摘要
对非均质流挟沙力研究现状分析表明,目前悬移质水流挟沙力公式存在的问题:一是未能正确反映水流势能转化为动能过程中必须考虑的阻力因子;二是未能正确处理泥沙颗粒的非均匀性特点;三是未能正确计算悬液黏度对颗粒沉速的影响。本文基于大量室内平衡输沙试验及野外河渠准平衡输沙观测资料,建立了非均匀沙悬移质输沙平衡关系,得到了新的适用于各级含沙量的非均匀沙悬移质挟沙力公式。进而根据建立的输沙平衡关系,得到了挟沙水流的不淤流速及阻力坡降关系,可用于河道治理及渠系设计。
A review of present research on sediment carrying capacity of two-phase heterogeneous flows re- veals several shortcomings in existing suspended-sediment carrying capacity formulas, which firstly do not reflect the friction factor correctly when potential energy converts into kinetic energy, and secondly do not account the non-uniformity of sediment particles well and thirdly, cannot correctly calculate the effect of viscosity of suspended sediment solution on fall velocity of sediment particles. An equilibrium relation of non-uniform sediment transport has been established and sediment carrying capacity formulas are obtained, which can be used for non-uniform sediment with various amount of sediment concentrations. At top of this, relations of non-deposition velocity and friction slope for two-phase heterogeneous flows have also been obtained, which can be used for design of river training and channels.
出处
《水利学报》
EI
CSCD
北大核心
2015年第7期757-764,共8页
Journal of Hydraulic Engineering
基金
国家"十二五"科技支撑计划资助项目(2012BAB02B02)
关键词
高含沙水流
非均质流
输沙能力
不淤流速
阻力特性
Hyperconcentrated flow
heterogeneous flow
sediment carrying capacity
non-deposition velocity
resistance characteristics
