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混合粒径条件下沉积物的起动机理不同于均匀粒径条件下沉积物的起动机理。混合粒径条件下沉积物的起动,可由沉积物转动角Φ随相对粒径及颗粒形状而变化的依从关系进行解释。通过对砾石沉积物因木同粒径、形状而发生选择性起动的动力过程的分析,得出了砾石沉积物转动角选择性起动的理论模式,采用该模式来定量计算潮汐流和河流中砾石沉积物选择性起动的临界值,计算结果和测量结果吻合,从而证实了该模式的可靠性。
The onset mechanism of sediment under mixed particle size is different from that of sediment under uniform particle size. The onset of sediment under mixed particle size conditions can be explained by the dependency of sediment rotation angle φ with the relative particle size and particle shape. Based on the analysis of the kinetic process of gravel sediment selective starting due to its particle size and shape, the theoretical model of selective initiation of gravel sediment rotation angle is obtained. The model is used to quantitatively calculate the tidal current and gravel in the river The critical value of selective start of sediment is in agreement with the measured result, which confirms the reliability of this model.