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<p>To address the reduction in effectiveness of conventional collars around bridge piers as the scour hole develops, this study proposes a terrain-adaptive collar consisting of segmented sections connected by spring connectors. The effectiveness of the proposed collar in reducing the maximum local scour depth around a single pier was then investigated through laboratory flume experiments in a curved channel. The effects of segmentation angle and number of segmentation tiers on scour reduction efficiency, which is defined as the reduction rate of the maximum scour depth within the collar coverage area, were examined. The results show that the terrain-adaptive collar could partially settle in response to bed topography changes, achieving scour reduction efficiencies ranging from 60.78 to 74.51%, all of which are higher than the 58.82% efficiency of the conventional collar. The number of segmentation tiers is the dominant factor influencing scour reduction efficiency, exhibiting a significant main effect, whereas neither the segmentation angle nor its interaction with the number of tiers shows a significant effect. Therefore, priority should be given to a higher number of segmentation tiers in collar design. Within the coverage ratio range of 50–100%, the scour reduction efficiency first increases and then decreases with increasing coverage percentage, peaking at 73%, with an optimal coverage range of 69–77%. These findings could provide theoretical foundations and engineering references for local scour protection of bridge piers in a curved river bend.</p>

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An Experimental Study on the Effect of Terrain-Adaptive Collar on Scour Reduction Around a Single Bridge Pier at a River Bend

  • 期刊论文

  • 发表日期：

    2026年7月1日

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  • Hongliang Qi,
  • Yichen Zhang,
  • Bohan Wang,
  • Jiayang Yang,
  • Hongjun Zhou

摘要

To address the reduction in effectiveness of conventional collars around bridge piers as the scour hole develops, this study proposes a terrain-adaptive collar consisting of segmented sections connected by spring connectors. The effectiveness of the proposed collar in reducing the maximum local scour depth around a single pier was then investigated through laboratory flume experiments in a curved channel. The effects of segmentation angle and number of segmentation tiers on scour reduction efficiency, which is defined as the reduction rate of the maximum scour depth within the collar coverage area, were examined. The results show that the terrain-adaptive collar could partially settle in response to bed topography changes, achieving scour reduction efficiencies ranging from 60.78 to 74.51%, all of which are higher than the 58.82% efficiency of the conventional collar. The number of segmentation tiers is the dominant factor influencing scour reduction efficiency, exhibiting a significant main effect, whereas neither the segmentation angle nor its interaction with the number of tiers shows a significant effect. Therefore, priority should be given to a higher number of segmentation tiers in collar design. Within the coverage ratio range of 50–100%, the scour reduction efficiency first increases and then decreases with increasing coverage percentage, peaking at 73%, with an optimal coverage range of 69–77%. These findings could provide theoretical foundations and engineering references for local scour protection of bridge piers in a curved river bend.