Using Physical and Soft Computing Models to Evaluate Discharge Coefficient for Combined Weir–Gate Structures Under Free Flow Conditions

Balouchi, Behnam; Rakhshandehroo, Gholamreza

doi:10.1007/s40996-018-0117-0

Cited by 15 publications

(3 citation statements)

References 33 publications

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“…Several variables are used in studies of scour depth in the riverbed [4,11,16,20,21]. The scour depth depends on a large number of flow and basin variables (geometric, kinematic, and dynamic variables) as follows.…”

Section: Methodsmentioning

confidence: 99%

Effect of Various Kinds of Stilling Basin’s Baffle Blocks Arrangement on River Bed Scour

Abdelkader

2022

IJESNR

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The management of water retaining structures and their environmental impacts are critical aspects of hydraulic engineering studies. From an environmental perspective, hydraulic structure planning is primarily concerned with the design of the water-releasing sections (outlet) of the water retaining structures. It is essential that such structures are properly designed in order to meet the requirements of sustainability of the surrounding ecological system. This study aims to examine the impact of hydraulic jump stilling basin length and energy dissipation blocks on scour depth and reach an optimum performance of the stilling basin. To this end, an experimental study was conducted to investigate the effect of the stilling basin's baffle blocks on the river bed scour downstream of a water-retaining structure. Several hydraulic parameters were incorporated in the analysis and design of the stilling basin. The study introduces a novel approach to estimating the maximum scour based on a non-linear regression model.

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Section: Methodsmentioning

confidence: 99%

Effect of Various Kinds of Stilling Basin’s Baffle Blocks Arrangement on River Bed Scour

Abdelkader

2022

IJESNR

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“…Authors in [22] studied the combined flow over sharply crested weirs and beneath gates. Authors in [23] conducted experiments on a combined triangular weir and rectangular gate structure to determine its discharge coefficient. Authors in [24] carried out experimental runs on a compound weir consisting of two rectangles separated by sloping sides, along with a circular gate beneath it.…”

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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“…In [21], the combined flow below gates and over sharply crowned weirs was investigated. In [22], a combination of the triangular weir and the rectangular gate structure was used to assess the discharge coefficient. In [23][24], the hydraulic properties of weirs and combined weirs were explored according to the following scenarios: rectangular, V-notch, semicircular, rectangular combined weir with a rectangular gate, V-notch combined weir with a rectangular gate, semicircular combined weir with a rectangular gate, and semicircular combined weir with a semicircular 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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Using Physical and Soft Computing Models to Evaluate Discharge Coefficient for Combined Weir–Gate Structures Under Free Flow Conditions

Cited by 15 publications

References 33 publications

Effect of Various Kinds of Stilling Basin’s Baffle Blocks Arrangement on River Bed Scour

Effect of Various Kinds of Stilling Basin’s Baffle Blocks Arrangement on River Bed Scour

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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