【摘要】 近几年来建立的各类暴雨产沙模型,基本都采用沟道、河川泥沙的输移比等于1的假定。通过分析黄土丘陵沟壑区和粗沙区沟道、河川的水沙关系、输沙特性和泥沙输移比,把一维明渠非恒定不平衡输沙模型应用到黄河中游地区,以推求泥沙输移比不等于1时,河段任一断面的水、沙过程及河段冲淤量。利用窟野河一次大洪水对该模型进行验证.结果符合良好。分析后提出,大流域暴雨产沙模型必须建立以水文学和河流动力学为理论基础的混合模型。更多还原

【Abstract】 Almost all the sediment yield models of heavy rainfall built in recent years have adopted the assumption of sediment transport concentration of gullies and rivers being equal to 1.Through the analysis on runoff/sediment relationship, characteristics of sediment transport and sediment transport concentration of gullics and rivers in gullied rolling loess area and coarse-sand area, the non-constant unequilibrium sediment transport model of one-dimensional open channel is applied into the middle reaches for calculating the processes of runoff and sediment and the amount of aggradation and degradation at any section when the sediment transport concentration is not equal to 1.The model is tested and verified by an event of major flood occurred in the Kuye River.The result shows good.The paper puts forward through the analysis that sediment yield model of heavy rainfall of a large river basin must be built on a mixed model of taking hydrology and dynamics of streams as a theoretical basis.更多还原