本文根据矩形水槽试验，表明：对于整个断面的各垂线流速分布可划分为底部内区、外区和表面区。
Result of test in rectangular sluice shows that vertical velocity distribution profile may be divided into bottom inner, outer and surface zone.
底部内区流速分布可用对数公式表示；外区和表面区可用二次抛物线公式表示。
Velocity distribution can be expressed by a logarithmic formula for the inner zone and a parabolic formula for outer and surface zones.
说明底部有一个“作用流速”，才产生底床的冲刷与淤积。
It is assumed that there is an "effective bed velocity" on the bottom which determines the erosion and deposition of the bed.
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