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两相非均质流输沙平衡关系及挟沙力研究
引用本文:费祥俊,吴保生,傅旭东.两相非均质流输沙平衡关系及挟沙力研究[J].水利学报,2015,46(7):757-764.
作者姓名:费祥俊  吴保生  傅旭东
作者单位:清华大学水沙科学与水利水电工程国家重点实验室, 北京 100084,清华大学水沙科学与水利水电工程国家重点实验室, 北京 100084,清华大学水沙科学与水利水电工程国家重点实验室, 北京 100084
基金项目:国家“十二五”科技支撑计划资助项目(2012BAB02B02)
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。

关 键 词:高含沙水流  非均质流  输沙能力  不淤流速  阻力特性
收稿时间:2014/8/11 0:00:00

Equilibrium sediment transport relation and sediment carrying capacity of two-phase heterogeneous flows
FEI Xiangjun,WU Baosheng and FU Xudong.Equilibrium sediment transport relation and sediment carrying capacity of two-phase heterogeneous flows[J].Journal of Hydraulic Engineering,2015,46(7):757-764.
Authors:FEI Xiangjun  WU Baosheng and FU Xudong
Affiliation:State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing 100084, China,State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing 100084, China and State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing 100084, China
Abstract:A review of present research on sediment carrying capacity of two-phase heterogeneous flows reveals 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.
Keywords:Hyperconcentrated flow  heterogeneous flow  sediment carrying capacity  non-deposition velocity  resistance characteristics
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