沙波运动与推移质输沙率

基于沙波运动,通过理论分析水沙运动的动力学因素,合理概化水沙运动模式,综合分析水流运动过程中所受到的力,利用沙波迎流面水体的动量方程,从理论上研究沙波波高随水流运动变化的数学表达,并将其与推移质输沙率联系起来,建立一个推移质输沙率与相对水流强度的数学关系式.计算分析表明,公式所能描述的规律与室内外资料相符,能较好地反映推移质输沙率与相对水流强度间的正向变化的全过程,具有理论和实用价值.

Sand ripple movement and bed-load transport rate

Based on the sand ripple movement,through theoretically analyzing the driving force factor of water and sediment, generalizing the movement of water and sediment,analyzing the strength during the stream movement,and by using the momentum equation of the water face of sand ripple,a mathematical expression of sand ripple height with the stream movement variation is established.Then associating with the bed-load transport rate,a mathematical expression of bed-load transport rate with the changing of stream intensity is established.The case study results with this expression are consistent with in-situ observed data.So it has theoretical and actual values.