Experimental Study of Composite Inclined Weir – Gate Hydraulic Structure

Qasim, Rafi M.; Abdulhussein, Ihsan A.; Al-Asadi, Khalid

doi:10.37394/232013.2020.15.5

Cited by 7 publications

(3 citation statements)

References 9 publications

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“…The volume method is used to measure the actual discharge while a scale point gauge is used to measure the water depth. Weir -gate device (hydraulic structure) models are manufactured from wood sheet with thickness 5 mm beveled along all the edges at (45°) and with sharp edges of thickness (1 mm) [13]. The baffles are manufactured by wood with 5 mm thickness.…”

Section: Engineeringmentioning

confidence: 99%

Analysis of the hydraulic interference between the baffles and the composite hydraulic structure

Qasim,

Abdulhussein,

Hameed

2023

Eureka: PE

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The purpose of the present study is to examine the influence of baffles presence at downstream system on weir gate hydraulic response. Two baffles configuration (triangle and angle shapes) are installed in bed flume. Two different spacing are used between the baffles and two different directions for baffles are also adopted. The study tries to investigate the variation in upstream Froude number, downstream Froude number, Reynolds number, actual discharge, discharge coefficient, downstream average water depth and the hydraulic system efficiency which is expressed as function of downstream water depth. It has been shown that the number of baffles has a direct and significant impact on flow hydraulic characteristics of weir-gate structure regardless of the spacing between baffles and the direction of baffles related to flow. Baffles number and spacing have essential impact on the water flow velocity of system and this impact leads to increase the flow resistance. The results clarify that the upstream Froude number, downstream Froude number, Reynolds number, actual discharge and discharge coefficient are decreased with the increase in baffles number except the average downstream water depth which increases with increase in baffles number. The efficiency of hydraulic system gives a good indicator for using baffles with weir-gate structure. At the end this paper shows a fruitful result of efficiency. This experiment run condense on the baffle’s numbers and directions with respect to the water flow direction at the downstream regime. So, the rises in the water level relies on the numbers and directions of the baffles as compare to the case without using baffles at the flume downstream region. The actual discharge and weir-gate discharge coefficient are more sensitive to the increase in the baffles’ numbers and the baffles direction with respect to the water flow direction

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Section: Engineeringmentioning

confidence: 99%

Analysis of the hydraulic interference between the baffles and the composite hydraulic structure

Qasim,

Abdulhussein,

Hameed

2023

Eureka: PE

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“…From the results they found that the obstacles have a major impact on the hydraulic characteristics of the discharge structure like actual discharge, discharge coefficient, downstream water flow velocity, and downstream water depth. Qasim et al [4] did some experiments to assess the role of the combined discharge structure inclination angle in the alteration of the hydraulic structure characteristics. The inclination angle refers to the angle between the combined hydraulic structure and the horizontal bed of the flume.…”

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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“…Several researchers have dealt with the issue of the weir-gate hydraulic structure. Qasim et al [1] did an experimental study to assess the influence of weir-gate hydraulic structure inclination angle, the study adopted angle range from 45 degrees to 135 degrees with the horizontal bed of the flume and compared the result with the case when the inclination angle equal to 90 degrees. The investigations include the impact of the inclination angle on the actual flow rate, discharge coefficient, water depth at the downstream region of the flume, and cross-sectional area of flow which crosses the gate and weir respectively.…”

Section: Introductionmentioning

confidence: 99%

Hydraulic Behavior of Weir-Gate Structure with Rectangular Side Obstacle under Free and Submerged Flow Conditions

Qasim,

Dawood

2023

I2M

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This research examines the behavior of a weir-gate hydraulic structure when subjected to the presence or absence of a side obstacle. The study focuses on two scenarios, free flow and submerged flow, and employs a side obstacle with dimensions of 15 cm in height, 30 cm in length, and 1 cm in thickness, located 30 cm downstream from the weir-gate structure. A correlation matrix is derived using measured and calculated data to establish the relationship between various variables, both dimensional and non-dimensional. The results show a clear correlation between Froude number and discharge coefficient, while a random trend is observed between discharge coefficient and Reynolds number. A proper trend is found between Reynolds number and Froude number at the downstream location. The discharge coefficient is significantly influenced by factors such as gate water depth, weir water head, and vertical distance between the weir and gate. Additionally, the study investigates the effect of average water depth at the downstream on discharge and flow velocity. Two models, linear regression and artificial neural network, are developed and tested to estimate the coefficient of discharge (Cd). The ANN model proves to be the best-fit model for all scenarios, with an MSE of 0.00013141 and an R-squared value of 0.99. The machine learning algorithms used in this study demonstrate an increase in prediction accuracy for Cd.

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Experimental Study of Composite Inclined Weir – Gate Hydraulic Structure

Cited by 7 publications

References 9 publications

Analysis of the hydraulic interference between the baffles and the composite hydraulic structure

Analysis of the hydraulic interference between the baffles and the composite hydraulic structure

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

Hydraulic Behavior of Weir-Gate Structure with Rectangular Side Obstacle under Free and Submerged Flow Conditions

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