推移质输沙率的能量平衡模型

基于能量平衡观点,推移质泥沙输移所需能量来自水流的势能。由于密度差异和推移质所受到的重力作用和颗粒之间的碰撞和摩擦作用,推移质运动滞后于水流的运动,推移质所消耗的能量取决于水沙的相对运动。据该理论,推导出推移质输沙率关系式。选择无量纲参数确定有关参数的影响因素,采用试验资料对有关参数进行了率定。所建立的计算公式与试验资料符合较好,计算精度较高。

Energy equilibrium model of bed-load transport rate

Based on an energy equilibrium viewpoint,the bed-load transport energy comes from the flow energy.The bed-load motion lags the flow and the consumed energy of bed load depends on the relative motion between the flow and particles.A bed-load transport relation is deduced.According to the experimental data,the influential factors of the parameters of the bed-load transport relation are determined.Using the experimental data,the parameters of the bed-load transport relation are validated.The formula is in good agreement with the experimental data with higher accuracy.