In this paper, a differential equation of describing the lateral distribution of depth averaged velocity is obtained by simplifying 2d shallow water equations of open channel flow.
通过简化宽浅明渠二维水流运动方程，得到垂线平均流速在横向变化的微分方程序。
According to the longitudinal equation of flow movement in channel bends, the theoretical formula of depth-averaged longitudinal velocity distrbution is established.
根据弯道水流纵向运动方程，提出了弯道水流纵向垂线平均流速计算公式。
An empirical formula of depth-averaged velocity is derived by means of dimensional analysis, and at the same time the characteristics of the variation of bottom current velocity are described.
文中还利用量纲分析，导出了挖槽中心垂线平均流速折减系数的经验公式。
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