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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。
The analysis of the present situation of sediment-carrying capacity of heterogeneous flow shows that there are some problems in sediment-carrying capacity formula of suspended sediment flow: firstly, it fails to correctly reflect the resistance factor which must be considered in converting the potential energy into kinetic energy; second, Dealing with the characteristics of non-uniformity of sediment particles; third is the failure to correctly calculate the impact of suspension viscosity on sedimentation rate. Based on a large number of indoor sediment transport experiments and quasi-equilibrium sediment transport in open channel, the relationship between sediment transport and non-uniform sediment transport was established, and a new non-uniform sediment transport system Sand formula. Furthermore, according to the established relationship between sediment transport and sediment yield, the relationship between sediment-laden flow velocity and non-flow velocity is obtained, which can be used for river channel management and canal design.