中文摘要：

卵石推移质运动规律研究对山区河流开发利用意义重大。推移质颗粒一般是以滚动（间或滑动）、跃移等形式运动的。在低水流强度范围内,颗粒运动形式以滚动为主;即使占推移质大部分的跃移颗粒,通常也并不是在起动之后随即跃起,而往往需要先滚动一段距离。因此,有必要进行泥沙颗粒滚动机理研究。本文建立了粗颗粒泥沙滚动力学模型,将滚动步划分为接触步和自由步,经计算得到脱离角、单步运动步长、平均滚动速度等表达式;并采用爱因斯坦方法,修正了其公式中的单步步长和冲刷率,进而得到相应的推移质输沙率公式,并用实际输沙率资料进行了验证。

英文摘要：

Gravel bedload transport is of great significance to the development and utilization of mountain-ous rivers. Generally,the bed particles may perform rolling,sliding or saltating motions depending on flowand bed conditions. In low flow intensity range,rolling is the main form of movement;even the saltationparticles which account for the majority of bedload usually need to roll some distance before leaps. There-fore,it is necessary to carry some research into rolling sediment particles. On the basis of analyzing theforces of one rolling particle,a mechanical model was built which divided a single-step movement into twoparts,i.e. touching movement and free movement. Then expressions for the rate and distance of a single-step movement were obtained by methods of numerical calculation and regression analysis. Finally by modify-ing the erosion probability of particles and the dimensionless step length used in Einstein＇s bedload func-tion transport rate formula was derived and validated with actual measured data.