Experimental investigation of gabion inclined drops as a sustainable solution for hydraulic energy loss

Daneshfaraz, Rasoul; Bagherzadeh, Mohammad; Ghaderi, Amir; Francesco, Silvia Di; Asl, Mahdi Majedi

doi:10.1016/j.asej.2021.03.013

Cited by 16 publications

(4 citation statements)

References 26 publications

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“…Re is removed from the equation because the viscosity effects are significantly less in turbulent flow (turbulent flow with Re > 25,000) [25]. To avoid the influence of surface tension on the head-discharge relationship of PKWs, Pfister et al [26], Daneshfaraz et al [27], and Erpicum et al [28] expressly recommended h ≥ 0.03 m. The above recommendations were satisfied in the current study, and so, surface tension was neglected. Additionally, the Froude number was less than 1 in all models, satisfying the subcritical flow conditions at the weir upstream.…”

Section: Dimensional Analysismentioning

confidence: 66%

Laboratory Study of the Hydraulic Performance of the A-Type Triangular Piano Key Weir

Alizadeh Sanami,

Ghaderi,

Alizadeh Sanami

et al. 2023

Water

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A piano key weir (PKW), a new type of weir aiming to increase the discharge capacity of an existing dam, was recently designed. Despite a large body of research in this field, only a few studies were conducted on A-type triangular piano key weirs (TPKW) in straight channels. In this context, this present research sought to study the flow regime, stage–discharge relationship, and discharge coefficient. Experiments were carried out using nine TPKW models and three linear weirs (LW) as the control weirs. The results indicated that the triangular piano key weirs are capable of passing a higher discharge in similar laboratory conditions compared to linear key weirs due to their longer length. For a given h/P ratio (h is the water head over the weir crest, and P is the weir height) and constant length (Le), an increase in the weir height from 0.07 m to 0.15 m decreases the discharge coefficient by approximately 20%. From sensitivity analysis, the most influential parameters for the tested TPKW models are the h/Le dimensionless ratio, followed by the P/Le and Fr. Moreover, the discharge coefficient has a reverse trend when the dimensionless parameters h/P, h/Le, and Froude number are increased. However, with decreasing h/Le, the discharge coefficient of TPKW tends to that of a broad-crested weir because of local submergence. It is expected that the results obtained will be a reference for researchers who work in this field.

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Section: Dimensional Analysismentioning

confidence: 66%

Laboratory Study of the Hydraulic Performance of the A-Type Triangular Piano Key Weir

Alizadeh Sanami,

Ghaderi,

Alizadeh Sanami

et al. 2023

Water

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“…relative height of roughness (h/d 1 ) and slope of the channel (θ). From literature [34][35][36][37] it is observed that the influence of Reynolds number is less on hydraulic jump characteristics and also observed that Reynolds number effect in comparison to other parameters is very less. So, its effect can be ignored.…”

Section: ( ) ( ) P P P P P P P P Pmentioning

confidence: 98%

Experimental investigation of hydraulic jump characteristics in sloping rough surfaces for sustainable development

Gupta,

Dwivedi

2024

Eng. Res. Express

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Understanding the intricate dynamics of hydraulic jumps in sloped channels holds pivotal importance in various engineering applications. This research explores the intricate relationship between the size of the bed material and the basic properties of hydraulic jumps, providing insight into the relative jump length, height, and energy efficiency. The goal of the research is to get important knowledge that will be useful for optimizing hydraulic systems and enhancing their overall efficiency in diverse engineering domains. This study used an open-channel flow arrangement with four-bed slopes (0° to 6°) and three irregularity heights (10 to 30 mm). During the investigation, the Froude number differed from 2.30 to 8.85 and the Reynolds number differed from 5450 to 25500. A novel instinctive technique was used to create correlations for different hydraulic jump characteristics in roughen-bed inclined channels. The study examines the combined effects of roughness and slope of the bed, and it was discovered that the relative jump height and efficiency of hydraulic jump increase by 19.37% and 8.44% respectively while the relative jump length decreases by 23.05% with an increase in bed slope from 0° to 6°. The relative jump height and efficiency of the hydraulic jump increase by 14.20% and 21.06% respectively while the relative jump length decreases by 29.09% with a rise in bed roughness from 0 to 30 mm.

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“…Grid dissipators are located in the path of a supercritical flow; they deposit the flow onto the downstream steps. By this process, they dissipate the destructive flows [2,3].…”

Section: Introductionmentioning

confidence: 99%

Three-Dimensional Investigation of Hydraulic Properties of Vertical Drop in the Presence of Step and Grid Dissipators

et al. 2021

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In irrigation and drainage channels, vertical drops are generally used to transfer water from a higher elevation to a lower level. Downstream of these structures, measures are taken to prevent the destruction of the channel bed by the flow and reduce its destructive kinetic energy. In this study, the effect of use steps and grid dissipators on hydraulic characteristics regarding flow pattern, relative downstream depth, relative pool depth, and energy dissipation of a vertical drop was investigated by numerical simulation following the symmetry law. Two relative step heights and two grid dissipator cell sizes were used. The hydraulic model describes fully coupled three-dimensional flow with axial symmetry. For the simulation, critical depths ranging from 0.24 to 0.5 were considered. Values of low relative depth obtained from the numerical results are in satisfactory agreement with the laboratory data. The simultaneous use of step and grid dissipators increases the relative energy dissipation compared to a simple vertical drop and a vertical drop equipped with steps. By using the grid dissipators and the steps downstream of the vertical drop, the relative pool depth increases. Changing the pore size of the grid dissipators does not affect the relative depth of the pool. The simultaneous use of steps and grid dissipators reduces the downstream Froude number of the vertical drop from 3.83–5.20 to 1.46–2.00.

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Experimental investigation of gabion inclined drops as a sustainable solution for hydraulic energy loss

Cited by 16 publications

References 26 publications

Laboratory Study of the Hydraulic Performance of the A-Type Triangular Piano Key Weir

Laboratory Study of the Hydraulic Performance of the A-Type Triangular Piano Key Weir

Experimental investigation of hydraulic jump characteristics in sloping rough surfaces for sustainable development

Three-Dimensional Investigation of Hydraulic Properties of Vertical Drop in the Presence of Step and Grid Dissipators

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