Quantifying incipient sediment motion in vegetated open channel flow is pivotal for estimating bed load transport and the aquatic ecological environment in rivers. A new formula is developed to predict the critical flow velocity for incipient sediment motion in the presence of emergent vegetation, by incorporating the influence of vegetation drag that characterizes the effects of mean flow and turbulence on sediment movement. The proposed formula is shown to agree with existing experimental data. Moreover, the proposed formula is extended to scenarios with submerged vegetation, suggesting that the vegetation drag may be the inherent impact factor for incipient sediment motion in vegetated open channel flow.

量化植被明渠流中的初始沉积物运动对于估计河流中的河床荷载传输和水生生态环境至关重要。通过结合表征平均流和湍流对沉积物运动影响的植被阻力的影响，开发了一种新公式来预测在出现植被时初始沉积物运动的临界流速。表明所提出的公式与现有的实验数据一致。此外，所提出的公式被扩展到有淹没植被的场景，表明植被阻力可能是植被明渠流中初期沉积物运动的内在影响因素。