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    Wyświetlanie 1-3 z 3
    Tytuł:
    Suspended sediment in lowland rivers – towards identifying the ratios of mineral and organic components and their variation during the year
    Autorzy:
    Skolasińska, Katarzyna
    Powiązania:
    https://bibliotekanauki.pl/articles/2204356.pdf
    Data publikacji:
    2021
    Wydawca:
    Uniwersytet im. Adama Mickiewicza w Poznaniu
    Tematy:
    suspended sediment concentration
    mineral suspension
    organic suspension
    seasonal variability
    stężenie zawiesiny
    zawiesina mineralna
    zawiesina organiczna
    zmienność sezonowa
    Opis:
    Concentrations of suspended sediment transported by rivers are influenced by interactions between multiple drivers that act on a range of spatial and temporal scales. Such levels vary over the year, as well as across multi-year periods. Most conventional approaches to determining suspended load are based upon analyses of total suspended sediment concentration (SSC), i.e., the sum of mineral and organic matter. This approach makes it difficult, if not impossible, to determine the impact of multiple environmental factors on changes in suspension concentration precisely. The present paper focuses on the mineral and organic components of suspended sediment with the aim of determining how our knowledge of the share of each individual component can improve interpretations of SSC fluctuations during a hydrological year. The analysis conducted (personal and other researchers’ results) has shown that mineral and organic suspensions demonstrate mutually incompatible opposite trends under influence of environmental factors. This analysis of organic components identifies clear seasonal trends, which indicates that organic suspensions of autogenous origin have a strong influence on the dynamics of changes in suspension concentration; such analyses are rarely included in assessments of SSC dynamics.
    Źródło:
    Geologos; 2021, 27, 3; 173--180
    1426-8981
    2080-6574
    Pojawia się w:
    Geologos
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Eksperymentalne badania usuwania zawiesiny mineralnej z syfonów kanalizacji deszczowej
    Experimental Studies on Removal of Mineral Suspension from Siphons in Rain Water Piplines
    Autorzy:
    Wichowski, P.
    Zalewska, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1818626.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Koszalińska. Wydawnictwo Uczelniane
    Tematy:
    syfon
    kanalizacja deszczowa
    zawiesina mineralna
    prędkość oczyszczająca
    siphon
    storm water drainage
    mineral suspension
    speed purifying
    Opis:
    The article presents a study on purifying rainwater pipes with mineral suspension. The study was divided into two stages. In the first stage determined the flow rate of conducive to self-cleaning rainwater pipes. The study was conducted for eight granulated mineral suspension for the straight line and the siphon positioned at an angle of 0°, 30°, 60°, and 90°. Determined the minimum speed at which there was no sedimentation of the slurry flowing in a stream of water and so-called. purification speed at which followed complete purification the measuring section of the accumulated mineral suspension. On the basis of a clear trend can be seen that with the decrease in grain size of grains we observe lower speed needed to remove them. In most cases, particularly for the finer fractions, the difference between the minimum speed and the speed of purification is less than the straight section. Taking as reference the average speed of straight horizontal purification for all the granulation, the speed for the siphon: arranged at an angle of 0° is about 3% higher, at 30° is about 16% higher, at an angle of 60° by about 8% higher, and to siphon arranged at an angle of 90° by about 33% higher. From the above indicates a paradox that the siphon with an inclination of 60° in order to clean the mineral suspensions requires an average water velocity less than the level of the proximal angle of 30°. The results were discussed and compared with the recommendations of [PN EN 1671: 2001]. Even the grain of the largest granulation moved at speeds below the normative 0.7 m/s, so it is a guarantee to achieve the removal of the tested types of suspension. At the second stage for specified speed measured self-cleaning wire flush time specified dose of the suspension. On the straight horizontal and horizontal sections of the siphon the suspension moves in the form of migrant suspension. It was observed that the migration speed of the bottom slurry is variable in time. Therefore, straight horizontal section measuring divided into four sections of equal length and the time of migration suspension by the individual sections. This time depends on the granulation suspension. Finer fractions are characterized by a slowdown in the speed of movement in subsequent sections, with larger fractions of the trend is reversed. Analyzing the cleaning duration of straight horizontal depending on the weight accumulated in the benthic suspension have failed to discern clear trends. This involves a much larger number of repetitions. In the case of the siphon with an inclination angle of 0° it was difficult to identify trends as for the horizontal section. When the siphon slope at 30° and 60° results of the measurements clearing time are common pattern. Higher dose of aggregate requires a longer time for cleaning. For the siphon with a slope of 90 degrees, regardless of the number of suspensions at speeds reaching purifying cleansing followed rapid siphon.
    Źródło:
    Rocznik Ochrona Środowiska; 2015, Tom 17, cz. 2; 1642-1659
    1506-218X
    Pojawia się w:
    Rocznik Ochrona Środowiska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Gospodarka leśna a występowanie zawiesin w wodach rzek i potoków i ich oddziaływanie na ichtiofaunę i ekosystemy rzeczne
    Forest management practices and the occurrence of suspended solids in rivers and streams and their influence on ichthyofauna and river ecosystems
    Autorzy:
    Mikołajczyk, T.
    Nawrocki, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1292053.pdf
    Data publikacji:
    2019
    Wydawca:
    Instytut Badawczy Leśnictwa
    Tematy:
    lesnictwo
    gospodarka lesna
    erozja gleb
    oddzialywanie na srodowisko
    rzeki
    potoki
    wody plynace
    zanieczyszczenia wod
    zawiesina mineralna
    ladunek zanieczyszczen
    oddzialywanie na zwierzeta
    ryby
    forest management
    soil erosion
    rivers
    ichthyofauna
    gospodarka leśna
    erozja gleby
    ichtiofauna
    Opis:
    This article is based on a literature review and attempts to highlight the harmful effects of forest soil erosion on aquatic ecosystems with particular emphasis on ichthyofauna. We focus on the phenomena of excessive soil erosion caused by forest management practices and forest roads, subsequent sediment runoff as well as silting of watercourses and their impact on fish. Among others, the direct influence of the suspended sediments on fish reproduction, egg incubation, respiratory processes, growth and immunity, as well as indirect effects on habitat and migration are discussed. The authors' intention is to draw attention to this important and underestimated aspect of forest management in Poland. The aim of this publication is to bring about changes in the management of commercial forests that will minimize the erosion of forest soils, formation of high levels of suspended solids in rivers and in turn limit their negative impact on aquatic ecosystems.
    Źródło:
    Leśne Prace Badawcze; 2019, 80, 4
    1732-9442
    2082-8926
    Pojawia się w:
    Leśne Prace Badawcze
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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