一、引言虹吸溢洪道是利用虹吸原理泄放坝上游多余水量的一种泄洪建筑。它通过一定的措施,可在上下游水位差的作用下使虹吸管通道全部充水,自动宣泄流量。当上游水位由高峰下降到特定高程的通气孔以下时,虹吸因进气而自动破坏,停止泄流。其主要优点是:省去堰顶闸门,节省投资;能自动发动和自动断流,管理简单;与相同堰顶水头的溢流堰相比,泄量 I. INTRODUCTION Siphon spillway is a type of spillway building that utilizes the principle of siphon to release excess water in the upper reaches of the dam. Through certain measures, it can make all the water in the siphon channel filled with water under the effect of the water level difference between the upper and lower reaches, and automatically release the flow rate. When the upstream water level drops below a certain elevation from the peak to the vent, the siphon is automatically destroyed by the intake air and the discharge is stopped. Its main advantages are: save the weir roof gate, save investment; can automatically start and automatically cut off, simple management; with the weir at the top of the weir crest weir, discharge