Refinement of numerical model on flows and bed deformation around river hydraulic structure and its verification

在丁坝、方柱等河流水工建筑物周围，复杂的三维水流结构占主导地位。因此，简单的平均水深模型不适用于这种情况。本文从理论上对三维水流结构进行了模拟，并考虑了二次流、水流加减速和垂向加速度的影响，建立了深度平均水流模型。并进行了三维数值模拟，对数值结果进行了比较。研究了采用平衡和非平衡输沙模型的数值模型对丁坝和河道局部冲刷的适用性。

Around river hydraulic structures such as a spur dike and a square cylinder, complex three-dimensional flow structures are predominant. Therefore, a simple depth averaged flow model is not applicable to such cases. In this study, a modeling of three-dimensional flow structures is carried out theoretically, and a depth averaged flow model is refined by incorporating the effects of secondary currents, flow acceleration/deceleration and vertical acceleration. The three-dimensional numerical simulation is also conducted to compare the numerical results. Applicability of the numerical model with equilibrium and non-equilibrium sediment transport models to the local scouring around a spur dike and river channel processes is examined.