泥沙研究

基于塔里木河新其满大桥河段河工模型试验，对主动可变调流桨片群在河道局部整治中的导流护岸性能开展研究。结果表明，交错排列的桨片群列可显著降低凹岸流速至原河道的40%～60%,同时将水流导向凸岸淤积体，其横向和纵向间距分别以1～2倍和6～8倍桨片长度为较优布置方案。在造床流量条件下，桨片群使河流动力轴线顶冲点向凸岸偏移183 m,凸岸近岸流速提升至2～3 m/s,而凹岸流速被有效抑制。水流受桨片导流效果影响，导向凸岸侧淤积体，71.11%的淤积体面积被淹没，形成表面流速为0.3～0.5 m/s的漫滩水流，冲刷淤积体；水流与淤积体的接触面积及剪切力增大，促进冲刷效率。该技术通过调整水流结构，平衡凹岸侵蚀与凸岸淤积，为河道整治工程提供了优化水流分配、增强冲淤调控的新方法。

Based on the physical model experiments of the Xinqiman Bridge reach of Tarim River, the performance of active adjustable paddle arrays of flow deflector has been studied. The results demonstrate that staggered paddle arrays can reduce flow velocity by 40%～60% near the concave bank, and direct the main flow to the sediment body on the convex bank. The optimal paddle arrangement scheme is that the transverse and longitudinal spacing is 1～2 times and 6～8 times the length of paddles, respectively. With the effect of the optimal laying paddles at the dominant flow discharge, the hydrodynamic axis impact point offsets 183 m to the convex bank, near-bank velocity increases to 2～3 m/s at the convex side, while the velocity and erosion near the concave bank is suppressed. Redirected flow submerges 71.11% of sediment body and generats overbank currents of 0.3～0.5 m/s, which enhancing scouring efficiency through expanded contact area and increased shear stress. By restructuring flow pattern to balance erosion in the concave bank and deposition in the convex bank, this technology offers a novel approach for optimizing flow distribution and controlling erosion and deposition in the river regulation engineering.