Local Scour Around T-Shape Submerged Groynes in Clearwater Conditions

Rashak, Budoor Mohammed

doi:10.21660/2021.77.98264

Cited by 3 publications

(3 citation statements)

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“…The extent of the scour region is greater on the downstream side compared to the upstream, but the volume of the upstream scour hole is about 65% of the total volume. They indicate that Froude number is a significant parameter in scour depth around the groyne, and other parameters play secondary role, which was later also confirmed by Rashak and Khassaf [126]. Giglou et al [131] conducted an analysis of flow pattern around spur dikes by a 3D numerical model, and showed that vortex length behind the spur dike is four times longer than the length of spur dike, and with approximately 1.2 times the spur dike length.…”

Section: Similar Structures Analogymentioning

confidence: 78%

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Scour at Bridge Piers Protected by the Riprap Sloping Structure: A Review

Harasti

Gilja

Potočki

et al. 2021

Water

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Bridge piers on large rivers are often protected from scouring using launchable stone, such as a riprap sloping structure. While such scour countermeasures are effective for pier protection, they significantly alter flow conditions in the bridge opening by overtopping flow and flow contraction, deflecting the formation of the scour hole downstream and exposing the downstream riverbed to additional scour. This paper provides a comprehensive and relevant review of bridge scour estimation methods for piers with a riprap sloping structure installed as a scour countermeasure. Research on empirical methods for bridge scour estimation is reviewed and analyzed with formulae used for comparable structures—complex pier formulae and formulae for river training structures. A summary of relevant formulae applicable to piers with installed scour countermeasures is provided, as well as a discussion on the possible future research directions that could contribute to the field.

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Section: Similar Structures Analogymentioning

confidence: 78%

“…Another formula developed by Rashak and Khassaf [126] in clear-water conditions for T-shape submerged groynes is as follows:…”

Section: Similar Structures Analogymentioning

confidence: 99%

Scour at Bridge Piers Protected by the Riprap Sloping Structure: A Review

Harasti

Gilja

Potočki

et al. 2021

Water

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“…Sci., 32 (1), 69-86. DOI 10.22630/ srees.4506 for many purposes, such as: directing the flow for the chosen reach, increasing the flow depth for navigation, preventing erosion of rivers banks, establishing river alignment and cross-section, enhancing habitats of riverine aquatic, altering the surrounding view and aiding the accessibility to the river (Jafari & Masjedi, 2015;Rashad, 2021). Spur-dikes are typically made from stone, gravel, rock, earth, sand, or piles.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation for the local scour around V-shaped spur-dikes

ALASADI

Khlif

Hassan

2023

srees

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Spur-dikes are efficient hydraulic structures that are made for numerous purposes. They have one end on the stream bank and another extending into the current. As a result of the existing spur-dikes in the stream course, the local scour phenomena usually occur around them, leading to several predicaments which have been of great concern to the hydraulic engineers. For the present work, laboratory experiments were carried out to measure the scour depths around several spur-dikes located at different distances for the V-shaped one. The experiments were conducted using physical models installed in a non-curved flume with a bed with uniform cohesion-less sediment of a medium particle size (d50 = 0.7 mm). All the models were operated under the subcritical flow of clear-water conditions. The investigations include three spur-dikes (1, 2 and 3) and three distances between them (1, 1.5 and 2 of spur-dike length) as two countermeasures to minimize the local scour depths. The results showed that an increasing number of spur-dikes and the distances between them would decrease the scour depths within the limit of the present study. The experimental data were used to create a new formula of R2 = 0.954 that reflects a good agreement with the experimentally observed results.

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Evaluating the Hydraulic Performance of USBR II Stilling Basin with Rough Bed

Saleh,

Khassaf

2024

Tikrit j. eng. sci.

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Stilling basins are built in conjunction with dams, weirs, and gates to dissipate the high kinetic energy of incoming flow and prevent severe scouring of the downstream riverbed. Dissipation of this high energy can be achieved through forming a hydraulic jump. The hydraulic jump features, including the relative length, ratio of sequent depth, and energy dissipation, are utilized as criteria to evaluate the efficiency of the stilling basin operation. The present study involved conducting experimental and numerical tests to evaluate the performance of the USBR II stilling basin downstream of an ogee spillway using six upstream Froude numbers ranging between 6.37 and 14.97. Experiments were conducted for the Typified USBR II stilling basin. The results were used to perform mesh sensitivity for numerical simulation. The USBRII stilling basin with different rough beds was numerically simulated using FLOW-3D software. The rough beds were designed using three roughness intensities, 10%, 15%, and 22%, and three relative roughness heights: 1, 0.75. and 1. According to the numerical results, distributing staggered cubic elements in the bed of the USBR II stilling basin at 10% intensity and a relative roughness height of (1) enhanced the stilling basin performance compared to the smooth bed and other rough beds. In the case of the best roughness bed, the sequent depth ratio decreased by about 12.1%, and the energy dissipation enhanced by around 5.1% compared to the Typified basin.

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Local Scour Around T-Shape Submerged Groynes in Clearwater Conditions

Cited by 3 publications

References 0 publications

Scour at Bridge Piers Protected by the Riprap Sloping Structure: A Review

Scour at Bridge Piers Protected by the Riprap Sloping Structure: A Review

Experimental investigation for the local scour around V-shaped spur-dikes

Evaluating the Hydraulic Performance of USBR II Stilling Basin with Rough Bed

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