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    Wyświetlanie 1-4 z 4
    Tytuł:
    Gravity- and Turbulence-Dominated Sediment Motion in the Clear-Water Scour Process at a Vertical-Wall Abutment in Pressurized Flow
    Autorzy:
    Radice, A.
    Ballio, F.
    Tran, C. K.
    Powiązania:
    https://bibliotekanauki.pl/articles/241458.pdf
    Data publikacji:
    2010
    Wydawca:
    Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
    Tematy:
    abutment scour
    sediment kinematics
    turbulence
    sliding
    Opis:
    Results on the motion of sediment particles on the bottom of the erosion hole are shown for a clear-water scour experiment with a vertical-wall abutment. The paper presents an investigation of particle kinematics starting from the division of the grain instantaneous movements into two populations, namely the "turbulence-dominated" events (those in which the particle motion is triggered by the turbulent flow field) and the "gravity-dominated" events (those in which the particles slide along the slopes of the scour hole due to geotechnical instability). Attention is focused on the well developed stages of the erosion process. For such experimental times, the action of the principal vortex system is particularly evident because the latter is not much stretched along the direction of the mean flow deviation, thanks to the increased flowing area. At the same time, the temporal unsteadiness of the vortices lets a bimodal behaviour of the sediments to emerge. A relevant difference has been found between the dynamics of gravity-dominated and turbulence-dominated events. In addition, it was found that the presence of geotechnical effects in the erosion hole may significantly alter the scour rate. Potential implications of the present results for the modelling of local scour processes are described.
    Źródło:
    Archives of Hydro-Engineering and Environmental Mechanics; 2010, 57, 1; 43-59
    1231-3726
    Pojawia się w:
    Archives of Hydro-Engineering and Environmental Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Artificial Neural Network for Estimation of Local Scour Depth Around Bridge Piers
    Autorzy:
    Shakir Ali Ali, Ahmed
    Günal, Mustafa
    Powiązania:
    https://bibliotekanauki.pl/articles/2097766.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
    Tematy:
    artificial neural network
    bridge pier
    hydraulics
    local scour
    Opis:
    Local scour around bridge piers impairs the stability of bridges’ structures. Therefore, a delicate estimation of the local scour depth is vital in designing the bridge piers foundations. In this research, MATLAB software was used to train artificial neural network (ANN) models with four hundred laboratory datasets from different laboratory studies, including five parameters: pier diameter, flow depth flow velocity, critical sediment velocity, sediment particle size, and equilibrium local scour depth. The outcomes present that the ANN model with the Levenberg-Marquardt algorithm and 11 nodes in the single hidden layer gives an accurate estimation better than other ANN models trained with different training algorithms based on the regression results and mean squared error values. Besides, the ANN model accurately provides predicted local scour depth and is better than linear and nonlinear regression models. Furthermore, sensitivity analysis shows that removing pier diameter from training parameters diminishes the reliability of prediction.
    Źródło:
    Archives of Hydro-Engineering and Environmental Mechanics; 2021, 68, 2; 87--101
    1231-3726
    Pojawia się w:
    Archives of Hydro-Engineering and Environmental Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On Flow-Altering Countermeasures for Scour at Vertical-Wall Abutment
    Autorzy:
    Radice, A.
    Lauva, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/241252.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
    Tematy:
    local scour
    abutment
    process dynamics
    flow-altering countermeasures
    sediment transport
    Opis:
    Results are presented for clear-water scour experiments at a vertical-wall abutment where the obstacle was modified with slots or roughening elements as flow-altering countermeasures against the erosion process. The laboratory campaign comprehended an initial experiment with an unprotected obstacle, two experiments with slots above and beneath the non-scoured bed level, respectively, and one experiment with a roughened abutment. The repeatability of the experiments was checked and found satisfactory. The measured data set consisted of (i) scour depth with time; (ii) geometry of the erosion hole; and (iii) sediment motion pattern at several evolution stages of the process. A novel feature of the work was the attempt to combine evidence on the scour depth and that on sediment motion so as to shed light on the mechanism of scour reduction by the countermeasures tested. It is argued that this strategy might furnish guidelines for future extensive investigations of scour countermeasures, aimed at finding optimal design solutions.
    Źródło:
    Archives of Hydro-Engineering and Environmental Mechanics; 2012, 59, 3-4; 137-153
    1231-3726
    Pojawia się w:
    Archives of Hydro-Engineering and Environmental Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Local scour in non-uniform bed material below a horizontal solid apron
    Autorzy:
    Zawadzki, P.
    Błażejewski, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/240972.pdf
    Data publikacji:
    2001
    Wydawca:
    Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
    Tematy:
    two-dimensional mathematical model
    local scour
    horizontal solid
    non-uniform bed material
    Opis:
    A two-dimensional mathematical model of local scour in non-uniform non-cohesive soil below a horizontal solid apron is presented. The model parameters were identified on the basis of own experimental laboratory data. Verification of the model, accomplished using other laboratory data, showed fairly good conformity, however, additional verification under field conditions is needed.
    Źródło:
    Archives of Hydro-Engineering and Environmental Mechanics; 2001, 48, 1; 3-17
    1231-3726
    Pojawia się w:
    Archives of Hydro-Engineering and Environmental Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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