Role of Grouped Piles on Flow Characteristics Around Impermeable Spur Dike

Haider, Rizwan; Qiao, Dongsheng; Wang, Xinlong; Yan, Jun; Ning, Dezhi

doi:10.1007/s40999-022-00706-3

Cited by 9 publications

(2 citation statements)

References 39 publications

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“…Among them, the CD-ST15 produced the smallest scour hole depth compared to CD-ST5 and CD-ST10, because the combined dike with 15 piles enables maximum flow passage, while the smallest scour depth is achieved by ST due to geometric parameters. The greater magnitude of scour depth with maximum IPD length (17.5 cm) makes sense because considering flows with relatively high Froude numbers have accelerated flow rates [51], that also intensifies the shear stress trying to act on the bed, leading to the formation of a deep scour hole. This observation is corroborated by recent studies [11,52,53].…”

Section: Maximum Scouring Near the Dike Modelmentioning

confidence: 99%

An Experimental Investigation on Dike Stabilization against Floods

Iqbal,

Tanaka

2023

Geosciences

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A flood protection dike blends seamlessly with natural surroundings. These dikes stand as vital shields, mitigating the catastrophic effects of floods and preserving both communities and ecosystems. Their design not only aids in controlling water flow but also ensures minimal disruption to the local environment and its biodiversity. The present study used a uniform cohesionless sand with d50 = 0.9 mm to investigate the local scour process near a single combined dike (permeable and impermeable), replicating a flooding scenario. The experiments revealed that the maximum scour depth is likely to occur at the upstream edge of the dike, resembling a local scour observed around a scaled-down emerged dike in an open channel. The scour hole downstream of the dike gets shallower as it gets smaller, as do the horseshoe vortices that surround it. Additionally, by combining different pile shapes, the flow surrounding the dike was changed to reduce horseshoe vortices, resulting in scour length and depth reductions of 48% at the nose and 45% and 65% at the upstream and downstream dike–wall junction, respectively. Contrarily, the deposition height downstream of the dike had a reciprocal effect on permeability, which can severely harm the riverbank defense system. The combined dike demonstrates their ability to mitigate scour by reducing the flow swirls formed around the dike. The suggested solutions can slow down the rapid deterioration and shield the dike and other river training infrastructure from scour-caused failures.

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Section: Maximum Scouring Near the Dike Modelmentioning

confidence: 99%

An Experimental Investigation on Dike Stabilization against Floods

Iqbal,

Tanaka

2023

Geosciences

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“…Moreover, vortices generated in the streamwise and spanwise directions were larger near the channel bed compared to the free water surface. The flow characteristics around permeable dike with different staggered pore angles [12] and making a combination of circular cylinders with impermeable dike [13] were investigated using FLUENT (ANSYS). Moreover, FLUENT (ANSYS) was previously also used to investigate flow structure for vegetation [14][15].…”

Section: Introductionmentioning

confidence: 99%

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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Numerical modeling of flow dynamics around L-shaped and T-shaped dikes with varying geometric configurations and wing arrangements

Iqbal,

Tanaka

2024

Model. Earth Syst. Environ.

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Role of Grouped Piles on Flow Characteristics Around Impermeable Spur Dike

Cited by 9 publications

References 39 publications

An Experimental Investigation on Dike Stabilization against Floods

An Experimental Investigation on Dike Stabilization against Floods

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

Numerical modeling of flow dynamics around L-shaped and T-shaped dikes with varying geometric configurations and wing arrangements

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