【摘要】 阐述了泥沙起动机理,通过对等效粒径概念及表达式的引入,推得了泥沙起动公式。该公式的系数并非一个常量,而是位于某个区间,且随泥沙粒径、相对暴露度及起动标准而变。同时得到了均匀沙的起动公式,该公式系数同样位于一个区间。通过与部分均匀沙公式的系数比较可知,所给出的系数的取值区间基本涵盖了其他公式系数。说明采用等效粒径能反映泥沙的起动特性。更多还原

【Abstract】 The formula for calculating the incipient motion condition of non-uniform sediment has been established by considering the equivalent grain and the relative exposure degree. The results show that the coefficient of the formula is not a constant but varies in a range with the diameter, relative exposure degree and incipient status of grain. The formula for uniform sediment has also been obtained, with the coefficient in a range. The domain of coefficient value calculated in the formula has been verified by using other coefficient data. The results show that the equivalent grain can reflect the characteristics of the sediment incipient motion.更多还原