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基于泥沙起动的已有研究成果,采用起动流速统一表达式回归分析了多份试验资料,探讨了起动流速公式中起动系数的取值范围。考虑到非均匀沙之间的荫蔽作用对泥沙起动规律的影响,在泥沙粒径计算公式中引入荫蔽参数,分析了不同水槽试验资料中荫蔽参数的取值。对水槽试验非均匀沙起动流速的计算值与实测值资料的比较研究表明,起动系数一般为4.1～5.3;初始松散床面泥沙时荫蔽参数较小,可取0.2,但能否应用于山区天然河流中还有待进一步研究。
Based on the existing research results of sediment start-up, several test data were analyzed by using the unified expression of start-up flow rate, and the range of start-up coefficient in the start flow rate formula was discussed. Considering the influence of the shading effect of non-uniform sand on the law of sediment start-up, the shading parameters are introduced into the calculation formula of sediment particle size, and the values of shading parameters in different test data are analyzed. The comparative study of the calculated and measured data of the inhomogeneous sediment flow velocity in the flume shows that the starting coefficient is generally 4.1-5.3. The shading parameter of the initial fluffy sediment bed is small, preferably 0.2, but it can be applied to the natural The river has yet to be further studied.