沙波阻力问题的研究

根据前人及作者的分析,沙波阻力取决于泥沙运动相对强度φ′;水流福氏数Fr;水流雷诺数Re;沙粒沉降雷诺数Rew和河床相对糙率D_(50)/Rb。根据420组水槽试验资料的回归分析,获得了沙波阻力关系式。回归方程与试验资料相比,相关系较达0.98;同黄河、长江和渭河的现场资料相比,也能很好地相符,用其计算平均流速能够得到满意的精度。

Study on the Resistance of Sand Waves for Alluvial Bed

According to analysis by predecessors and authors, the resistance of sand waves (ripples, dunes, etc.) depends on the relative intensity of movement of the bed material Ψ', flow Froude number Fr, flow Reynolds number Re, fallingvelocity Reyonlds number Rew and relative roughness of riverbed D50/R_b. The resistance relations of sand waves was obtained according to regression analysis with 420 sets of data obtained in the laboratorial experiments with correlation coefficient r =0.98 Comparing regression equation with field data for the Yellow River, the Yangtze River and the Weihe River, it is also in agreement. Good results can be obtained to calculate average water velocity with it.