Flow Dynamics Around Permeable Spur Dike in a Rectangular Channel

Iqbal, Saman; Pasha, Ghufran Ahmed; Ghani, Usman; Ullah, Muhammad Kaleem; Ahmed, Ashfaq

doi:10.1007/s13369-020-05205-y

Cited by 27 publications

(11 citation statements)

References 41 publications

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“…The negative values of spanwise velocity at L3 were due to recirculation, which moves from downstream to upstream. These results were verified by Iqbal et al [1]. Hence the present validated computational domain can be utilized for numerical simulation.…”

Section: Model Validationsupporting

confidence: 81%

“…The depth-averaged pressure was reduced up to 45% for C-1and it was 57% for C-5 measured at M3 when compared to C-2 [17]. In different head shapes, C shape plays a vital role in turbulence reduction without adding any extra structure like protective spur [17,36], pile groups [37,38], hollow cylinders in impermeable spur to make it permeable [1] and collar around the spur [36,39].…”

Section: Turbulent Kinetic Energy Contoursmentioning

confidence: 97%

“…The discharge and flow depth in the channel were 9.75 L/s and 0.07 m, respectively. The symmetry boundary condition for the free surface was assigned; however, the bed, sidewalls, and spurs were assigned using the no-slip condition and standard wall function as used by previous researchers [1,30,31].…”

Section: Numerical Model Setup With Boundary Conditionsmentioning

confidence: 99%

“…The spur is among the most important and common river training hydraulic structures. There are various objectives, including energy dissipation [1,2], for navigational [3,4] backwards-facing step [5] and riverbank protection by diverting the flow from the riverbank towards the main flow [6]. However, their provision of either a single spur or a series depends on the situation.…”

Section: Introductionmentioning

confidence: 99%

“…It was found that spacing between the initial four emerged spurs should be less while it should be larger for the subsequent. Iqbal et al [1] investigated the permeable spurs by varying permeability to enhance the carrying capacity of the river. A series of emerged and permeable spurs were investigated to minimize the scour-responsible factors, i.e., velocity and turbulence.…”

Section: Introductionmentioning

confidence: 99%

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Investigation of Flow Dynamics Around a Combination of Different Head Shapes of Spur Dikes

2022

Teh. vjesn.

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Spur dikes are widely used as river training structures throughout the globe to improve navigation, strengthen flood protection, and save erodible banks. This study investigates the flow behaviour of multiple spurs using similar and different head shapes instead of adding an extra structure. The novelty of the study lies in finding out the best combination of head shapes among circular (C), rectangular (R), and triangular (T) that can reduce the responsible factors of scouring and erosion. The responsible factors for scour and erosion include high magnitude velocity, pressure, turbulence kinetic energy (TKE), Reynold stresses, and wall shear stresses. Nine combinations (3 same, i.e., CCC, RRR, and TTT and six different, i.e., CRC, CTC, RCR, RTR, TCT, TRT) of spurs were investigated using Computational Fluid Dynamics (CFD) code FLUENT. Firstly, in the analysis of similar head shapes, more reduction in the values of scour and erosion responsible factors were observed in CCC combination (20% in velocity, 45% in pressure, 41% in TKE, and 43% in normal Reynold stresses). Finally, the reduction was further improved in analysing different head shapes. The CTC combination showed the most effective results in reducing the prescribed factors (43% in velocity, 57% in pressure, 51% in TKE, and 54% in normal Reynold stresses) compared to both combinations of head shapes. Therefore, to protect riverbank and spur head failure due to severe turbulent flow, the combination of spurs (CTC) could be preferred.

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Section: Model Validationsupporting

confidence: 81%

Section: Turbulent Kinetic Energy Contoursmentioning

confidence: 97%

Section: Numerical Model Setup With Boundary Conditionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Investigation of Flow Dynamics Around a Combination of Different Head Shapes of Spur Dikes

2022

Teh. vjesn.

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Study on purification effect of river ammonia nitrogen and optimization of layout parameters in the combination of ecological spur dikes and deep pool shoals: Experiments and MIKE21

Wang,

Li,

Wang

et al. 2024

River Research & Apps

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The construction of ecological spur dikes and deep pool shoals can increase the diversity of water flow structures while also hastening the transport and transformation of pollutants. However, current research has paid little attention to the effects of the arrangement parameters on water purification capacity when the ecological spur dikes and deep pool shoals are combined. In this study, we investigated the purification capacity of ammonia nitrogen using the combination of spur dikes and deep pool shoals through laboratory flume experiments and numerical simulation. The laboratory flume experiments revealed that the combination of staggered spur dikes and the opposite side deep pool shoals provided the most effective purification. Secondly, in order to obtain the optimal arrangement parameters for the combination of ecological spur dikes and deep pool shoals more easily, the numerical model based on MIKE21 was validated using experimental results and applied to Section 2 of the Shiqiao River in Nanling County, Wuhu City, Anhui Province. The numerical simulation showed that the length of the spur dikes had the greatest impact on the purification effect, followed by the spacing of the spur dikes and the width of the deep pool shoals, the angle of the spur dikes, the spacing of the deep pool shoals, and the length of the deep pool shoals had the least effect. The optimal parameters for the combination of spur dikes and deep pool shoals are as follows: spur dike parameters: 60°(angle), 10 m(length), 17 m(spacing); deep pool shoal parameters: 60 m(length), 10 m(width), and 210 m(spacing).

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State-of-the-art review on stability and serviceability of dikes as a flood infrastructure and their comprehensive assessment in Indus Plain considering global climate change

Gul,

Ijaz,

Vanicek

et al. 2024

Nat Hazards

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Flow Dynamics Around Permeable Spur Dike in a Rectangular Channel

Cited by 27 publications

References 41 publications

Investigation of Flow Dynamics Around a Combination of Different Head Shapes of Spur Dikes

Investigation of Flow Dynamics Around a Combination of Different Head Shapes of Spur Dikes

Study on purification effect of river ammonia nitrogen and optimization of layout parameters in the combination of ecological spur dikes and deep pool shoals: Experiments and MIKE21

State-of-the-art review on stability and serviceability of dikes as a flood infrastructure and their comprehensive assessment in Indus Plain considering global climate change

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