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    Wyświetlanie 1-9 z 9
    Tytuł:
    On the generation of water waves in a flume
    Autorzy:
    Wilde, P.
    Wilde, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/241118.pdf
    Data publikacji:
    2001
    Wydawca:
    Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
    Tematy:
    water wave
    flume
    wavemaker
    horizontal motion
    piston
    Opis:
    The present paper proposes a simple model for the calculation of a time series to control the horizontal motion of the piston of a wavemaker. It is assumed that the initial conditions correspond to water at rest. It is assumed that parameters of kinematics of the fluid (displacement, velocity and acceleration fields) at the initial time are equal to zero. In the first interval the amplitudes grow to an asymptote that corresponds to a regular monochromatic wave. In the second interval the waves decay. Calculated time series were fed in to the control system of our wavemaker and the measured horizontal displacements of the piston compared. The control series was supplemented by terms corresponding to the Stokes type solution by addition of terms with multiples of the basic frequency.
    Źródło:
    Archives of Hydro-Engineering and Environmental Mechanics; 2001, 48, 4; 69-83
    1231-3726
    Pojawia się w:
    Archives of Hydro-Engineering and Environmental Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Flow characteristics after installation of floating bridge in open channel
    Autorzy:
    Ibrahim, Mohamed M.
    Eltoukhy, Mahmoud A.R.
    Ghanim, Adnan D.
    Powiązania:
    https://bibliotekanauki.pl/articles/1844336.pdf
    Data publikacji:
    2021
    Wydawca:
    Instytut Technologiczno-Przyrodniczy
    Tematy:
    floating bridges
    flow characteristics
    flume
    head loss
    velocity
    Opis:
    A pontoon bridge, also known as a floating bridge, can be used as for pedestrian and vehicle traffic. The buoyancy of the floating bridge limits the maximum load it can carry. This research included experimental runs to study variations of open channel flow characteristics upstream and downstream a floating bridge. Eighty one runs have been carried out using a flume in a hydraulic laboratory. The experimental run program is classified into two main categories; the first investigates the velocity ratios (vds/vus) downstream and upstream the floating bridge. The second category is concerned with the energy head losses (hL) due to the presence of a floating bridge. The experimental runs are carried out using three pontoon lengths, three flow depths, six submerged depths, and three discharges. The results are analysed and graphically presented to help predict hydraulic parameters. The outcomes have shown that the floating bridge upstream, Froude number and submergence of the pontoon are the dominant parameters that affect the studied flow characteristics.
    Źródło:
    Journal of Water and Land Development; 2021, 49; 244-251
    1429-7426
    2083-4535
    Pojawia się w:
    Journal of Water and Land Development
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Theoretical analysis of model seabed behavior under water wave excitation
    Autorzy:
    Sawicki, A.
    Mierczyński, J.
    Smyczyński, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/178964.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    sea bed
    liquefaction
    wave-flume experiments
    saturated soils
    Opis:
    Theoretical analysis of the behavior of a model seabed subjected to water wave excitation is presented. The experiments were performed in the wave flume at the Danish Technological University in Lyngby. Such experiments are unique in engineering sciences and therefore provide unique empirical data for testing various models of the seabed. A controversial explanation of the experiments is presented in the literature. The goal of this research was to study pore pressure changes caused by water waves and the subsequent liquefaction of the seabed. The authors of the present contribution offer their own theoretical explanation of the wave flume experiments and discuss errors found in the literature cited. The analysis is based on the classical soil mechanics, including the Biot type approach.
    Źródło:
    Studia Geotechnica et Mechanica; 2015, 37, 2; 33-37
    0137-6365
    2083-831X
    Pojawia się w:
    Studia Geotechnica et Mechanica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The contribution of Stanisław Dżułyński to flysch sedimentology: A 'Western' perspective
    Autorzy:
    Kelling, G.
    Walton, E. K.
    Simpson, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/191704.pdf
    Data publikacji:
    2007
    Wydawca:
    Polskie Towarzystwo Geologiczne
    Tematy:
    sedimentary structures
    turbidites
    Carpathian flysch
    laboratory flume studies
    knowledge transfer
    Opis:
    Abstract: In his ground-breaking research on the sedimentary structures of turbidites, Stanisław Dżułyński demonstrated and took to new levels of accomplishment the defining attributes of the Kraków School of flysch sedimentology established by Marian Książkiewicz at the Jagiellonian University. These attributes included a meticulous approach to fieldwork, the ability to recognize the scalar and vector relationships of diverse sedi- mentary features, a working knowledge of several languages, a capacity to describe systematically structures that had previously received scant attention in the world literature of geology, and innovation in the transfer of scientific knowledge. Dżułyński also added elements that were distinctively his own: a highly inventive approach to the replication of turbidite sedimentary structures in laboratory flumes, an openness to new ideas, boundless enthusiasm for his chosen field, and an exuberantly outgoing personality. In spite of worldwide recognition for his numerous and wide-ranging achievements in geology, he viewed himself first and foremost as one of the senior students of Marian Książkiewicz. In this role, Dżułyński utilised every opportunity to present with great insight and objectivity the work of the Kraków School, enthusiastically shared his extensive knowledge of sedimentology with experienced colleagues and new acquaintances alike and, in particular, gave generous encouragement to young researchers.
    Źródło:
    Annales Societatis Geologorum Poloniae; 2007, 77, No 2; 93-103
    0208-9068
    Pojawia się w:
    Annales Societatis Geologorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Assessment of submerged floor water jets to minimize the scour downstream from a stepped spillway
    Autorzy:
    Ibrahim, Mohamed M.
    Diwedar, Al Sayed Ibrahim
    Ibraheem, Ahmed Mahmoud
    Powiązania:
    https://bibliotekanauki.pl/articles/1841974.pdf
    Data publikacji:
    2021
    Wydawca:
    Instytut Technologiczno-Przyrodniczy
    Tematy:
    floor jets
    flume
    jet rows
    stepped spillway
    scour depth
    scour length
    Opis:
    Because of hydraulic jump, the scour downstream a stepped spillway is the most confusing issue that endangers the overall stability of the spillway. In this paper, thirty-six exploratory runs are described to explore the impact of utilizing submerged water jets fixed in the stilling basin of a stepped spillway on the downstream scour measurements under various flow conditions. A smooth apron where the water jets are disabled is incorporated to characterize the impact of adjustments studied. Trials are performed utilizing different upstream discharges, jets arrangements, and tailwater depths. The results are analyzed and graphically presented. The experimental data are contrasted to a scour formulae developed by other specialists. Outcomes indicated that by utilizing submerged floor water jets, the maximum scour depth is decreased between 14.3 and 36.0%. Additionally, the maximum scour length is reduced by 9.7 to 42.3%. Finally, involving regression analysis, simple formulas are developed to estimate different scour parameters.
    Źródło:
    Journal of Water and Land Development; 2021, 50; 122-129
    1429-7426
    2083-4535
    Pojawia się w:
    Journal of Water and Land Development
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Environmental Quality Management through Parshall Flume Aeration Efficiency Modelling
    Autorzy:
    Hamed, Mohamed Ahmed Reda
    Powiązania:
    https://bibliotekanauki.pl/articles/2202322.pdf
    Data publikacji:
    2023
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    aeration efficiency
    dissolved oxygen
    environmental life sustainability
    Parshall flume
    water quality
    Opis:
    The dissolved oxygen content in surface waters is one of the vital indicators for human water quality usage as well as the aquatic plant and animal environmental life sustainability. Parshall flumes are one of the important ejector devices that are successfully used for oxygen requirement satisfying in various irrigation, wastewater, and ecosystems. However, the present study aimed to manage and improve various waterworks aeration efficiency through integrated modeling of experimental and analytical analysis as well as their operation conditional parameters for the Parshall flumes configuration. On the basis of the experiment work data sets run results, the principal component regression (PCR), partial least squares (PLS), and ridge regression (RR) techniques are used to develop the required aeration efficiency prediction models for such aerators by interrelating the impact of Parshall flumes characteristics and configurations, as well as various water flow rates on aeration efficiency. The predictive models developed in the study were statistically compared to the experimental data. The comparison confirms a good reliability and high accuracy. Considering the proposed aeration models, the optimum design of the new Parshall flumes can be successfully facilitated.
    Źródło:
    Journal of Ecological Engineering; 2023, 24, 2; 124--130
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hydraulic investigation of venturi flumes
    Autorzy:
    Sawicki, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/240998.pdf
    Data publikacji:
    2001
    Wydawca:
    Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
    Tematy:
    hydraulic investigation
    venturi flumes
    standing-wave-flume
    sewage-disposal-plants
    gradually varied flow
    Opis:
    Venturi flume is a very popular measuring device. A particularly attractive version of such a device is a standing-wave-flume, as this enables determination of liquid discharge by one-point depth measurement only. However, it is necessary to underline, that some essential simplifications must be introduced into the theoretical description of this case. The paper contains the results of the control investigations of six existing Venturi flumes, installed in three functioning sewage-disposal-plants in Poland. It was shown, that some important mistakes can be committed, when somebody plans such a flume. These mistakes worsen the flow measurement accuracy. In conclusion it was stated that the standing-wave-flume must be designed very carefully, with the use of gradually-varied flow equations. An alternative, which is worth using, is a Venturi flume with two-point depth measurement.
    Źródło:
    Archives of Hydro-Engineering and Environmental Mechanics; 2001, 48, 1; 115-130
    1231-3726
    Pojawia się w:
    Archives of Hydro-Engineering and Environmental Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wykazanie możliwości stosowania urządzeń : sondy elektromagnetycznej (FLAT Model 801), hydroakustycznej (Son Tek, MicroADV) i urządzenia ADCP, do pomiarów rozkładów prędkości w warunkach laboratoryjnych
    Demonstration of the applicability of equipment : electromagnetic probe (FLAT Model 801), hydroacoustic (Son Tele MicroADV) and ADCP device for the measurement of velocity distributions in the laboratory
    Autorzy:
    Walczak, N.
    Hämmerling, M.
    Kałuża, T.
    Laks, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/270474.pdf
    Data publikacji:
    2013
    Wydawca:
    Centralny Ośrodek Badawczo-Rozwojowy Aparatury Badawczej i Dydaktycznej, COBRABiD
    Tematy:
    mierniki pomiaru prędkości
    badania laboratoryjne
    koryto hydrauliczne
    velocity measuring devices
    laboratory research
    hydraulic flume
    Opis:
    Celem badań było sprawdzenie dokładności uzyskanych wartości prędkości z wykorzystaniem laboratoryjnych i terenowych urządzeń pomiarowych. W pracy przeanalizowano wyniki uzyskane z dwóch urządzeń wykorzystywanych w badaniach terenowych. Pierwszym był przepływomierz elektromagnetyczny (FLAT Model 801), który działa na zasadzie prawa Faradaya. Jego zaletą jest brak części ruchomych, dzięki czemu pomiar nie jest obarczony błędami. Drugim przebadanym urządzeniem jest ADCP Stream Pro, który wykorzystuje występujące przy propagacji fali dźwiękowej zjawisko Dopplera, a mechanizm pomiaru polega na zmianie częstotliwości sygnału odbitego od poruszającego się obiektu. Uzyskane wyniki prędkości porównano z wynikami uzyskanymi laboratoryjną sondą hydroakustyczną (ADV), wykorzystującą zjawisko Dopplera. Sonda ADV przeznaczona jest do rejestrowania chwilowych składowych prędkości, ze stosunkowo dużą częstotliwością. Efektem pracy było wskazanie uniwersalności i ograniczeń urządzeń, które mogą jednocześnie pracować w terenie i w laboratorium.
    The aim of the research was assessing the precision of obtained velocity values with the use of laboratory and field measuring devices. The research analyses the results obtained with the use of two field measuring devices. One of them was the electromagnetic current meter (Flat Model 801), which operates on the basis of the Faraday’s law. Its advantage is the lack of moveable parts, thanks to which the measurement is not encumbered with error resulting from the mechanical nature of the propeller motion. The other field measuring device used in the research was the ADPC Stream Pro, which uses the Doppler Effect present in sound ware propagation. The measurement mechanism consist in changing the frequency of the signal reflected by the moving object. The obtained with the use by of the laboratory hydroacoustic (ADV), which uses the Doppler effect. The ADV probe registers components of the velocity vectors with a relatively high frequency. The research demonstrated the universality and limitation of the field measuring devices, which can operate both in the field and in the laboratory.
    Źródło:
    Aparatura Badawcza i Dydaktyczna; 2013, 18, 4; 341-348
    2392-1765
    Pojawia się w:
    Aparatura Badawcza i Dydaktyczna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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