Numerical modelling of contracted sharp‐crested weirs and combined weir and gate systems

Altan‐Sakarya, A. Burcu; Kökpinar, Mehmet Ali; Duru, Aysel

doi:10.1002/ird.2468

Cited by 11 publications

(3 citation statements)

References 13 publications

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“…Ahmadabadi and Vatani [14] used five different methods relying on artificial neural networks to assess the weir-gate discharge coefficient. Altan-Sakarys et al [15] studied numerically two different problems: the first dealt with weir, while the second dealt with composite weir-gate. The paper concentrated on the comparison between the numerical investigations of the two different problems with experimental data.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Emerged Dike Influence on Combined Discharge Structures in Open Channel Flow

Qasim,

Abdulhussein,

Naeem

et al. 2024

MMEP

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This paper investigates experimentally the changing of a hydraulic characteristic of combined hydraulic structure owing to the existence of dike structure. Different models of combined structures are used with rectangular gates and rectangular weirs, respectively. Also, the location of the dike structure is considered. A dike is located upstream, downstream, and on both sides of the combined hydraulic structure. Discharge quantity, average downstream water depth, discharge coefficient, and Reynolds number are adopted to describe the alteration in hydraulic behavior of a combined structure. While the relation between upstream Froude number and downstream Froude number, as well as the relation between downstream Froude number with distance, are employed to illustrate the interactive response between dike and combined structure, From the study, the relation between Froude number at downstream and non-dimensional downstream distance as well as the relation between non-dimensional downstream water depth and non-dimensional distance reveal how the dike location effects on water depth and flow velocity, which lead to a change in the type of flow. Here, the dike position is shared in the form of a hydraulic jump at downstream of the combined structure. The experimental data were statistically analyzed to ensure their validity and reliability. The importance of this study is concentrated on how the location of the dike structure is shared in the alteration in the hydraulic characteristics of the combined hydraulic structure, especially the rise in the water depth at downstream, in addition to the change in the hydraulic jump height and energy losses.

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Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Emerged Dike Influence on Combined Discharge Structures in Open Channel Flow

Qasim,

Abdulhussein,

Naeem

et al. 2024

MMEP

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“…Authors in [7] presented a governing equation for calculating the discharge over a triangular, sharp-crested weir. Additionally, several empirical equations were formulated to estimate discharge over various types of weirs [8][9][10]. Authors in [11] estimated the discharge of the inverted V-shaped gate in a combined system composed of a rectangular weir and a triangular gate using the discharge equation derived in [12].…”

Section: Introductionmentioning

confidence: 99%

Discharge Coefficient of a Two-Rectangle Compound Weir combined with a Semicircular Gate beneath it under Various Hydraulic and Geometric Conditions

Alsaydalani

2024

Eng. Technol. Appl. Sci. Res.

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Two-component composite hydraulic structures are commonly employed in irrigation systems. The first component, responsible for managing the overflow, is represented by a weir consisting of two rectangles. The second component, responsible for regulating the underflow, is represented by a semicircular gate. Both components are essential for measuring, directing, and controlling the flow. In this study, we experimentally investigated the flow through a combined two-rectangle sharp-crested weir with a semicircular gate placed across the channel as a control structure. The upper rectangle of the weir has a width of 20 cm, while the lower rectangle has varying widths (W2) of 5, 7, and 9 cm and depths (z) of 6, 9, and 11 cm. Additionally, three different values were considered for the gate diameter (d), namely 8, 12, and 15 cm. These dimensions were tested interchangeably, including a weir without a gate (d = 0), under different water head conditions. The results indicate that the discharge passing through the combined structure of the two rectangles and the gate is significantly affected by the weir and gate dimensions. After analyzing the data, empirical formulas were developed to predict the discharge coefficient (Cd) of the combined structure. It is important to note that the analysis and results presented in this study are limited to the range of data that were tested.

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“…A governing equation to estimate discharge over a triangular sharp-crowned weir was expressed in [6]. Various empirical equations have been presented to estimate discharge in various weir types [7][8][9]. In [10], the discharge equation obtained by [11] was used as a basis to estimate the discharge for the inverted V-shaped gate of a combined system consisting of a rectangular weir and a triangular gate, showing that the combined discharge is significantly affected by the triangle gate.…”

Section: Introductionmentioning

confidence: 99%

Hydraulic Jump Characteristics Downstream of a Compound Weir consisting of Two Rectangles with a below Semicircular Gate

Alsaydalani

2024

Eng. Technol. Appl. Sci. Res.

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Weirs are often used in laboratories, industries, and irrigation channels to measure discharge. The discharge capacity of a structure is vital for its safety and plays an important role in the combined gate-weir flow, which is a complicated phenomenon in hydropower. This study carried out experiments on a combined hydraulic structure, which included a compound sharp-crested weir made up of two rectangles along with an inverted semicircular sharp gate. Installed on a straight channel, this structure served as a control instrument. The study aimed to investigate the downstream hydraulic jump characteristics of this combined structure, specifically, the sequent depth ratio (y2/y1), the hydraulic jump height ratio (Hj/y1), the energy loss ratio through the jump (EL/Eu), and the jump length ratio (Lj/y1). The width of the upper rectangle on the weir was set at 20 cm. The width of the lower rectangle (W2) was set at 5, 7, and 9 cm, while its depths (z) were fixed at 6, 9, and 11 cm. The gate's diameters varied between 8, 12, and 15 cm. These measurements were alternated with varying initial Froude numbers (Fn1) ranging between 1.32 and 1.5. The results showed that the dimensions of both the weir and the gate influenced the hydraulic jump characteristics. Empirical formulas were developed to predict y2/y1, Hj/y1, EL/Eu, and Lj/y1 based on the differing dimensions of the combined structure. The findings and analysis of this study are limited to the range of data that were tested.

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Numerical modelling of contracted sharp‐crested weirs and combined weir and gate systems

Cited by 11 publications

References 13 publications

Experimental Investigation of Emerged Dike Influence on Combined Discharge Structures in Open Channel Flow

Experimental Investigation of Emerged Dike Influence on Combined Discharge Structures in Open Channel Flow

Discharge Coefficient of a Two-Rectangle Compound Weir combined with a Semicircular Gate beneath it under Various Hydraulic and Geometric Conditions

Hydraulic Jump Characteristics Downstream of a Compound Weir consisting of Two Rectangles with a below Semicircular Gate

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