玛尔挡水电站泄洪消能试验研究

Experimental Study on Flood Discharge and Energy Dissipation of The Maredang Hydropower Station

玛尔挡水电站具有水头高、流速大、下游水位浅,而其泄洪建筑物布置集中,水舌较为集中入水,泄洪消能问题突出的特点。通过模型实验,提出泄洪洞采用横向扩散式挑坎;溢流堰堰顶高程由3261 m降低为3258 m,溢洪道引渠段底板高程随之由3250 m降低为3247 m,溢洪道孔口尺寸由13 m×14 m改为10.5 m×17 m,溢洪道挑坎均采用曲面贴角窄缝挑坎等措施对泄水建筑物进行优化。模型实验结果表明,优化方案可有效解决原方案死水位不能跨岸、下游河道冲刷严重的问题,满足泄洪消能的要求。

The Mare hydropower station has the characteristics of high water head, large flow velocity and shallow downstream water level, and its flood discharge buildings are concentrated, water tongue is concentrated in water, and the problem of flood discharge and energy dissipation is prominent. Through the model experiment, it is proposed that the spillway tunnel adopts the lateral diffusion type ridge;the overflow dome elevation is reduced from 3261m to 3258m, and the floor elevation of the spillway tunnel section is reduced from 3250m to 3247m, and the spillway orifice size is changed from 13m× 14m. 10.5m×17m;The spillway cantilever adopts the optimization scheme of the measures such as the curved surface and the narrow slit. The experimental results show that the optimization scheme can effectively solve the problem that the dead water level of the original scheme cannot be washed across the river and downstream rivers, and meet the requirements of flood discharge and energy dissipation.