摘要
水流经过水工建筑物后，由于河面突然扩宽，在扩宽的一侧就会形成回流，使从上游下来的泥沙在回流中沉积下来。这种局部性的水流现象常常会在一般水工模型试验中遇到，因此对建筑物下游水流流态及航道布设产生的影响就成为试验关心的问题之一。为了探求这种由于水流平面突扩形成的平面回流的一般规律，本文进行了概化模拟试验，研究回流的水流结构，如回流流量、回流长度、流速分布等方面特性，得到了一些规律性认识；对回流区的底沙运动、淤积规律进行了定性研究；并将本文研究成果运用于实际工程，取得了较为满意的结果。
After the flow passes the hydraulic structure,due to sudden expansion of river surface, l.ackflow will be formed on the expanding side,causing the sediment coming from upstream deposit in the backflow. Such local flow phenomenum often takes place in hydraulic modeling. Hence, its effect on flow regime downstream the hydraulic structure and the layout of channel becomes one of problems concerned in modeling. In order to explore the general rule of plane back flow formed by sudden expansion of flow surface,conceptual analog test has been carried out in this paper to study the flow structure of backflow.such as characteristics in discharge of backflow,length of backflow and distribution of velocity.Some regular knowledge has been obtained.Qualitative research has been conducted on the movement of bottom sediment in the back flow area and on the rule of siltation. Results of foe study in this paper have been applied in practical project and satisfactory outcome has beed achieved.
出处
《人民珠江》
1996年第6期16-19,共4页
Pearl River
关键词
水工建筑物
回流
水流结构
底沙淤积
hydraulic structure, backflow, flow structure, bottom siltation
