越过矩形分流墩的流态及急流自由水面

本文通过理论分析和模型试验研究了越过矩形分流墩的水流流态及墩上游自由水面特性。得到了墩上游水跃旋滚与急流飞越而过之间的界限流态佛氏数判别公式，经验证与试验数据吻合。证明了当急流飞越而过时，佛氏数对墩上游天因次水深的影响微小可忽略不计。并得到了墩上游自由水面受墩高、墩宽的影响范围，以及墩上游水深不受收缩比影响的界限收缩比和无因次水深随墩高比、收缩比的变化规律。

Flow Conditions and Supercritical Flow Surface Caused by a Rectangular Splitting-Flow Dissipator

The property of the flow over a rectangular splitting-flow pier is studied by means of theoretical analysis combined with series of model tests. A formula which distinguishes the condition of hydraulic jump upstream the pier from that of splashing-over is developed and fitted well with the data. When water flow splashing over, Frond number at controll section is proved to be nearly independant of dimension flee water depth and its influence is so small as to be ignored. Those results in testing are achieved as follows;the influential range of the pier-height and pier-wide on the water surface upstream the dissipator; the relation of the critical contracting ratio that does not relate contracting ratio to the relative pier-height and the relation of dimensionless water depth to either the relative pier-height or the contracting ratio.