运用泥沙隐蔽度的研究成果，结合泥沙起动的滚动模型，导出了以隐蔽度为参数的泥沙近底作用起动流速公式。通过对该式分别进行的极限分析和单调性分析，论述了散体沙起动的几个物理现象，论证了宽级配非均匀沙的起动特性。经过对泥沙颗粒隐蔽度分布特性及泥沙起动标准的分析，建立了泥沙颗粒隐蔽度与无因次起动切应力之间的数值关系。最后借鉴前人的研究成果，验证了本文公式的适用性。

Based on the results of sediment hidden degree research, an incipient velocity formula with hidden degree as its parameter was deduced in this paper using the rolling model of sediment incipient motion. The formula was applied in limit analysis and monotonicity analysis to theoretically expound the physical phenomena of incipient motion and to demonstrate the starting characteristic of broadly graded non  uniform cohesionless sediment. The numerical relations between hidden degree and non-dimensional incipient shear stress were established via the analysis on incipient motion criterion and the characteristic of hidden degree distribution of cohesionless sediment particles. Finally, former research achievements are taken to manifest the applicability of this incipient velocity formula.