Journal ArticleDOI
Control of Bed Erosion at 60° River Confluence Using Vanes and Piles
Ananth Wuppukondur,Venu Chandra +1 more
TLDR
In this article, the authors used a distorted model with a non-uniform sediment of mean particle size d¯¯ 50672 ǫ = 0.28mm with a confluence angle of 60°.Abstract:
River confluences have complex hydrodynamics than ambient flows due to different flow characteristics of the two merging flows. Secondary circulation develops due to merging of two flows which leads to bed erosion. The eroded sediment gets deposited at various locations in the downstream of the confluence. It is reported in the literature that major reservoirs in India will lose 50% storage capacity by 2020 and reservoirs all over the world lose storage capacity by as much as 5% every year. In view of controlling bed erosion at the confluence, vane and circular pile models are used as scour mitigation structures and experimental results are presented. Experiments are performed in a distorted model with a non-uniform sediment of mean particle size d
50
= 0.28 mm with a confluence angle of 60°. Two different discharge ratios (Q
r = ratio of lateral flow discharge to main flow discharge) of 0.5 and 0.75 are used with a constant flow depth (H
m) of 5 cm in the main channel. Vanes of width 0.3H
m (1.5 cm), thickness of 1 mm are placed at 15°, 30° and 60° vane angles with respect to main flow. Circular pile models of 8 and 12 mm diameter are also used. Two different spacing of 2H
m and 3H
m (10 and 15 cm) between the vanes or piles are used to perform the experiments. For Q
r = 0.5 and 0.75 using vanes, scour depth reduces by 25 and 34%, respectively. When circular pile models of 8 and 12 mm are used, the scour depth reduces by 25, 38 and 27, 43%, for Q
r = 0.5 and 0.75, respectively. The scour depth decreases with an increase of vane angle and pile diameter, but increases with an increase of spacing. Therefore, piles have better performance over vanes in reducing scour at the confluence.read more
Citations
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Journal ArticleDOI
Comparing the Scour Upstream of Circular and Square Orifices
TL;DR: In this article, the authors compared the scour pattern upstream of square and circular orifices with equal opening areas of 38.45 cm2 and found that the influence zone area upstream of the square orifice is 1.46 times larger than the circular orifice.
Journal ArticleDOI
Control of sediment inflow into a trapezoidal intake canal using submerged vanes
TL;DR: In this paper, experiments were conducted to control sediment entry into an intake channel using submerged vanes in a physical model with a rectangular mobile-bed main channel and a trapezoidal rigid-bed intake channel diverting at an angle of 45°.
Journal ArticleDOI
Improving the Hydro-Morpho Dynamics of A River Confluence by Using Vanes
Hydar Lafta Ali,Badronnisa Yusuf,Thamer Ahamed Mohammed,Yasuyuki Shimizu,Mohd Shahrizal Ab Razak,Balqis M. Rehan +5 more
TL;DR: In this article, a 2D numerical model is used in simulating hydromorpho dynamics in the rivers confluence to mitigate the erosion and deposition zones by adopting vanes as control structures.
Journal ArticleDOI
Estimation of scour depth around cross-vane structures using a novel non-tuned high-accuracy machine learning approach
TL;DR: In this article, the scour hole depth at the downstream of cross-vane structures with different shapes (i.e., J, I, U, and W) is simulated utilizing a modern artificial intelligence method entitled "Outlier Robust Extreme Learning Machine (ORELM)".
References
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Journal ArticleDOI
Investigation of Sediment Patterns at River Confluence
R Ghobadian,M. Shafai Bajestan . +1 more
Journal ArticleDOI
Enhancing Utility of Submerged Vanes with Collar
TL;DR: In this article, the advantages of using collars in case of submerged vanes and providing insight into selection of appropriate collar shapes were discussed and a collar of circular shape was found more suitable for a rectangular vane.
Journal ArticleDOI
Experimental Study of Pressure Fluctuation in Stilling Basins
TL;DR: In this article, pressure fluctuations and their locations have been studied in a physical model of Namrod Dam and the thickness of slab for different hydraulic conditions was calculated and compared in one-dimensional and two-dimensional (2D) conditions.
Journal ArticleDOI
Interaction between submerged vanes for sediment management
TL;DR: In this article, a new approach to analyze the interaction among a row of submerged vanes is described, and the results show that the sediment management capacity of a vane system comprising three vanes in a row decreases when the vane spacing is reduced.
Journal ArticleDOI
A study of the effects of the longitudinal arrangement sediment behavior near intake structures
TL;DR: In this article, the possibility of the submerged vanes to control and direct the flow and river thalweg toward the intake port with different longitudinal arrangements has been investigated and three longitudinal distances 3H, 4H, and 6H (H being the initial height of the vanes) have been considered and the experiments have been done for the regular and irregularity.