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基于冲积河流河床活动交换层动力学基本方程和悬移质不平衡输沙方程,利用数值方法计算了冲积河流冲刷不平衡输沙过程。结果表明,冲积河流床面沙波准周期性运动的动力学特征影响了河床中泥沙暴露至河床表面的速度,延缓了河床冲刷时由河床表面补充到水体中的速度,从而对悬移质不平衡输沙产生显著影响。分析结果同时表明,悬移质冲刷不平衡输沙恢复饱和系数的理论值是在不考虑沙波运动对河床内部泥沙暴露到河床表面的速度的制约条件下得到,使得理论值大于经验统计值。
Based on the basic equation of dynamics of bed exchange bed and the sediment transport equation of imbalanced sediment transport in the alluvial river, the imbalanced sediment transport process of alluvial river erosion was calculated by numerical method. The results show that the dynamic characteristics of quasi-periodic sand bed wave motion in the alluvial river affect the speed of sediment exposure to the surface of the riverbed in the river bed, and retard the speed of bed surface replenishment to the water body during riverbed flushing, Unbalanced sediment transport has a significant impact. The results of the analysis also show that the theoretical value of the saturation recovery coefficient of the imbalanced sediment transport is obtained under the constraint of the velocity of the sediment exposed to the riverbed surface without affecting the sand wave motion, making the theoretical value larger than the empirical value .