关键词: 消力戽, 波动特性, 概率密度, 物理模型试验, 山区性河道

Abstract: In order to study the fluctuation characteristics of surface water in the downstream river after bucket flow energy dissipation, based on the 1:60 physical model of an project, the multi-function data acquisition system called DJ800 was used to simulate the fluctuation characteristics of the surface water in different flow regimes (free bucket flow, attached bucket flow, critical bucket flow and submerged bucket flow). Wave parameters such as height, period, length, velocity and probability density were analyzed. Research results showed that surge significantly attenuated in the range of x/D<20, the subsequent attenuation obviously slowed down. The wave length, velocity, period of submerged bucket decreased compared with other bucket flows. For the submerged bucket, the channel plane bend has a limited effect on wave attenuation, so the wave propagation is far. The fluctuation in different bucket flows is mainly in the range of ±3σ, which basically accords with the normal distribution. The research results can provide reference for the wave protection design of similar project.

Key words: energy dissipation bucket, wave characteristics, probability density, physical model test, mountainous river