Abstract: In order to have a better research on the movement law of sediment in mountainous rivers，two novel influence factors of sediment movement were proposed，which were particle shape parameters and particle saturation of sediment，on the basis of classic formulas of sediment incipient motion． According to this，the influence of geometric shapes on the incipient motion was analyzed theoretically and experimentally． The single factor analysis method was applied，which switched the start grain quality to approximately equal level． The starting power and velocity formula are obtained which can reflect the influence of geometric shape particles．

Key words: incipient motion, geometric shapes, natural gravel, velocity formula

摘要： 为更好研究山区河流泥沙运动的规律，在泥沙起动经典公式的基础上，提出了泥沙颗粒形状系数、泥沙颗粒饱满 度两种新的对泥沙颗粒起动产生影响的因素。并据此展开几何形状对起动影响情况的理论和试验分析，采用单因素 分析方法，将起动颗粒质量转换到近似相等的层面上，得出能够反映颗粒几何形状影响的起动功率和流速公式。

关键词: 泥沙起动, 几何形状, 天然卵砾石, 流速公式