【摘要】 采用量纲分析方法得到了复式断面渠道中主槽和滩地间表观切应力的基本形式,基于Wormleaton等的实测资料,运用回归分析的方法得出了表观切应力中动量传输系数的计算式.动量传输系数中考虑了滩地与主槽水深比hr、宽度比br等因素的作用,进而采用力的平衡原理,导出了主槽与滩地的流速比与流量比的计算公式,该公式反映了动量传输系数以及主槽的糙率nc和滩地糙率nf等对流速、流量的影响.计算结果与实验室内的试验值以及天然河道的实测值吻合良好.更多还原

【Abstract】 The equation of apparent shear stress is got by a method of dimensional analysis. Based on the experimental data of apparent shear stress given by Wormleaton P R (1983), the momentum transfer coefficient in the equation of apparent shear stress is obtained by regression analysis. The effect of relative water depth and relative width on the momentum transfer coefficient is considered. Velocity and discharge formulas are derived from force balance principle. The influence of momentum transfer coefficient, main channel roughness and flood plain roughness on the velocities and discharges are considered in these formulas. The experimental and field measured data are used to verify these formulas. It is found that the calculated results are in good agreement and are shown the validity of these formulas.更多还原