【摘要】 基于能量平衡观点,床面泥沙上扬能量来自于水流的势能,所消耗的能量取决于水沙的相对运动,推导出上扬通量关系式,根据垂向流速分布公式确定参数的影响因素,采用实验资料对有关参数进行了率定。所建立的计算公式与实验资料符合较好,与其他公式相比较,该式结构较简单和计算精度较高,可较好的为泥沙数学模型提供近底含沙量边界条件。更多还原

【Abstract】 Based on the viewpoint of energy equilibrium,energy of sediment entraining from bed surface comes from the flow energy and the consumed energy depends on the relative motion between the flow and particles.A sediment pick-up flux relation is deduced.According to the formula of vertical velocity distribution,the influence factors of the main parameters of the sediment pick-up flux relation are determined.Using the experimental data,the parameters of the sediment pick-up relation are validated.The formula is in good agreement with the experimental data.Compared with other formulas,the accuracy of the established formula is higher.This formula can provide the better boundary condition of sediment concentration on bed surface for sediment-transport mathematical models.更多还原