Experimental Studies on Flow over Labyrinth Weir

Khode, B. V.; Tembhurkar, A. R.; Porey, P. D.; Ingle, R. N.

doi:10.1061/(asce)ir.1943-4774.0000336

Cited by 32 publications

(5 citation statements)

References 3 publications

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“…Figure 5 shows the discharge coefficient against H t /P for different sidewall angles. Khode et al (2012) investigated the flow characteristics of the labyrinth weirs. Different sidewall angles of 8°to 30°were used, and a chart with several design curves was plotted.…”

Section: Experimental Investigationmentioning

confidence: 99%

A review of hydraulic performance and design methods of labyrinth weirs

Idrees

Al-Ameri

2022

Water Supply

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Labyrinth weirs are complex hydraulic structures. It has been widely used as a water regulator and to increase discharge in channels and spillway dams. The Labyrinth weirs are an economical and effective method to pass large floods. In addition, it is used to reduce the requirements of the structural footprint. These features make it an interesting and appropriate choice to increase the capacity of discharge. Several factors affect the discharge capacity and the hydraulic performance of the labyrinth weirs, including water level to crest height ratio, angle of sidewalls, apex width, conveyance channel conditions, and vertical aspect ratio. However, the present paper aims to summarise the most relevant knowledge of the hydraulic characteristics of the labyrinth weirs in the preceding articles. The importance of the present study is to provide a better understanding of how these weirs operate, in addition to which future studies deserve further investigation. The results demonstrated that some parameters still need further investigation. Also, energy dissipation over the labyrinth weir needs further investigation with different weir geometry. Furthermore, the results showed that common design equations did not take into account all parameters affecting labyrinth weir performance, including geometries, flow conditions, site conditions, and scale effect.

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Section: Experimental Investigationmentioning

confidence: 99%

A review of hydraulic performance and design methods of labyrinth weirs

Idrees

Al-Ameri

2022

Water Supply

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“…Carollo, et al [9] provided a relationship using dimensional analysis for the discharge over a triangular labyrinth weir with a sharp edge crest. Khode, et al [10] provided another family of curves for a wider range of weir sidewall angle, the relationships can be used for designing labyrinth weirs. Bilhan, et al [11] experimentally investigated the discharge capacity of labyrinth weirs with and without nappe breakers.…”

Section: Figure 1 -Labyrinth Weir In a Channel With Converging Wallsmentioning

confidence: 99%

Effect of Different Channels on Discharge Coefficient of Labyrinth Weirs

Daneshfaraz

Ghaderi

Abraham³

et al. 2021

Teknik Dergi

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In this study, the effect of channel-bed slope and non-prismatic converging channel on the discharge coefficient of labyrinth weirs is numerically investigated utilizing FLOW-3D model. Numerical simulation results show that modifying the labyrinth weir channel through both methods improves the discharge coefficient. Among the selected bed slopes and converging channel wall, the slope of β=4% and angle of θ=10° yielded the highest discharge coefficient. For a ratio H T /P=0.1, (H T : flow height, P: weir height) the discharge coefficient and discharge rate for bed slope and convergence angle case were 19.22%, 23.9% and 22.28%, 25.91% higher than for a conventional labyrinth weir in prismatic channel, respectively. Simultaneous application of a bed slope and convergence angle significantly increases the discharge coefficient and discharge value case were 28.64% and 30.42% higher than compared to the conventional case. Therefore, changing the bed slope and wall angle of the weir channel increases the discharge coefficient and in this type of weir and these design alterations should be considered in weir design.

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“…Used as a spillway option for flood discharge and regulation of reservoir water stages, such a weir is superior to traditional gated spillways. Being a cost-effective solution, labyrinth weirs are adopted in many dam projects, both new and existing [16,17]. The labyrinth weir even finds its applications in land drainage and urban sewage systems.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Pool-Type Fish Passage with Labyrinth Weirs

Yang

Ansell

2022

Sustainability

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Due to the construction of dams and sluices, habitat fragmentation of riverine species is an issue of concern in hydropower projects. An artificial fishway aims to restore flow connectivity and facilitate migration. As an alternative to the conventional layout with straight walls, labyrinth layouts are introduced, consisting of either triangular, trapezoidal, or rectangular weirs. Three-dimensional CFD simulations are performed to examine their influences on the fishway hydraulics. The labyrinth layouts exhibit an appreciable three-dimensional flow structure in a pool, featuring flow fluctuations in both cross- and along-channel directions, which is indicative of the potential for multiple species with distinct swimming preferences. The streamwise reduction in mean flow velocity is correlated with the Froude number, with the labyrinth weirs leading to a somewhat lower reduction than the conventional one. The dimensionless pool water depth declines with specific flow discharge. The turbulence kinetic energy is the lowest in the triangular layout and the vorticity in the conventional one. Among the labyrinth layouts, the differences in volumetric power dissipation are small. An equation is developed for dissipation estimation. All the labyrinth layouts generate higher energy loss than the conventional one. With optional weir configurations, the findings provide reference for engineering design.

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Experimental Studies on Flow over Labyrinth Weir

Cited by 32 publications

References 3 publications

A review of hydraulic performance and design methods of labyrinth weirs

A review of hydraulic performance and design methods of labyrinth weirs

Effect of Different Channels on Discharge Coefficient of Labyrinth Weirs

Evaluation of Pool-Type Fish Passage with Labyrinth Weirs

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