弯曲河道纵向垂线平均流速平面分布的研究

A Study on the Distribution of the Depth-averaged Longitudinal Velocity in Channel Bends

本文以弯道水流运动方程作为分析的基础，根据弯道水流纵向流速沿垂线分布在凸岸区域眼从对数分布律，在四岸区域眼从抛物分布律，导出了分区域变自率动床弯道水流纵向垂线平均流速计算公式，并从理论上对河湾纵向垂线平均流速的横向分布和沿程变化规律进行了分析，同时给出了适用于定半经弯道的纵向垂线平均流速平面分布公式的简化形式。最后采用美国ＦａｌｌＲｉｖｅｒ野外水流观测资料对纵向垂线平均流速计算公式进行了验证计算，结果令人满意。

It is important to Understand the laws of the distribution of the depth-averaged longitudinal velocity of curved flow when designing a canal or a river improvement scheme. In this paper, the motion equations of curved flow are regarded as the analytical basis, considering the distribution of the longitudinal velocity follows a logarithmic law in the inner bank region and does a parabolic law in the outer bank region, the calculation formal of the depth-averaged longtudinal velocity are deduced in the different regions for variable curvature mobile bed channel bends. The laws of the depth-averaged longitudinal velocity are analyzed and its simplified forms are given. The results of computation are in good agreement with that of measurement on the Fall River, in America.