The effect of the obstacle on the hydraulic response of the composite hydraulic structure

Abstract

Experimental investigations are carried out to study the physics of the flow that passes weir-gate hydraulic structure and encounters obstruction with or without installation of downstream opening. This study approaches the comparison between two different options; the first option deals with free flow condition while the second option deals with submerged flow condition. Various cases are performed considering different hydraulics variables and dimensions variables to evaluate the existence of obstruction with or without openings. Overall the flow pattern is more sensitive to the presence of obstruction at downstream region than in its absence. The hydraulic variables that are considered in the study are divided into dimensional variables such as discharge, downstream flow velocity and water depths at downstream and non-dimensional variables such as discharge coefficient, Froude number and Reynolds number. The obstacles which are used in this study have variable heights with constant width and length. Constant spacing between the obstacles is adopted. Different arrangements of obstacles are considered in this study and it is found that a significant and reasonable result is different among the cases. The effect of rectangular opening in the obstruction on flow pattern is studied. The effect of obstacles with rectangular opening gives a noticeable result in the assessment of the discharge coefficient of the composite hydraulic structure.

Experimental Investigation of Multi Obstacles Impact on Weir-Gate Discharge Structure

“…Table (1) shows the selected dimension of weirgate structure. Figure (1) illustrates the shapes of weir-gate structure and figure (2) illustrates the entire hydraulic system which includes both the weir-gate structure and blocks.…”

“…Table (1) shows the selected dimension of weirgate structure. Figure (1) illustrates the shapes of weir-gate structure and figure (2) illustrates the entire hydraulic system which includes both the weir-gate structure and blocks. In each experiment, the following are measured: upstream water depth, water head above weir sharp crest, actual discharge and water depth at flume downstream.…”

“…The investigation concentrated on the hydraulic and dimensional characteristics separately in order to assess the presence of the obstacle with and without an opening. From the results obtained, it is found that the obstacle with an opening produces a significant effect on the obtained value of composite hydraulic structure discharge coefficient [1]. In this research, an experimental work was carried out by Ibrahim (2017) to reveal the shapes of block influences on the flow pattern at the downstream of a radial wall.…”

An Investigating of the Impact of Bed Flume Discordance on the Weir-Gate Hydraulic Structure

“…Several hydraulic parameters which dominate the discharge structure are also being studied. [15] tried to carry out many experiments in order to investigate the impact of the submerged obstacles with the opening and without the opening on the hydraulic response of the weir-gate structure. From the results, it is found that the obstacles have a major impact on the flow pattern of the discharge structure.…”

“…In this connection, various hydraulics variables and dimensions variables are considered in the study. [16] tried to conduct many experiments to reveal the impact of the submerged barriers on the hydraulic response of the combined weir-gate hydraulic structure. From the results, it is found that the barriers have a major influence on the hydraulic variables of the discharge structure.…”