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为分析汊道口门处水流结构对悬移质分沙的影响,采用带旋流修正的k-ε双方程紊流模型,对分汊河道分流口门处的三维水流结构进行精确计算,并在此基础上,采用可考虑相间滑移的混相流模型对不同形态分汊河道的悬移质分沙进行计算。计算结果显示了分汊口门处表底层水流的差异及横向环流的存在等现象,与前人的实验值吻合良好。对直角分汊口不同来沙粒径、不同宽深比的悬移质分沙的计算结果表明,分汊口门处的环流强弱和悬移质垂线分布是影响汊道分沙比与分流比关系的主要因素。在河道宽深比较小,来沙垂线分布不均匀的情况下,汊道分沙比远大于分流比。
In order to analyze the effect of water flow structure on the suspended sediment at the mouth of the mouth, the k-ε two-equation turbulence model with swirling correction was adopted to accurately calculate the three-dimensional water flow structure at the outlet of the diversion channel. On this basis, the mixed-phase flow model that can consider interphase slip is used to calculate the suspended sediment of different forms of sub-channel. The calculation results show the difference of bottom water flow and the existence of transverse circulation in the entrance of sub-inlet, which is in good agreement with the previous experimental data. The results of calculation of the suspended sediment with different grain sizes and different aspect ratios at different angles at different angles show that the vertical distribution of the circulation and the vertical distribution of the suspended sediment at the entrance to the mouth are the main factors affecting the ratio of sediment yield The main factor of the diversion ratio. When the width and depth of the river are relatively small and the vertical distribution of incoming and outgoing sand is not uniform, the ratio of sand and sediment is much greater than that of diversion.