摘要
临界底坡在均匀流中可以用作判别水流流态,临界底坡随流量的变化规律随着断面形式的变化而有所不同。针对3种不同的断面形式,从理论上推导出它们的最小临界底坡公式。分析结果显示:矩形、圆形和U形3种不同的过水断面均存在最小临界底坡,iKmin分别为26.
In a uniform flow, critical bed slope can be used to discriminate the flow pattern. The variation of critical bed slope against flow varies with the section＇ s shape. The formulas of minimum critical bed slope for three differ-ent sections were deduced according to theoretical analysis. The results show that these three sections, i.e. rectan-gular, circular and U-shaped section all has a minimum critical bed slope ikmin=26.13n^2/b^1/3,22.335n^2/d^1/3 and 22.335n^2/（2r）^1/3respectively. The variation in flow pattern can be discriminated conveniently by comparing the actual dis-charge with the discharge when critical bed slope equals the actual bed slope. This method is simpler and more con- venient than the method which determines the flow pattern by calculating critical depth and normal depth.
出处
《长江科学院院报》
CSCD
北大核心
2013年第6期47-51,共5页
Journal of Changjiang River Scientific Research Institute
基金
浙江省自然科学基金资助项目(Y110094)
浙江省重点创新团队及水利河口研究院省重点实验室资助项目(FZ1102)
浙江省科技厅资助项目(2012C21105)
关键词
临界底坡
明流均匀流
流态
变化规律
断面
critical bed slope
free uniform flow
flow pattern
variation regularity
section
