The simultaneous use of cable and bed sill (CBS) scour countermeasures around a cylindrical pier was investigated. With the aim of finding the best combination of CBS in terms of scour depth reduction, 16 laboratory assessments of local scour were conducted. These experiments were also used to investigate the turbulent flow structure and sediment entrainment. The best combination of simultaneous CBS reduced the scour depth by about 34%. The flow structures around an unprotected pier (reference case) and for the best CBS configuration were compared by employing turbulent analysis methods. Two-dimensional bursting events were used to understand the stochastic nature of the flow structure around the pier. The turbulence characteristics and occurrence probabilities of bursting events confirmed the effect of the combination of CBS on reducing the scour depth. In addition, of all the bursting events, ejection events were found to have the highest transition probabilities.

中文翻译：

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圆柱形桥墩周围同时使用缆索和底坎冲刷对策的效果

研究了在圆柱形桥墩周围同时使用缆索和底梁 (CBS) 冲刷对策。为了找到减少冲刷深度方面 CBS 的最佳组合，对当地冲刷进行了 16 次实验室评估。这些实验还用于研究湍流结构和沉积物夹带。同步 CBS 的最佳组合可减少约 34% 的冲刷深度。采用湍流分析方法对未受保护的桥墩（参考案例）周围的流动结构和最佳 CBS 配置进行了比较。二维爆破事件用于了解码头周围流动结构的随机性质。湍流特征和爆破事件的发生概率证实了CBS组合对降低冲刷深度的效果。此外，在所有爆炸事件中，喷射事件被发现具有最高的转变概率。