双拱型溢流堰泄流能力及溢流形态研究

Research on Discharge Capacity and Overflow Pattern of Double Arch Weir

双拱型溢流堰是山区河流治理中采用的景观与防洪功能的复合堰。这种溢流堰在枯水季节通过顶拱和底拱形成两级瀑布景观;而在洪水季节,双拱型溢流堰具有较长的溢流宽度,可以更好地满足泄洪要求。为了研究双拱型溢流堰的水力特性,通过现场调研,采用RNG k-ε湍流模型和VOF模型对双拱型溢流堰的三维流动进行计算,模拟了双拱型溢流堰的沿程水面线,获得了水位流量关系曲线。结果表明:双拱型溢流堰水流形态主要影响因素为堰顶水头和堰拱组合形式。

The double arch weir is a composite weir used in mountain river control that has both landscape and flood control functions.In the dry season,this type of weir forms a two-stage waterfall landscape through the top arches and the bottom arch,and while in the flood season,the double arch weir has a longer overflow width,which can better meet the flood discharge requirements.In order to study the hydraulic characteristics of the double arch weir,based on field investigation,the threedimensional flow of the double arch weir is simulated by the RNG k-εturbulence model and the VOF model.The water surface line of the weir is simulated,and the water level-flow curve is obtained.The results show that the flow pattern of the weir is mainly affected by the head and the combination of weir arches.