Abstract
This study is an experimental study to analyze the dissipation effect of a baffle shape installed to reduce the scour problem downstream of a weir. The hydraulic experiment on the flow dissipation effect created by baffle installation was an experiment under a fixed bed condition to investigate the flow dissipation effect based on changes in flow in the apron downstream caused by changes in baffle shape. The experimental analysis was conducted by measuring the flow rate at the apron downstream with and without the installation of a baffle on the basis of the flow dissipation effect. This experiment compared the flow dissipation effect achieved with five baffle shapes to analyze the effect of the baffle shape. Two conditions of flow rate were considered: when a water level in the area of super-critical flow was lower than the baffle height, and when it flowed over the baffle. Overall, the flow dissipation effect was found to be good when a square baffle with a large flow blocking area was used. The analysis also found that hydraulic jump was facilitated when the front part of the baffle was inclined, as flow was induced to the upper direction. The result of the experiment showed that when performing flow dissipation through the use of a baffle, the effect of flow blocking and flow duration alteration should be considered.
Highlights
A weir structure is established to enable water use and flood control, and consists of the main weir body wall and downstream apron
This study aims to analyze the effect of flow dissipation due to various baffle shapes for flow control in the weir downstream
Flow in the weir downstream without baffle installation maintained a super-critical flow where a hydraulic jump did not occur within the experiment area
Summary
A weir structure is established to enable water use and flood control, and consists of the main weir body wall and downstream apron. In the RDC weirs were specified as small-sized structures whose height was up to 2 m to 3 m, which do not apply a flow dissipation structure against downstream flow. Heights of the installed weir structures are 5 m or higher, requiring flow dissipation to stabilize a riverbed in the downstream, such as through dam structures. No downstream flow dissipation techniques have been applied to the design due to a lack of design criteria. Problems of flood control and stability during weir operation have been reported in relation to the occurrence of scour in the upstream and downstream of the weir structure, decision making regarding the size of riverbed protection work, and maintenance after project completion
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