scholarly journals Investigation of Local Scour Hole Dimensions around Circular Bridge Piers under Steady State Conditions

Teknik Dergi ◽  
2022 ◽  
Author(s):  
Ömer Yavuz ESKİ ◽  
Aysegul OZGENC AKSOY
Keyword(s):  
Steady State ◽  
Local Scour ◽  
Bridge Piers ◽  
Scour Hole ◽  
Scour Hole Dimensions ◽  
Hole Dimensions

scholarly journals Using side flow jets as a scour countermeasure downstream of a sluice gate

2021 ◽  
Vol 10 (1) ◽  
Author(s):  
Mohamed S. Abdelmoaty ◽  
Mahmoud Zayed
Keyword(s):  
Energy Dissipation ◽  
Local Scour ◽  
Sluice Gate ◽  
Remarkable Effect ◽  
Scour Hole ◽  
A New Technique ◽  
Scour Hole Dimensions ◽  
The Stability ◽  
Hole Dimensions ◽  
Side Flow

Abstract Background Local scour is one of the main problems affecting the stability and operation of control hydraulic structures. Many techniques were used to control the resulting scour. In the recent study, a new technique was used to control local scour downstream single-gate hydraulic regulator by using side flow jets. This study aimed to demonstrate the effect of side jets at different angles on the local scour parameters (depth, length, and volume) and energy dissipation in the downstream hydraulic regulator. Results A physical model was used to represent the open channel, regulator, and the side jets with different angles. Five flow discharges, four jet angles, and three gate openings were applied through the experiment. The experiment results showed that the presence of side jets had a remarkable effect on the parameters of the local scour hole and energy dissipation. They dissipated more energy of hydraulic jump than in the absence of jets, and consequently, scour hole dimensions were significantly reduced. Regression analysis was used to deduce equations that can predict the development of local scour downstream sluice gate considering the inclination angle of side flow jets under different flow conditions. Conclusions Side flow jets can be used as scour reducer techniques with the advantages of eliminating the jet clog produced from sediments and suspended solids.

CFD prediction of local scour hole around bridge piers

2012 ◽  
Vol 19 (1) ◽  
pp. 273-281 ◽  
Author(s):  
Zhi-wen Zhu ◽  
Zhen-qing Liu
Keyword(s):  
Local Scour ◽  
Bridge Piers ◽  
Scour Hole

scholarly journals Application of neuro-fuzzy model to estimate the characteristics of local scour downstream of stilling basins

2009 ◽  
Vol 12 (2) ◽  
pp. 201-211 ◽  
Author(s):  
J. Farhoudi ◽  
S. M. Hosseini ◽  
M. Sedghi-Asl
Keyword(s):  
Fuzzy Model ◽  
Local Scour ◽  
Bridge Piers ◽  
Type I ◽  
Effective Parameters ◽  
Promising Alternative ◽  
Neuro Fuzzy ◽  
Scour Hole ◽  
Stilling Basins ◽  
Tail Water

The local scour phenomenon in the vicinity of bridge piers and stilling basins has received considerable attraction from designers due to its consequences which may endanger these structures. Various factors govern the pattern of scour evolution which results in the complexity of this phenomenon. Many researchers indicated that the use of fuzzy logic in modeling this phenomenon could be a promising alternative to reflect the vagueness and ambiguity of effective parameters. The aim of this study is to investigate the performance of a neuro-fuzzy model based on Takagi and Sugeno's theory in estimating the maximum depths, pattern and time evolution of scour hole downstream of a stilling basin of U.S.B.R. type I. The investigation was conducted under various discharges, tail-water depths (low, balanced and high), different bed materials and model sizes. The characteristics of the equilibrium state of the scour phenomenon as well as the time to reach the maximum scour depth were considered. The results showed a significant conformity between estimated and experimental data which recommends an acceptable outcome using a neuro-fuzzy model to forecast the properties of scour hole downstream of stilling basins. This would contribute to predicting the design geometry of stilling pools and taking the appropriate precautions to protect the downstream channel bed.

scholarly journals Improving the 2D Numerical Simulations on Local Scour Hole around Spur Dikes

Water ◽  
2021 ◽  
Vol 13 (11) ◽  
pp. 1462
Author(s):  
Chung-Ta Liao ◽  
Keh-Chia Yeh ◽  
Yin-Chi Lan ◽  
Ren-Kai Jhong ◽  
Yafei Jia
Keyword(s):  
Numerical Simulation ◽  
Three Dimensional ◽  
Local Scour ◽  
Bridge Piers ◽  
Scour Depth ◽  
Foundation Design ◽  
Mobile Bed ◽  
Scour Hole ◽  
Scour Holes ◽  
Spur Dikes

Local scour is a common threat to structures such as bridge piers, abutments, and dikes that are constructed on natural rivers. To reduce the risk of foundation failure, the understanding of local scour phenomenon around hydraulic structures is important. The well-predicted scour depth can be used as a reference for structural foundation design and river management. Numerical simulation is relatively efficient at studying these issues. Currently, two-dimensional (2D) mobile-bed models are widely used for river engineering. However, a common 2D model is inadequate for solving the three-dimensional (3D) flow field and local scour phenomenon because of the depth-averaged hypothesis. This causes the predicted scour depth to often be underestimated. In this study, a repose angle formula and bed geometry adjustment mechanism are integrated into a 2D mobile-bed model to improve the numerical simulation of local scour holes around structures. Comparison of the calculated and measured bed variation data reveals that a numerical model involving the improvement technique can predict the geometry of a local scour hole around spur dikes with reasonable accuracy and reliability.

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