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<p>The occurrence of large scour holes around bridge piers, especially during floods, is the most important factor leading to the destruction of bridges. Scour hole dimensions are affected by flow conditions, bed sediment, geometry, and arrangement of the pier group. Although bridge failures have occurred during floods, i.e. unsteady flow, most of the studies in the current literature on scour formed around the pier group have been carried out under steady flow. Thus, the present study evaluated the amount of scour and its temporal variations in double bridge piers with skew angles of zero, 15°, 30°, 45°, 60°, 75°, and 90° relative to the flow direction under unsteady flow. In this study, 4 Gaussian distribution hydrographs and duration times of 10, 45, 80, and 120&#xa0;min were used to simulate unsteady flows. The findings demonstrated that with an increase in the angle from 0° to 90°, the changes in the highest scour depth measured at the front pier were small, but the highest scour depth measured at the rear pier increased and reached its highest value at an angle of 45°. In general, for the skew angles of 0°, 15°, and 30°, the scour depth at the front pier was larger than what was measured in the rear pier but it was reversed at angles of 45° and 60°. The results also revealed that the trend of scour depth temporal changes is not influenced by the skew angle of the pier group, but it is affected by the duration time of the hydrograph. An equation was developed enabling the river engineers and environmental managers to accurately estimate the scour depth temporal changes for different hydrograph duration times and different skew angles of the pier group. </p>

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An Experimental Investigation of the Scour Close to Twin Bridge Piers Under Unsteady Flow

  • 期刊论文

  • 发表日期：

    2025年6月10日

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  • Leila Hashemi,
  • Seyed Mahmood Kashefipour,
  • Mehdi Ghomeshi,
  • Mohammad Bahrami Yarahmadi

摘要

The occurrence of large scour holes around bridge piers, especially during floods, is the most important factor leading to the destruction of bridges. Scour hole dimensions are affected by flow conditions, bed sediment, geometry, and arrangement of the pier group. Although bridge failures have occurred during floods, i.e. unsteady flow, most of the studies in the current literature on scour formed around the pier group have been carried out under steady flow. Thus, the present study evaluated the amount of scour and its temporal variations in double bridge piers with skew angles of zero, 15°, 30°, 45°, 60°, 75°, and 90° relative to the flow direction under unsteady flow. In this study, 4 Gaussian distribution hydrographs and duration times of 10, 45, 80, and 120 min were used to simulate unsteady flows. The findings demonstrated that with an increase in the angle from 0° to 90°, the changes in the highest scour depth measured at the front pier were small, but the highest scour depth measured at the rear pier increased and reached its highest value at an angle of 45°. In general, for the skew angles of 0°, 15°, and 30°, the scour depth at the front pier was larger than what was measured in the rear pier but it was reversed at angles of 45° and 60°. The results also revealed that the trend of scour depth temporal changes is not influenced by the skew angle of the pier group, but it is affected by the duration time of the hydrograph. An equation was developed enabling the river engineers and environmental managers to accurately estimate the scour depth temporal changes for different hydrograph duration times and different skew angles of the pier group.