潜堤在越堤流作用下会加剧局部冲刷，对工程安全造成重大影响。采用FLOW3D数值模拟手段，设置多种试验工况，分析越堤流作用下潜堤周边冲刷规律，为合理确定潜堤的护底范围提供依据。结果表明：跌水作用是导致冲刷坑发育的主要成因；最大冲刷深度与水深与堤高比值呈负相关，与堤前水流流速呈正相关，两者皆显著影响冲刷深度；潜堤顶宽10 m为最大冲刷深度变化拐点，顶宽大于15 m后最大冲刷深度缓慢增长。

英文摘要:

Overbank flow can intensify local scour around submerged embankments, posing significant risks to engineering safety. In this study, FLOW3D numerical simulations were conducted under multiple test conditions to analyze the scour patterns around submerged embankments subjected to overbank flow, providing a basis for determining appropriate bottom protection extents. The results indicate that the falling water effect is the primary cause of scour pit development. The ratio of water depth to embankment height is negatively correlated with maximum scour depth, while the approach flow velocity is positively correlated—both factors significantly influence scour depth. A top width of 10 m marks an inflection point in the variation of maximum scour depth, which increases only gradually when the top width exceeds 15 m.

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