【摘要】 在考虑水流条件、床沙组成的基础上,通过对泥沙颗粒受力分析,建立了滚动平衡方程式,得出非均匀沙分级起动切应力公式.在建立公式的过程中考虑了床沙非均匀性对起动的影响,定义了附加作用力G,并将其引入公式中.通过实验数据的验证表明公式的计算结果与实验数据符合良好.更多还原

【Abstract】 Based on the analysis of water flow condition, composition of bed sediment, and forces on grains, a rolling balance equation for grains is developed, and a formula for stage threshold shear stress of non uniform sediment is derived. In the derivation of the formula, the non uniformity of bed sediment is considered, and an additional force G is defined and introduced. It is verified that the calculated results are in good agreement with the experimental data.更多还原