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Corresponding Author

Rashed, Rania

Subject Area

Civil and Environmental Engineering

Article Type

Original Study

Abstract

The purpose of this research is to examine the effect of using hollow semi-circular baffles, on scour hole dimensions downstream hydraulic heading-up structures. Different flow conditions and various geometrical parameters are considered. Fifty-four experiments are carried out under live bed scour conditions. The experiments consist of six sets, each one forced to the same flow conditions, but represents a different suggested geometrical arrangement of the baffles. Results showed that the best position of the baffle is located at the first one- third of the floor length with relative diameter equals to 0.74 to the initial water depth (gate opening). This position causes reduction equal to about 50% for the maximum depth of scour, with respective to the case of flat floor (no baffles). While the extended length of the scour is reduced to about 31%. On the other hand, the second baffles position, at the two-thirds of the floor length reduces only the relative scour length to about 57%. Based on the experimental results, empirical dimensionless relationships are developed for both maximum scour length and depth

Keywords

Circular Baffles; Local Scour; Hydraulic structures; experimental work

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