Temat: scour - Katalog OPAC zbiorów

Skocz do pozycji: 1.

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

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Skocz do pozycji: 2.

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

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Skocz do pozycji: 3.

Tytuł:: Experimental and numerical investigation of scour downstream contracted spillways
Autorzy:: Nasralla, Tarek H.
Powiązania:: https://bibliotekanauki.pl/articles/2073735.pdf
Data publikacji:: 2022
Wydawca:: Instytut Technologiczno-Przyrodniczy
Tematy:: buffers
contraction
downstream
Flow-3D
scour
spillway
Opis:: A study of scour downstream of free hydraulic jump in stilling basin of stepped spillways was carried out. This paper employed an experimental study to investigate the stepped spillway with the movable bed material of D50= 3.1 mm. The effect of the contraction ratio of the stepped spillway was highlighted. Different downstream divergent angle was studied to minimise the scour depth, the results showed that the relative scour depth was reduced by 23% for divergent angle is equal to 170°, different shapes of buffer in stilling basin were also studied to reduce the scour depth where the considered buffer decrease the relative scour depth up to 84%. This study was simulated by Flow 3D program to analyse the scour hole formed using velocity vectors at the bed. The simulated results well agreed with the measured data.
Źródło:: Journal of Water and Land Development; 2022, 52; 53--59
1429-7426
2083-4535
Pojawia się w:: Journal of Water and Land Development
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

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

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Skocz do pozycji: 5.

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

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Skocz do pozycji: 6.

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 (d_s). 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 d_s=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 (d_s). 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 d_s=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

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