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    Wyświetlanie 1-4 z 4
    Tytuł:
    Rozmycia na modelu jazu przepuszczajacego wode pod i nad zasuwa
    Local scour on dam models with outflow over and above gate
    Autorzy:
    Dabkowski, S.L.
    Siwicki, P.
    Urbanski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/40330.pdf
    Data publikacji:
    2007
    Wydawca:
    Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
    Tematy:
    przeplyw wody
    badania modelowe
    jazy
    budowle wodne
    rozmycie lokalne
    turbulencja
    rozmycie dna
    dno strumienia
    bottom scour
    local scour
    model research
    stream bottom
    turbulence
    water building
    water flow
    weir
    Źródło:
    Acta Scientiarum Polonorum. Architectura; 2007, 06, 3; 3-14
    1644-0633
    Pojawia się w:
    Acta Scientiarum Polonorum. Architectura
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Definition of dimensionless coefficient of resistance and coefficient of roughness in cross-section of stream with large roughness element
    Autorzy:
    Michalec, B.
    Strutynski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/59718.pdf
    Data publikacji:
    2010
    Wydawca:
    Polska Akademia Nauk. Stowarzyszenie Infrastruktura i Ekologia Terenów Wiejskich PAN
    Tematy:
    Rudawa River
    Bedkowka Stream
    stream
    large roughness grain
    dimensionless coefficient
    roughness coefficient
    hydraulic condition
    water flow
    flow channel bottom
    flow channel distribution
    Opis:
    The results of investigations carried out in the stream Będkówka – a left bank tributary of the Rudawa River are presented in this paper. A stream sector with large roughness element was chosen for investigations. The performed measurements included cross-section leveling and longitudinal leveling of the stream channel, bed load (sediment) sampling, and hydrometric measurements. Cross section leveling included five cross-sections in the 19-m long stream sector; these were located upstream and downstream the large roughness element and in its region. Differentiation of flow velocity in the region of large roughness element and its influence on differentiation of the load granulometric composition in the stream channel was shown. Immediately downstream the large roughness grain zone a fine grain sediment was frapped, its diameter d50 was seven to ten times smaller than that of the sediment in bed present in the stream channel. The dimensionless coefficient of resistance was calculated taking into account the equivalent bottom roughness determined in each of the examined sections by use of Gladki`s formulae. It was found that the large roughness element in the Będkówka stream caused a change of hydraulic conditions of water flow and, in consequence, the dimensionless coefficient of resistance in the grain section increased by about four times. The coefficient of channel roughness was also determined and it was shown that the coefficient of roughness in the section of large roughness element determined with consideration of the determined dimensionless coefficient of resistance increased on the average in the section of large roughness grain by over 34% in relation to the coefficient of channel roughness.
    Źródło:
    Infrastruktura i Ekologia Terenów Wiejskich; 2010, 11
    1732-5587
    Pojawia się w:
    Infrastruktura i Ekologia Terenów Wiejskich
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Streamlined topographical features in and around the Gulf of Riga as evidence of Late Weichselian glacial dynamics
    Autorzy:
    Tsyrulnikov, A.
    Tuuling, I.
    Hang, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/2060206.pdf
    Data publikacji:
    2008
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Gulf of Riga
    Baltic Sea
    Late Weichselian glaciation
    Riga ice stream
    glacial topography
    bottom relief
    Opis:
    Based on various cartographic sources, a digital terrain model and acoustic profiling data, linear relief features of glacial origin have been distin guished and analysed in the Gulf of Riga and adjacent mainland areas in order to reconstruct the dynamics and pathways of former ice streams. North-east–south-west oriented features in the till topography prevail in the central part of the gulf and along the southern coast of the island of Saaremaa, which corroborate the previously known south/south-east di rection of the main Riga ice stream. North-east to south-west directed features dominate in the Pärnu Bay and around the Irbe Strait. Similar deviations from the Riga ice stream are most likely due to ice divide zones, namely the Sakala Upland in Southern Estonia and Kurzeme in north western Latvia, which locally changed the course of the main ice flow. The influence of the Kurzeme ice divide is traceable at the bottom of the gulf up to the southern coast of Saaremaa. There is no evidence of an ice-marginal zone cross ing the central part of the Gulf of Riga as was supposed earlier. The Pandivere-Neva and Palivere ice-marginal zones, which merge on the Sorve Peninsula, probably continue offshore into the Irbe Strait. As the age of the glacier relieffeatures is poorly contained, the chronologi reconstruction of the ice dynamics is tentative.
    Źródło:
    Geological Quarterly; 2008, 52, 1; 81-81
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Studies on riverbed evolution on the Nida river at the Pinczow and Wislica gauging station
    Autorzy:
    Lapuszek, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/62286.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Stowarzyszenie Infrastruktura i Ekologia Terenów Wiejskich PAN
    Tematy:
    riverbed
    evolution
    Nida River
    river regulation
    linear regression
    river network
    catchment
    erosion
    denudation
    hydrology
    fluvial system
    long-term evolution
    bottom
    stream bed
    Opis:
    The long-term evolution of the river beds of Nida River in Pińczów and Wiślica gauging station as well as an analysis of the causes of significant cases of lowering of the bottom of stream beds are presented in the paper. The intensity of river bed evolution as a stochastic process is described with the use of a statistical model. The analysis of the intensity of the process of river bed erosion was conducted under the assumption that the observed long-term trend of the lowest annual water levels reflect the elevation of the river bottom in the same years. The recorded observations at the Pińczów and Wiślica gauging stations on the Nida River, covering over 70-year period of time, are analyzed. Observations of the variability in the studied bottom levels over the decades allow concluding that the great transformation of riverbeds occurred there. The observations and calculations show that in Pińczów multistream or meandering river bed changed into straight channel and the process of shallowing of the river bed appeared. At the Wiślica gauging station the process of riverbed erosion with the variable intensity was observed. The research shows that the causes of these changes observed in Pińczów and Wiślica are not natural, but rather of human activity.
    Źródło:
    Infrastruktura i Ekologia Terenów Wiejskich; 2011, 12
    1732-5587
    Pojawia się w:
    Infrastruktura i Ekologia Terenów Wiejskich
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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