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Subject Area

Civil and Environmental Engineering

Article Type

Original Study

Abstract

The occurrence of local scour downstream of heading-up structures poses a significant threat to their safety and stability, leading to complete failure. In this study, a series of ninety-six experiments were conducted in a rectangular flume downstream of a Fayoum-type weir. The experiments were designed to investigate the effects of various flow conditions, including a wide range of Froude numbers and tailwater depths. Three different applied discharges of 17.29, 20.63, and 24.17 lit/sec were utilized, along with twelve values of the Froude number ranging from 0.19 to 0.39. The experimental runs were divided into three distinct groups. The first group comprised twelve runs conducted on a flat floor without any energy dissipation devices. The second group consisted of forty-eight runs on a flat floor that ended with a sill. The third group encompassed thirty-six runs on a flat floor with rasp heads, examining the effectiveness of an equivalent height to the most effective height of the end sill in reducing scour. The rasp heads were positioned in three different locations. The results of the experiments revealed that the best height of the end sill was 0.05 where, it reduced scour parameters by percentages 37.5% to 83% for scour depth and from 3.48% to 43.48% for scour length. The best position for the rasp heads was at the first one-third of the floor length. In this position, the scour depth and length were reduced with percentages 55.28% to 96.43% and from 44.44% to 85.7%, respectively, compared to scour depth on a flat floor.

Keywords

Heading-up structures, End sill, Rasp heads, Local scour, Froude number

Creative Commons License

Creative Commons Attribution 4.0 License
This work is licensed under a Creative Commons Attribution 4.0 License.

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