3D NUMERICAL MODEL OF SEDIMENT TRANSPORT CONSIDERING TRANSITION FROM BED-LOAD MOTION TO SUSPENSION —APPLICATION TO A SCOUR UPSTREAM OF A CROSS-RIVER STRUCTURE—
3D NUMERICAL MODEL OF SEDIMENT TRANSPORT CONSIDERING TRANSITION FROM BED-LOAD MOTION TO SUSPENSION —APPLICATION TO A SCOUR UPSTREAM OF A CROSS-RIVER STRUCTURE—
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考虑从河床荷载运动到悬浮状态转变的泥沙输运 3D 数值模型——在跨河结构上游冲刷中的应用——
DOI：
10.2208/journalofjsce.4.1_173
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发表时间：
2016
期刊：
影响因子：
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通讯作者：
H. Nakagawa
中科院分区：
文献类型：
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作者：
Kazuyuki Ota;Takahiro Sato;H. Nakagawa
本研究提出一种新的三维数值模型，用于模拟水工建筑物周围的水流和河床变形，考虑推移质运动到悬浮的过渡过程。流体的数值分析是通过求解雷诺平均Navier-Stokes（RANS）方程与流体体积（VOF）方法耦合进行的。通过耦合随机模型的泥沙拾取，沉积和过渡和泥沙颗粒的动量方程来计算床面地形的时间变化，以考虑非平衡和过渡的影响，从推移质悬浮。数值模型被应用到一个实验冲刷现象上游的狭缝堰，其中的初始床高程低于顶部高程的狭缝（即，所有侵蚀颗粒都经历了由推移质向狭缝周围悬浮物的转变过程）。数值计算结果与试验结果的比较表明，该模型能够较准确地模拟出窄缝堰周围的冲刷形态。
This study suggests a novel 3D numerical model for simulating the flow and bed deformation around hydraulic structures, considering the transition process from bed-load motion to suspension. The numerical analysis of the fluid is carried out by solving the Reynolds-averaged Navier-Stokes (RANS) equations coupled with the Volume of Fluid (VOF) method. The temporal change in bed topography is calculated by coupling a stochastic model of sediment pickup, deposition, and transition and a momentum equation of sediment particles to account for the effect of non-equilibrium and transition from bed load to suspension. The numerical model was applied to an experimental scour phenomenon upstream of a slit weir, in which the initial bed elevation was lower than the crest elevation of the slit (i.e., all eroded particles experienced the transition process from bed load to suspension around the slit). A comparison between the numerical results and experimental data indicated that the model could reproduce the scour geometry around the slit weir with sufficient accuracy.