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Wyszukujesz frazę "local scour" wg kryterium: Wszystkie pola


Tytuł:
Local Scour around Group Bridge Pier with Different Shapes
Autorzy:
Günal, M.
Gelmeran, T.
Günal, A.
Powiązania:
https://bibliotekanauki.pl/articles/1031618.pdf
Data publikacji:
2017-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
92.40.GC
92.10.WA
Opis:
This study is based on laboratory experiments for computing depth of local scour around group bridge pier, considering the effects of upstream flow conditions, size of pier, median size of bed material and spacing between bridge piers on the maximum scour depth and scour pattern around bridge piers. The study was conducted using a physical hydraulic model for bridge piers, operated under clear-water condition and using uniform cohesionless sand as bed material. Three different models of bridge piers, having different sizes were used for showing the effect of the size on the local scour.
Źródło:
Acta Physica Polonica A; 2017, 132, 3; 632-633
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study the local scour around different shapes of single submerged groyne
Autorzy:
Rashak, Budoor M.
Khassaf, Saleh I.
Powiązania:
https://bibliotekanauki.pl/articles/1844415.pdf
Data publikacji:
2020
Wydawca:
Instytut Technologiczno-Przyrodniczy
Tematy:
bed materials
bed topography pattern
local scour
single submerged groyne
Opis:
River training structures; such as submerged groynes are low profile linear structures that are generally located on the outside bank to form groynes fields and prevent the erosion of stream banks by keeping a flow away from it. In the present research, the maximum scour depth was measured based on laboratory experiments where different shapes of submerged groynes (I-shape, L-shape, T-shape) were used as sort of countermeasures to investigate about most shapes that reduce the scour around them. The result of submerged groynes showed a clear decrease in scour depth ratio due to increasing submerged ratio and increase the scour hole geometry with increasing of flow intensity, and also Froude number. The maximum scour hole in this research was observed at T-shape groyne and then followed by I-shape groyne and L-shape groyne. The maximum scour depth that cased by I-shape was more than L-shape by a percentage about 8.2%, and it was less than T-shape by a percentage about 16.4%.
Źródło:
Journal of Water and Land Development; 2020, 47; 1-9
1429-7426
2083-4535
Pojawia się w:
Journal of Water and Land Development
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental investigation for the local scour around V-shaped spur-dikes
Autorzy:
Alasadi, Layth Abdul Rasool
Khlif, Tagreed Hameed
Hassan, Fadhel Abdulabbas
Powiązania:
https://bibliotekanauki.pl/articles/36062042.pdf
Data publikacji:
2023
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:
local scour
clearwater conditions
V-shaped spur-dyke
checkmark spur-dyke
river training structure
sediment transport
Opis:
Spur-dikes are efficient hydraulic structures that are made for numerous purposes. They have one end on the stream bank and another extending into the current. As a result of the existing spur-dikes in the stream course, the local scour phenomena usually occur around them, leading to several predicaments which have been of great concern to the hydraulic engineers. For the present work, laboratory experiments were carried out to measure the scour depths around several spur-dikes located at different distances for the V-shaped one. The experiments were conducted using physical models installed in a non-curved flume with a bed with uniform cohesion-less sediment of a medium particle size (d50 = 0.7 mm). All the models were operated under the subcritical flow of clear-water conditions. The investigations include three spur-dikes (1, 2 and 3) and three distances between them (1, 1.5 and 2 of spur-dike length) as two countermeasures to minimize the local scour depths. The results showed that an increasing number of spur-dikes and the distances between them would decrease the scour depths within the limit of the present study. The experimental data were used to create a new formula of R = 0.954 that reflects a good agreement with the experimentally observed results.
Źródło:
Scientific Review Engineering and Environmental Sciences; 2023, 32, 1; 68-86
1732-9353
Pojawia się w:
Scientific Review Engineering and Environmental Sciences
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:
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
Tytuł:
Experimental investigation of local scour under two oblong piers of a bridge crossing a sharp bend river
Autorzy:
Abdulwahd, Abdulrazaq K.
Maatooq, Jaafar S.
Powiązania:
https://bibliotekanauki.pl/articles/28411623.pdf
Data publikacji:
2023
Wydawca:
Instytut Technologiczno-Przyrodniczy
Tematy:
flow intensity
local scour
oblong pier
sharp bend
Opis:
Bridges built across a river bend and supported by more than one pier has been experimentally studied regarding the shape and nature of erosion and deposition. For this purpose, a U-shaped laboratory channel was used with two oblong piers installed at different locations. The first one was at the mid-section of the upstream straight reach, whereas in the second site within the bend, the piers have been installed at sections of central angles 0°, 30°, 60°, 90°, 120°, 150°, 170°, and 180°, from the beginning to the end of the bend segment respectively. The studies were conducted under clear water and threshold flow conditions. The results show that the higher and lower values of local scour around the pier positioned close to the outer bank, are 1.803 and 0.623 times the pier width when the bridge was installed at an angle of 90° and 30° respectively. As for the pier close to the inner bank, the deepest local scour was 1.786 times of the pier width when the bridge was installed at 60° of the bend, while the least one was 0.516 times of the pier width when the bridge was located in the 180° sector. It is worth noting that the presence of piers within sector 150 is less affected by local scour than in the other sections.
Źródło:
Journal of Water and Land Development; 2023, 58; 129--135
1429-7426
2083-4535
Pojawia się w:
Journal of Water and Land Development
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The study of the local scour behaviour due to interference between abutment and two shapes of a bridge pier
Autorzy:
Muhsen, Noor A.A.
Khassaf, Saleh I.
Powiązania:
https://bibliotekanauki.pl/articles/2174307.pdf
Data publikacji:
2022
Wydawca:
Instytut Technologiczno-Przyrodniczy
Tematy:
local scour
pier shape
scour interference
spacing effect
vertical wall abutment
Opis:
Although the complexities and irrevocable consequences associated with bridge scour have attracted researchers interest, their studies scarcely indicated the effect of a bridge pier proximity to an abutment. This research aims to measure maximum scour depth and exhibit the impact of pier-abutment scour interference based on laboratory experiments where vertical-wall abutment and two shapes of a pier (oblong and lenticular) were used at three different spacings (23.5, 16.0, 9.0 cm). The results showed an obvious increase in the scour depth ratio when increasing flow intensity, Froude number, and a decreasing flow depth. They also showed that reduced pier-abutment spacing was accompanied by increase in pier scour for both shapes while decrease in abutment scour. The maximum scour depth that caused by an oblong shape was more than a lenticular shape by about 10.8%. Furthermore, new empirical equations were derived using IBM SPSS Statistics 21 with determination coefficients of 0.969, 0.974, and 0.978 for oblong, lenticular and abutment, respectively. They showed the correlation between predicted and observed data.
Źródło:
Journal of Water and Land Development; 2022, 55; 240--250
1429-7426
2083-4535
Pojawia się w:
Journal of Water and Land Development
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The influence of sandy clay bed material to local scour behaviour
Wpływ piaszczysto-gliniastego materiału podłoża na lokalne rozmycie koryta
Autorzy:
Rustiati, N. B.
Dermawan, V.
Rispiningtati, R.
Limantara, L. M.
Powiązania:
https://bibliotekanauki.pl/articles/947007.pdf
Data publikacji:
2017
Wydawca:
Instytut Technologiczno-Przyrodniczy
Tematy:
sandy clay bed material
scour depth
sluice gate
głębokość rozmycia
piaszczysto-gliniasty materiał podłoża
wrota śluzy
Opis:
As a type of gate that is used to control the water level upstream, sluice gate is the gate with simple shape and outstanding ability to flush the sediment. The operation of the gate is considered an important process. The up and down movement of the gate would affect the velocity and cause local scour as the result of fluctuating rate. This research aims to assess the effects of discharge and gate-opening height variations, as well as the type of bedchannel material, on the change of depth of scour (ds). The research was conducted of open channel flow model with a sluice gate able to up and down movement. The discharges used in the research were 9 types ranging from 1.0 to 5.0 dm3·s–1. There were 5 variations in the height of gate-opening ranging from 0.5 to 2.5 cm at intervals of 0.5 and types of channel-bed material. The results of the research showed that the depth of scour can be analysed as a function of discharge, height of gate-opening, height of water level upstream and downstream, and the type of bed material used. The scour depth equation is ds=1.7822(Q/a )1.1347 a. Calculated coefficient of determination of the relationship between two types of channel-bed material and the depth of scour was R2 = 0.946. Consequently, it can be concluded that the equation can be applied on both types of bed-channel material.
Wrota śluzy o prostym kształcie i wyjątkowej zdolności do przemywania osadu są urządzeniem do kontrolowania poziomu wody powyżej śluzy. Ważnym procesem jest sposób operowania wrotami. Ruch wrót w górę i w dół wpływa na szybkość przepływu i powoduje lokalne rozmycie dna. W badaniach prezentowanych w niniejszej pracy oceniano efekt odpływu i zmiennej wysokości otwarcia wrót oraz typu materiału podłoża na głębokość rozmycia (ds). Badania prowadzono na modelowym, otwartym kanale przepływowym z wrotami śluzy o ruchu pionowym. Zastosowano 9 prędkości przepływu – od 1,0 do 5,0 dm3·s–1 i 5 wysokości otwarcia śluzy – od 0,5 do 2,5 cm w przedziałach co 0,5 cm oraz różne typy materiału podłoża. Wyniki badań dowiodły, że głębokość rozmycia można analizować jako funkcję odpływu, wysokości otwarcia śluzy, wysokości poziomu wody powyżej i poniżej śluzy oraz typu użytego podłoża. Otrzymane równanie głębokości rozmycia ma postać ds=1,7822(Q/a )1,1347a . Obliczony współczynnik determinacji dla zależności głębokości rozmycia od dwóch typów materiału podłoża wynosił R2 = 0,946. Można zatem wnioskować, że równanie może być stosowane do obydwu typów podłoża.
Źródło:
Journal of Water and Land Development; 2017, 35; 193-202
1429-7426
2083-4535
Pojawia się w:
Journal of Water and Land Development
Dostawca treści:
Biblioteka Nauki
Artykuł
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:
An overview of bridge pier construction solutions, including the Indonesian approach
Przegląd rozwiązań konstrukcyjnych kształtu filarów mostowych z uwzględnieniem podejścia indonezyjskiego
Autorzy:
Kiraga, M.
Wicaksono, A.Y.
Powiązania:
https://bibliotekanauki.pl/articles/2083908.pdf
Data publikacji:
2020
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:
bridge structure
bridge piers
erosion
local scour
hydrotechnics
Opis:
The paper provides an overview of the shape of the bridge piers, including the Indonesian approach. Universal principles of piers construction are provided, however the construction solutions placed in tropical climate conditions are determined by regional factors, such as considerations of resistance to earthquakes, tsunamis or frequent floods. The exemplary shapes of the pillars in the plan and the ways of their foundation are presented as a result of the analysis of English, Polish and Indonesian language literature. The economic role of bridge is emphasized in the context of Indonesian archipelago, where it constitute a central component of transportation system. The damage to the bridge is becoming particularly severe for the economy of the Indonesian archipelago. Therefore other climate invoke different engineerig problems. Structural solutions, which in a way respond to adverse climatic conditions are mainly using proper reinforcement in the case of piers, the drainage systems with a higher drainage capacity and metal components anti-corrosion treatment. Factors that should be considered in the design of the bridge pier shape, size, and configuration could be variously grouped and presented. From this study, following criteria can be distinguished: stability, location, seismic load, stream pressure, aesthetic, collision risk.
Źródło:
Acta Scientiarum Polonorum. Architectura; 2020, 19, 2; 3-20
1644-0633
Pojawia się w:
Acta Scientiarum Polonorum. Architectura
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wpływ turbulencji strumienia na rozmiary lokalnego rozmycia na modelu jazu
Influence of turbulence of flow on sizes local scour on weir model
Autorzy:
Urbanski, J.
Powiązania:
https://bibliotekanauki.pl/articles/40389.pdf
Data publikacji:
2008
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:
badania modelowe
budowle wodne
jazy
przeplyw wody
rozmycie dna
rozmycie lokalne
turbulencja
bottom scour
local scour
model research
turbulence
water building
water flow
weir
Źródło:
Acta Scientiarum Polonorum. Architectura; 2008, 07, 2
1644-0633
Pojawia się w:
Acta Scientiarum Polonorum. Architectura
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:
Wpływ hydraulicznych warunków przepływu na modelu jazu na głębokość rozmycia lokalnego
Influence of flow conditions in weir model on depth of local scour
Autorzy:
Urbanski, J.
Powiązania:
https://bibliotekanauki.pl/articles/886478.pdf
Data publikacji:
2009
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:
glebokosc rozmycia
jazy
przeplyw wody
rozmycie lokalne
warunki hydrauliczne
warunki przeplywu
Opis:
Paper presented results of investigation of formation local scour on the model of weir. Investigations were conducted on model with overflow under closure, bottom of water basins, horizontal bed protection in downstream and washing-out area. As eroded material on model sorted sand was used with d50 = 1.1 mm. Purpose of investigation were recognition variability dimension of scour during of discharge for different flow condition. Investigations showed influence depth of downstream on depth of scour, influence velocity of stream on eroded process.
Źródło:
Scientific Review Engineering and Environmental Sciences; 2009, 18, 2[44]
1732-9353
Pojawia się w:
Scientific Review Engineering and Environmental Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wpływ szorstkości umocnień w dolnym stanowisku jazu na lokalne rozmycia dna
Influence of roughness of bed protection downstream of weir on local scour
Autorzy:
Urbanski, J.
Powiązania:
https://bibliotekanauki.pl/articles/886521.pdf
Data publikacji:
2008
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:
badania laboratoryjne
budowle pietrzace
dno rzeczne
koryta rzeczne
modele hydrauliczne
rozmycia
szorstkosc umocnien
umocnienia
Opis:
In paper are presented investigation results of scour downstream of weir for different roughness of bed protection. Investigations were conducted on model construction with stilling pool and horizontal bed protection about 1.0 m long. The bed protection in downstream was made as concrete and as riprap with relative roughness k = 0.028. As bed material in experiments was used sand (d50 = 1.1 mm, (d84/d16)0.5 = 1.77). In result of use rip-rap as bed protection downstream obtained reduction of velocity and turbulence intensity of stream near the bed on the length in downstream. It was infl uence on decrease of sizes of local scour.
Źródło:
Scientific Review Engineering and Environmental Sciences; 2008, 17, 2[40]
1732-9353
Pojawia się w:
Scientific Review Engineering and Environmental Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Rozwój miejscowego rozmycia w czasie na modelach jazu w dwóch skalach
Development during of local scour on models of the dam in two scales
Autorzy:
Urbanski, J.
Powiązania:
https://bibliotekanauki.pl/articles/886278.pdf
Data publikacji:
2005
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:
budowle hydrotechniczne
jazy
przeplyw wody
rozmycie dna
rozmycie lokalne
badania modelowe
Źródło:
Scientific Review Engineering and Environmental Sciences; 2005, 14, 1[31]
1732-9353
Pojawia się w:
Scientific Review Engineering and Environmental Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł

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