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泥沙恢复饱和系数是泥沙数学模型中一个非常重要的参数,其取值合理与否将直接关系到利用泥沙数学模型进行河床演变及相关研究的成败.基于三峡水库蓄水后长江中游荆江河段的实测水沙资料,以本河段三峡水库蓄水前多年平均输沙水平作为泥沙输移方程中的挟沙能力,对水库下游非均匀沙恢复饱和系数进行了率定与分析,并在总结其规律的同时从多个方面对率定结果的合理性进行了讨论.研究结果表明,水库下游非均匀沙恢复饱和系数的数量级一般可达10-3～10-1,并且一般随着泥沙粒径的增大而减小,随着河床冲刷历时的增加和床沙粗化程度的提高而呈递减的趋势.
Satisfactory coefficient of sediment recovery is a very important parameter in the sediment mathematical model.It is directly related to the success or failure of using the sediment mathematical model to make riverbed evolution and related research.According to the Jingjiang River in the middle reaches of the Yangtze River The measured data of water and sediment in the reach of the Three Gorges reservoir before the impoundment of the Three Gorges Reservoir for many years as the sediment transport capacity of sediment transport capacity of the sediment transport capacity of the unsaturated reservoir in the lower reaches of the saturation recovery coefficient of the rate set and analyzed, And discussed the rationality of the calibration results in many aspects while summing up its regularity.The results show that the magnitude of the saturation recovery coefficient of the non-uniform sand in the downstream of the reservoir can generally reach 10-3 to 10-1, With the increase of sediment particle size, it decreases with the increase of riverbed erosion duration and the increase of sediment coarsening.