风沙输运是干旱或半干旱地区沙尘暴、土地退化等自然灾害频发的主要原因，其中颗粒的流体起动是诱发风沙运动的关键物理过程。现有研究主要集中于平坦床面，而更接近真实地形的坡面沙床流体起动过程有待进一步研究。本研究运用离散元法（Discrete Element Method, DEM）构建了坡面（0°- 20°）沙床DEM模型，模拟再现了坡面沙粒的流体起动过程。结果表明：坡度对流体起动效应的抑制作用呈现指数增长而非线性规律；从流体起动特征来看，相比于平坦床面，坡面上沙粒流体起动临界摩阻风速、响应时间均最高增长了约50%，流体起动率减小幅度高达90%；从沙粒流体起动过程来看，坡面上的沙粒需要累积更多的能量以达到足够的垂向动量，因此其滚动距离和碰撞次数均最高增长了近55%。本坡面沙粒流体起动方案能够加深对真实地形风沙运动过程的理解和认识，并进一步提高其预测精度。

Aeolian sediment transport is the main cause of frequent natural disasters such as dust-sand storm and land degradation in arid and semi-arid regions, among which the aerodynamic entrainment process of particles is the key physical process. The current research on aerodynamic entrainment mainly focuses on flat surface, while the aerodynamic entrainment of realistic slope bed requires further studies. In this study, the model of slope sand bed (0°- 20°) was established based on the Discrete Element Method (DEM), and the aerodynamic entrainment process on slope surface was simulated. DEM simulation results show that the inhibitory effect on the aerodynamic entrainment of sand particles exhibits an approximately exponential dependence on the slope, but not a linear dependence. From the perspective of aerodynamic entrainment characteristics, compared with flat surface, the threshold friction velocity and response time of sand particles on slope surface increase by approximately 50%, and the entrainment rate decreases by nearly 90%. From the perspective of the complete process of aerodynamic entrainment, sand particles on slope surface need to accumulate more energy to acquire enough vertical momentum, resulting in the rolling distance and the number of collision increase by nearly 55%. In this study, the scheme for aerodynamic entrainment of sand on slope bed was summarized, which can enhance the understanding of wind-blown sand movement in realistic terrain, and further improve the prediction accuracy.