【摘要】 本文建立了一维数值模型来模拟顺直冲积渠道的冲刷过程 .模型考虑了床沙的非均匀性、床面形态变化 ,应用该模型预测计算了冲刷过程中的床沙级配变化 .模型计算结果表明床沙粗化过程不仅与水流的水力特性有关 ,还与床沙的颗粒大小及分布有关 .模型计算结果与 2组非均匀床沙水槽试验结果进行了比较 ,结果表明模型计算结果与试验结果符合得较好更多还原

【Abstract】 A numerical model to simulate the bed degradation process in a straight alluvial channel with respect to time and distance is introduced. The simulation takes into account the effect of non uniformity of the bed material, and variations in the dimension of bed forms. The model predicts the changes in the grain size distribution with the time and space during degradation process. The numerical model proposes that the armoring process in degrading channels does not depend only on hydraulic characteristics of the flow but also on variation in the grain size distribution of sediments on the bed. The model was applied and compared with the results obtained from experiments conducted in 24 m recirculating flume for two sizes of sand; a good agreement was found between observed and calculated values.更多还原