Abstract
Hydro-instability of hyper-concentrated flow in the Yellow River is one of the focuses of Chinese sediment research. In this research, the constitutive relations and the equations of the hydro-instability are first explores. Based on the experimental results and field data, Bingham fluid model is simple and appropriate for the hyper-concentrated flow. Next, the hydro-instability characteristics of hyper-concentrated flow in the Yellow River are discussed, which is judged with the neutral curve by using perturbation method and the summarized Bingham fluid model; then, the variation of the neutral curve is analyzed with sediment parameters, which are size distribution and its median, representing as critical concentration and concentration. Additionally, the variations of ratio of such characteristic parameters as Reynolds number of turbid water to clear water are obtained to represent the relation between Bingham fluid and ordinary Newtonian fluid, which can be applied to judge the flow pattern in the Yellow River.
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