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中文摘要：
本文在评述目前关于含沙量比尺确定方法的基础上，指出前人采用λs确定的含沙量比尺，不能满足水流挟沙相似条件。剖析所找的原因是相似分析时，采用了不能同时适用于原型和模型且简化成指数等于1的半经验水流挟沙力公式，推导过程中又引入系数比尺等于1的假定，并以不考虑紊动扩散作用影响的λw作为泥沙悬移相似条件。选用容重适中的模型沙所开展的试验论证结果表明，含沙量比尺的大小对河床变形相似有直接影响，该比尺小于1时河床变形与原型偏差较大，该比尺与淤积物干容重比尺相近时，模型同原型才较为相似。此外，文中还认为，目前确定含沙量比尺的办法最好是通过分别确定原型和模型水流挟沙力的途径来实现。
英文摘要：
This study presents the method to determine sediment concentration scale in movable-bed model experiments. Firstly various methods by other researchers are reviewed, and it is concluded that the scale deduced by the equation λs, and could not meet the similarity condition for the river-bed deformation. The reasons causing errors are as follows ： （ 1 ） the semi-empirical formula for sediment transportation capacity was adopted in the process of similarity analysis, which could not be synchronously applied on the model and the prototype; （2） The coefficient scale was assumed to be 1 ; （3） The effect by the turbulence and diffusion of λw had not been taken into account in the similarity criteria of movable-bed model with suspended load. Then a feasible approach is recommended to calculate the sediment concentration scale by the sediment transportation capacity of the model and the prototype. At last, three series of experiments were implemented to search the relationship of the sediment concentration scale between the river-bed deformation similarity, and the result illustrated that the river-bed evolvement in the model experiment was more similar to that in prototype while the sediment concentration scale is close to dry density scale.
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