河道中钝体周围的床面冲刷试验研究

对泄洪闸闸墩、淹没薄壁长立方体以及圆柱形桥墩周围的河床床面冲刷进行了较为详细的试验。以试验所获得的大量测试数据、录像资料及照片为基础，分析了钝体周围的水流速度场、水流旋涡场、并重点分析了钝体周围的床面冲刷与钝体周围水流旋涡结构的关系，得出了关于河道中钝体周围床面冲刷的一些规律性结论。

The experimental study on local scour around blunts on rivers

Experiments to study clear water scour around different blunts (circular pier, sub-merged rectangle, sluice pier etc) were conducted in two flumes. On the basis of obtained experi-mental materials, the fluid velocity fields and the fluid vortex fields as well as the relationship between the scour and the scour and the vortex structure are analyzed in detail. Horseshoe vortices and wake vortices are generated while water passes a blunt, and loss of fluid velocity and complicated movement of vortices exist in wake region. The experiments show clearly that the local lo-cal scour around blunts is mainly caused by horseshoe vortices near blunts, vortices near the blunts pick up sediment on the bed, solid particles(sediment)are drawn into the vortex struc-tures, solid particles drawn into the vortex structures, controlled by vortices, move away the definite interrelated structure exists between the movement of particles and the fluid vortices in liquid-particle two-phase flow.