For the study of the effects of partially non-submerged rigid vegetation on the free-surface confluence flow in a curved open channel, a numerical simulation is carried out by using the Volume of Fluid model combined with the porous media model with the software OpenFOAM. The model is first validated by using available experimental measurement data with a good agreement. Then, the characteristics of the separation zone generated by the centrifugal forces and the confluence flow are analyzed. Due to the resistance created by the vegetation, the velocities in the separation zone are more chaotic and the separation zone becomes smaller and more irregular. The reduction of the separation zone area of the vegetated flow in the convex bank is more significant than that in the concave bank. The velocities in the vegetated region become much smaller and remains so in the downstream flow after the vegetation region. Meanwhile, the vegetation compresses and divides the circulations in the flow area, rebuilding a structure with smaller circulations in the main flow and unclear circulations in the vegetation region. In addition, the bed wall shear stresses are significantly smaller in the vegetation region and the separation zone compared to the non-vegetated flow. This implies that the vegetation can have the effect of protecting the river bed from erosion.

为研究部分非淹没刚性植被对弯曲明渠自由表面汇流流的影响，采用流体体积模型结合多孔介质模型，利用OpenFOAM软件进行数值模拟。该模型首先通过使用具有良好一致性的可用实验测量数据进行验证。然后，分析了离心力和汇流产生的分离区的特性。由于植被产生的阻力，分离带内的速度更加混乱，分离带变得更小、更不规则。凸岸植被流分离区面积的减少比凹岸更显着。植被区中的流速变得小得多，并且在植被区之后的下游流中仍然如此。同时，植被对流域内的环流进行了压缩和分割，重建了主流环流较小、植被区环流不清晰的结构。此外，与非植被流相比，植被区和分离区的床壁剪应力明显较小。这意味着植被可以起到保护河床免受侵蚀的作用。与非植被流相比，植被区和分离区的床壁剪应力明显更小。这意味着植被可以起到保护河床免受侵蚀的作用。与非植被流相比，植被区和分离区的床壁剪应力明显更小。这意味着植被可以起到保护河床免受侵蚀的作用。