宽窄复式河道水流运动特性的试验研究

在分析水槽试验资料的基础上，首次对宽窄复式河道的滩槽过流能力、断面平均流速、垂线流速及横向分布等水流运动特性进行了研究．研究结果表明，宽窄复式河道的主槽流量随着滩槽宽度比的增大而减小，滩地流量随着滩槽宽度比的增大而增大；水流发生漫滩之后，随着水深的增加，主槽流速先减小后增加，滩地流速不断增加，二者的变化幅度与滩槽宽度比有关；在大部分区域内垂线流速偏离对数分布，主槽一般偏小，滩地偏大；垂线平均流速沿横向分布与一般复式河道相似，但滩槽流速差别减小．

Experiment Study on Characteristics of Water Movement in Compound Channels with Variable Boundary

In compound channels with variable boundary, discharge of channel is largerthanthat of plain. Discharge of channel reduces, and discharge of plain rises with increment of thebreadth ratio of plain and channel. After flood plain, velocities of channel and cross-section decrease first, then increase, but velocity of plain always increases. Vertical distribution offlow. velocity doesn't obey logarithmic law. In general, velocity of channel is smaller, but velocity of plain is larger than calculated result of logarithmic equation.