考虑到泥沙颗粒暴露度以及颗粒形状对泥沙起动流速的影响，通过概率论与力学相结合的方法，推导得到了非均匀沙起动概率公式，从而建立了起动流速与起动概率之间的明确关系。与实测起动流速对比表明，该公式能正确反映非均匀沙的运动规律。

The incipient motion of sediment is one of the most important subjects for the research of river dynamics. In this paper, the probability formula of incipient motion of non-uniform sediment was deduced using the combination method of probability and mechanics in consideration of the impacts of exposure degree and shape of sediment on the threshold velocity. The relationship between threshold velocity and threshold probability was developed. Compared with the measured incipient velocity, the formula can reflect the movement of non-uniform sediment accurately.

教育部“长江学者和创新团队发展计划”资助项目（IRT1139）