中文摘要：

碎片流动的在点上观察和地侦察表明了在一条活动隧道的纵的侧面的屈折变化点可以容易成为显著地影响他们的乘火车行为的不稳定的点。在这研究，小规模的斜槽实验被执行调查超过二打字的碎片流动的乘火车特征也就是，屈折变化削尖一个凸的点，它有是的一个 upslope 坡度不到下坡的坡度；并且一个凹面点，它有比下坡的坡度大的一个 upslope 坡度。当碎片溢出了一个凸的点时，乘火车逐渐地发展了并且日益增多地从在下游的方向，和主要控制因素的凸的点是斜坡坡度和磨擦角度，这被观察。相反地，当碎片溢出了一个凹面点时，乘火车被影响并且侵犯侵蚀而非传统的水力的侵蚀描绘，并且流动的冲击角度显著地决定了最大的侵蚀深度和流出出口角度。在地形学变化和控制因素之间的一种实验关系从试验性的数据被获得。

英文摘要：

On-spot observation and field reconnaissance of debris flows have revealed that inflexion points in the longitudinal profile of a movable channel may easily become unstable points that significantly affect their entrainment behavior. In this study, small-scale flume experiments were performed to investigate the entrainment characteristics of debris flows over two types of inflexion points, namely, a convex point, which has an upslope gradient that is less than the downslope gradient; and a concave point, which has an upslope gradient that is greater than the downslope gradient. It was observed that when debris flowed over a convex point, the entrainment developed gradually and progressively from the convex point in the downstream direction, and the primary control factors were the slope gradient and friction angle. Conversely, when debris flowed over a concave point, the entrainment was characterized by impacting and impinging erosion rather than traditional hydraulic erosion, and the impingement angle of the flow significantly determined the maximum erosion depth and outflow exit angle. An empirical relationship between the topography change and the control factors was obtained from the experimental data.