学术
摘 要:
潜入点的水流泥沙条件是异重流的发生条件和持续条件，受到了国内外学者的广泛关注。初期潜入点Fr代表异重流的发生条件，而稳定潜入点Fr则代表异重流的持续条件。通过一系列的低浓度浊流和高浓度浊流及泥石流的异重流潜入点的实验研究，分析对比低浓度浊流和高浓度浊流及泥石流的异重流的关系，得到在均匀顺直水槽中的异重流初期的潜入点Fr规律。提出在一定的水槽宽度、泥沙浓度条件下，异重流的初期潜入点Fr与头部流速成正比。与其它文献不同研究条件的实验结果对比有很好的一致性，说明该研究结论有很好的可靠性。该研究结论的适用范围为初期潜入点，不适用于稳定潜入点和初期潜入点与稳定潜入点之间的过渡阶段。但高浓度浊流和泥石流的异重流初期潜入点Fr与其稳定潜入点Fr很接近，粘性泥石流的异重流更接近。[著者文摘]
文章出处:
《水科学进展》-2008年19卷1期 -27-35页
文献标识码:
A
文章编号:
1001-6791（2008）01-0027-09
Experimental study on the incipient plunging point of stratified flow of turbidity currents and debris flows
YU Bin （lnstittae of Mountain Disaster and Environment, Chinese Academy of Sciences, Chengdu 610041, China ）
Abstract:
World-wide attention has been paid to the plunging point because it is the forming and persisting conditions of strat- ified flows. Incipient plunging point Froude number （Fr） is the forming condition of stratified flows and the stable plunging point Fr is the persisting condition of stratified flows. A series of experiments were conducted in a flume to study plunging point of stratified flows of low density turbidity currents, high density turbidity currents and debris flows. The rule of incipient plunging point Fr in uniform and straight channel was found. The incipient plunging point Fr of stratified flow is direct pro- portion al to the head velocity of stratified flow at given width of channel and given concentration of sediment. Compared the different experimental results from others references, the results of this study have good reliability as they have good consisten- cy. The results of this study are applicable only for the incipient plunging point instead of the stable plunging point and the transition between the incipient plunging point and the stable plunging point. But the stable plunging point Fr of stratified flows of high density turbidity currents and debris flows is very close to their incipient plunging point Ft. This approach is more desirable when the debris flow has strong viscosity.[著者文摘]
Key words:
turbidity currents ; debris flow; stratified flow; incipient plunging point ; experimental study
基金资助:
国家自然科学基金资助项目（40271003）
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