圆弧型丁坝产生的卡门涡与坝后冲刷的关系  

Relationship between Karman vortex produced from arc spur dike and scouring behind spur dike

作　　者：高桂景 王平义[2] 杨成渝[2] 刘怀汉 

机构地区：[1]重庆市港航管理局,重庆400020 [2]重庆交通大学河海学院,重庆400074 [3]长江航道规划设计研究院,湖北武汉430011

出　　处：《水运工程》2012年第3期64-66,共3页Port & Waterway Engineering

基　　金：国家西部交通建设科技项目(2009328814012)

摘　　要：通过水槽试验,结合理论分析,探讨了圆弧型丁坝产生卡门涡的机理及坝后冲刷的原因,并进一步分析了卡门涡与坝后冲刷的关系。在卡门涡中心形成的低压区将泥沙吸入其中心,是坝下冲刷的主要原因之一。卡门涡边缘的线速度和来流速度的合成速度与坝后泥沙起动速度的关系,决定了坝后冲刷区和淤积区的分布。Based on the model experiment and theoretical analysis, we discuss the mechanism of Karman vortex produced from the arc spur dike and the reason of scouring behind the spur dike, and discuss the relationship between the Karman vortex and the scouring behind the spur dike. The distribution of the scouring area and the deposition area behind the dam depends on the relationship between the velocity which is synthesized by the linear velocity on the edge of the Karman vortex and the approaching velocity of the flow and the starting velocity of the sediment behind the dam.

关 键 词：丁坝 卡门涡 冲刷 

分 类 号：TV142[水利工程—水力学及河流动力学]