Erosion of sediments is of crucial significance to morphologic evolution, management of water quality and aquatic ecosystems. However, the prediction of the pickup rate of non-cohesive sediments is a challenging topic because of the complex interaction between the bed and the flow. This study reports the experimental results of the pickup rate of non-cohesive sediments in uniform flows. Six groups of uniform sand with diameters in the range of 0.183 mm to 1.090 mm were tested. The pickup rate was measured near the erosion thresholds. The experimental data, along with the data collected from previous studies, are applied to evaluate existing formulae for the grain-by-grain pickup rate. Those commonly used formulae fail to reproduce measurements well at both the high and low entrainment rate conditions. Efforts are made to revise the formula of Cao (1997) to predict the grain-by-grain pickup rate at both the high and low entrainment rate conditions.

沉积物的侵蚀对形态演化、水质管理和水生生态系统具有至关重要的意义。然而，由于床层和流动之间的复杂相互作用，非粘性沉积物的吸收率的预测是一个具有挑战性的话题。本研究报告了非粘性沉积物在均匀流动中的吸收率的实验结果。测试了六组直径在0.183 mm至1.090 mm范围内的均匀砂。拾取率是在侵蚀阈值附近测量的。实验数据以及从先前研究中收集的数据被用于评估现有的逐粒拾取率公式。那些常用的公式在高和低夹带率条件下都不能很好地再现测量结果。