弯道凹岸边壁上的泥沙起动

Incipient motion of sediment particles on concave bank slope

对弯道边壁泥沙起动做了较深入的分析,建立了较清晰的物理图形,考虑了五种力,并较全面地分析了各种力的作用,导出了最一般条件下包括粗、细泥沙在河床上不同位置的起动流速公式。该公式概括性高,它可以简化为顺直河流边壁泥沙起动以及床面泥沙起动条件下的公式。采用试验资料对该公式进行了检验,其理论结果与实测是符合的。

Based on the method of fully considering the incipient motion of sediment particles on a sloping river bend, a clear physical graphics is established. The five kinds of forces and their roles are considered and analysed comprehensively. A theoretic formula about the incipient velocity of sediment particles is derived which is suitable for the most general conditions including coarse and fine sediment at different positions on the river bed. The formula is all-embracing wide. It can be simplified as the formula for calculating the incipient velocity on the side wall of a straight river and on the bed surface. The formula is tested by experimental data and the theoretical results are consistent with the measured values.