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本文介绍了一个有趣的泄洪结构(见图),其优点是利用了有利的地形条件。溢洪道和大坝分开,它由两个侧槽式溢洪道组成,然后汇合到一个泄洪槽中。正因为是这样的结构形状,故称为“Y 型溢洪道”。溢洪道无闸控制,泄洪能力为900米~3/秒,相应的坝顶水头为2米。在两所学院的水力学试验室中,按不同比尺进行了水力模型的试验研究,比尺分别为1:100和1:40。两个试验的成果相当一致,其主要的水力特征叙述如下:1.试验表明,断面(3)是发生临界水深处的控制断面(参阅图示)。当流量为900米~3/秒时,断面(3)处的临界水浅 h_(cr)=6.8米,临界流速水头 V_(cr)~2/2g=3.0米。
This article presents an interesting flood relief structure (see figure) that has the advantage of taking advantage of favorable topographical conditions. The spillway, which is separate from the dam, consists of two side channel spillways and then merges into a spillway. Because of this structure, it is called “Y-type spillway.” Spillway without gate control, flood discharge capacity of 900 m ~ 3 / s, the corresponding dam top head of 2 meters. In the hydraulic mechanics laboratory of two institutes, hydraulic model tests were conducted on different scales, with scale ratios of 1: 100 and 1:40, respectively. The results of the two experiments are quite consistent. The main hydraulic characteristics are described as follows: 1. The experiment shows that section (3) is the control section where the critical water depth occurs (see figure). When the flow rate is 900m ~ 3 / s, the critical water depth hc (cr) at the cross section (3) is 6.8m and the critical flow velocity head Vcr ~ 2 / 2g is 3.0m.