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<p>Bed stabilization methods and implementing engineering solutions in rivers will help reduce potential damages of sediment transport and soil erosions. This study investigated the scouring of laboratory models for grade-control structures (GCS) with different downstream face angles of 90°, 60°, and 30° and two different soil gradations (<i>d</i><sub>50</sub> = 0.82 and 1.6 mm) under clear water condition. The effects of flow discharge, bed surface gradation, and the densimetric Froude number (Fr<sub>d</sub> = 2.75 to 5.96) for the longitudinal scour hole profile at the equilibrium time (240 min) were investigated. Results indicate that in some cases, an increase in discharge leads to sediment deposition and the formation of anti-dunes rather than intensifying erosion. The average ratio of maximum scour depth with different slopes was investigated. This ratio was calculated as 0.62, 0.77, and 1.24 for angles of 90° to 60°, 90° to 30°, and 60° to 30°, respectively. Additionally, an optimal angle for maximum scour depth was observed within the range of 30° &lt; λ &lt; 60°. Based on experimental data analysis empirical power equations were developed for maximum scour depth and its horizontal distance from the GCS. These equations significantly improved prediction accuracy, reducing the mean absolute percentage error from 15% for logarithmic equation in study of Mossa (1998) to 11.86%.</p>

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Experimental and Analytical Investigation of Scour Morphology Downstream of Broad-Crested Grade-Control Structure

  • 期刊论文

  • 发表日期：

    2026年4月22日

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  • Seyed Mohamad Mahdi Shariati,
  • Mehdi Hamidi,
  • Ali Mahdian Khalili

摘要

Bed stabilization methods and implementing engineering solutions in rivers will help reduce potential damages of sediment transport and soil erosions. This study investigated the scouring of laboratory models for grade-control structures (GCS) with different downstream face angles of 90°, 60°, and 30° and two different soil gradations (d50 = 0.82 and 1.6 mm) under clear water condition. The effects of flow discharge, bed surface gradation, and the densimetric Froude number (Frd = 2.75 to 5.96) for the longitudinal scour hole profile at the equilibrium time (240 min) were investigated. Results indicate that in some cases, an increase in discharge leads to sediment deposition and the formation of anti-dunes rather than intensifying erosion. The average ratio of maximum scour depth with different slopes was investigated. This ratio was calculated as 0.62, 0.77, and 1.24 for angles of 90° to 60°, 90° to 30°, and 60° to 30°, respectively. Additionally, an optimal angle for maximum scour depth was observed within the range of 30° < λ < 60°. Based on experimental data analysis empirical power equations were developed for maximum scour depth and its horizontal distance from the GCS. These equations significantly improved prediction accuracy, reducing the mean absolute percentage error from 15% for logarithmic equation in study of Mossa (1998) to 11.86%.