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<p>With the rapid expansion of bridge infrastructure, local scour around bridge piers has become a critical threat to foundation stability. This study proposes a novel combined scour countermeasure integrating spindle-shaped flow deflectors with protective collars to enhance pier stability against scouring. The performance of the proposed system was evaluated under clear-water conditions using computational fluid dynamics simulations with the large eddy simulation (LES) model. Results demonstrate that the LES model accurately predicts scour depth, outperforming the RNG <i>k-ε</i> model. Although the LES model requires a higher computational time for scour evolution prediction, it provides significantly higher accuracy in simulating flow characteristics around piers, making it a more reliable tool for investigating the hydrodynamic mechanism of novel scour protection structures. Individually, the spindle-shaped structure reduces scour depth by 16.8–43.2% during the early stages of scouring, while the collar achieves a 32.4% reduction at the late stage. When combined, the system yields scour depth reductions of 35.1–59.6%, indicating significant synergistic effects. The proposed combined structure offers a promising and efficient solution for bridge pier scour protection.</p>

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Scour protection at bridge piers: a combined system of spindle-shaped structures and collars

  • 期刊论文

  • 发表日期：

    2026年6月14日

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  • Yilin Yang,
  • Renjun Wang,
  • Jinzhao Li,
  • Haiquan Jing,
  • Pengru Deng

摘要

With the rapid expansion of bridge infrastructure, local scour around bridge piers has become a critical threat to foundation stability. This study proposes a novel combined scour countermeasure integrating spindle-shaped flow deflectors with protective collars to enhance pier stability against scouring. The performance of the proposed system was evaluated under clear-water conditions using computational fluid dynamics simulations with the large eddy simulation (LES) model. Results demonstrate that the LES model accurately predicts scour depth, outperforming the RNG k-ε model. Although the LES model requires a higher computational time for scour evolution prediction, it provides significantly higher accuracy in simulating flow characteristics around piers, making it a more reliable tool for investigating the hydrodynamic mechanism of novel scour protection structures. Individually, the spindle-shaped structure reduces scour depth by 16.8–43.2% during the early stages of scouring, while the collar achieves a 32.4% reduction at the late stage. When combined, the system yields scour depth reductions of 35.1–59.6%, indicating significant synergistic effects. The proposed combined structure offers a promising and efficient solution for bridge pier scour protection.