论文部分内容阅读
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。
Research on pebble bed mass motion law is of great significance to the development and utilization of mountain river. Plutonium particles generally roll (sliding or sliding), jumping and other forms of movement. In the low water flow intensity range, the particle movement is mainly rolling. Even the large part of the jumping particles often do not jump immediately after starting but often need to roll a distance first. Therefore, it is necessary to carry out sediment particle rolling mechanism research. In this paper, the coarse-grained sediment rolling dynamics model is established. The rolling steps are divided into contact steps and free steps, and the expressions of the separation angle, the single-step movement step and the average rolling speed are calculated. The Einstein’s method is used to correct The single-step and scour rate in the formula, and then the formula of bed mass transport rate is obtained, which is validated by the actual sand transport rate data.