy
    rekonstrukcja obszaru źródłowego
    analiza wielkości ziarna
    skład mineralogiczny
    analiza obrazu
    erozja wybrzeża
    tekstura
    skład
    piasek plażowy
    wybrzeże Adriatyku
    południowe Włochy
    Opis:
    Beach sands from the Rosa Marina locality (Adriatic coast, southern Italy) were analysed mainly microscopically in order to trace the source areas of their lithoclastic and bioclastic components. The main cropping out sedimentary units were also studied with the objective to identify the potential source areas of lithoclasts. This allowed to establish how the various rock units contribute to the formation of beach sands. The analysis of the bioclastic components allows to estimate the actual role of organisms regarding the supply of this material to the beach. Identification of taxa that are present in the beach sands as shell fragments or other remains was carried out at the genus or family level. Ecological investigation of the same beach and the recognition of sub-environments (mainly distinguished on the basis of the nature of the substrate and of the water depth) was the key topic that allowed to establish the actual source areas of bioclasts in the Rosa Marina beach sands. The sedimentological analysis (including a physical study of the beach and the calculation of some statistical parameters concerning the grain-size curves) shows that the Rosa Marina beach is nowadays subject to erosion.
    Źródło:
    Geologos; 2016, 22, 2; 87-103
    1426-8981
    2080-6574
    Pojawia się w:
    Geologos
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Storm surges versus shore erosion: 21 years (2000–2020) of observations on the Świna Gate Sandbar (southern Baltic coast)
    Autorzy:
    Łabuz, Tomasz Arkadiusz
    Powiązania:
    https://bibliotekanauki.pl/articles/15805040.pdf
    Data publikacji:
    2022
    Wydawca:
    Uniwersytet im. Adama Mickiewicza w Poznaniu
    Tematy:
    storm surge
    sea level
    run-up
    dune erosion
    beach erosion
    sand volume changes
    Baltic Sea
    Opis:
    Based on observations spanning 21 years (2000–2020), the article studies the effects of storm surges on the shore of the Świna Gate Sandbar in the southern part of the Pomeranian Bay (southern Baltic Sea). Impacts of selected maximum storm surges in each year were assessed with respect to morphological data collected on the beach and the foredune. The data included parameters of beach-dune erosion as measured along a beach transect before and after each surge. Differences and trends in the shore erosion were related to the sea level (SL), duration of a storm surge [highest storm sea level (HSL) > 1 m], wind-wave sector and wave run-up. The relationships were explored using a sim- ple correlation analysis. The most serious erosion was observed during the heaviest surges [HSL > 1.3 m above the mean sea level (AMSL)], with a wave run-up higher than 3.2 m AMSL. Such surges occurred at about 2-year intervals. The average SL during a surge was 1.2 m AMSL, with a run-up of 2.6 m AMSL. The beach and the lower part of the shore, below that level, were eroded each year. The heaviest surges resulted in an average 5.2 m and 7.0 m dune retreat on the high-beach-accumulative shore and on the low-beach-erosive shore, respectively. The dune was not eroded when the beach height exceeded the wave run-up. The heaviest surges eroded away 12–14 m3 of the beach sand volume. The shore erosion was found to be related to the storm surge duration, the maximum SL, the run-up and the beach height prior to the surge.
    Źródło:
    Quaestiones Geographicae; 2022, 41, 3; 5-31
    0137-477X
    2081-6383
    Pojawia się w:
    Quaestiones Geographicae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The debris distribution model for removal planning of an urbanized estuarine complex
    Autorzy:
    Barrella, Walter
    Farraboti, Edineia
    Carminatto, Amanda Aparecida
    Adami, Fabiola Andrea Chofard
    Rotundo, Matheus Marcos
    Ramires, Milena
    Júnior, Miguel Petrere
    Powiązania:
    https://bibliotekanauki.pl/articles/1050755.pdf
    Data publikacji:
    2021-03-31
    Wydawca:
    Uniwersytet im. Adama Mickiewicza w Poznaniu
    Tematy:
    beach hydrodynamics
    marine waste
    anthropic litter
    stranded debris
    Opis:
    We checked the spatial pattern of debris stranding at Praia de Santos (Brazil) in the first hour after the peak of high and low tide in summer and winter. We recorded and counted 20 types of debris (natural and anthropogenic) in 6 transects arranged in 3 zones along the beach (deposition, transport, and erosion). Canonical Correspondence Analysis (CCA) showed that buoyancy was an essential property in distinguishing debris stranding behaviours. The erosion zone, closer to the estuary showed that many mollusk shells, ropes and rocks, while plastics, styrofoam and fiber nylon were in the deposition zone. Throughout the estuary, we inspected the beach, identifying sections of origin and accumulation associated with the circulation system and currents. We propose the removal and recycling of debris from accumulation sites near highways and urban systems.
    Źródło:
    Quaestiones Geographicae; 2021, 40, 1; 97-107
    0137-477X
    2081-6383
    Pojawia się w:
    Quaestiones Geographicae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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