Abstract: The hydraulic characteristics of curved conduit flow arc one of the most interesting subjects to hydraulic researchers. Among them the longitudinal depth averaged velocity distribution is an important topic. A generalized curved conduit flow experiment was employed to obtain the longitudinal velocity parameters by adopting the ADV to measure the 3D flow velocity data. Based on the calculation methods of water surface transverse gradient and longitudinal gradient in curved flow, a longitudinal depth averaged veloeity distribution formula was theoretically established to explore the bend flow charaeteristics. Results show that the calculated data agree well with the measured ones, which provides a theoretic basis to explore the hydraulie characteristics profoundly

Key words: hydraulics , curved conduit flow , longitudinal velocity , depth averaged , velocity distribution ;

摘要： 弯道水流特性是水利界感兴趣的重要研究课题。而弯道水流纵向垂线平均流速的分布则是其重要内容。运 用弯道水流概化模型试验,利用先进的ADV进行了三维流速数据的采集,从中提取了纵向流速参数。基于作者提 出的弯道水面横比降与纵比降的沿程分布公式,经理论推导得到了弯道水流纵向垂线平均流速分布的计算公式。 研究表明,公式与实测资料吻合良好,为进一步深入探讨弯道水流特性奠定了理论基础。

关键词: 水力学, 弯道水流, 纵向流速, 垂线平均, 流速分布