浑源抽水蓄能电站下水库拦排沙系统防沙效果的试验研究

Experimental study on the control effect of sediment blocking and discharge system in the lower reservoir of Hunyuan Pumped Storage Power Station

设置拦排沙系统是缓解抽水蓄能电站泥沙问题的有效方法之一。为验证浑源抽水蓄能电站下水库拦排沙系统的防沙效果,建立了浑源抽水蓄能电站下水库泥沙物理模型,进行了不同频率洪水入库试验。通过比较有、无拦排沙系统的输沙量及悬沙特性,论证了拦排沙系统的拦沙效果,并分析了影响拦沙效果的主要因素。结果表明:不建拦沙坝情况,进入下水库的泥沙直接相关于上游水沙条件,其相关系数大于0.8;修建拦排沙系统后,进入下库沙量明显减少、悬沙粒径细化,拦沙效果与拦沙库淤积情况的相关系数均大于0.7,拦沙库的淤积情况是拦沙效果的主要影响因素,而上游水沙条件的影响较小。

Setting up a sediment blocking and discharge system is one of the effective methods to alleviate the sediment problems in pumped storage power stations.To verify the sediment control effect of the sediment blocking and discharge system in the lower reservoir of Hunyuan Pumped Storage Power Station,physical model experiments were conducted to verify the sediment control effect under different frequency flood inflows.By comparing the sediment transport and suspended sediment characteristics of sediment blocking and discharge systems with and without sediment blocking dam,the sediment retention effects of the two systems were demonstrated,and their influencing factors were further analyzed.The results show that the sediment entering the lower reservoir is directly related to the upstream water and sediment conditions in the absence of a sediment blocking dam,with a correlation coefficient greater than 0.8.After the construction of the sediment blocking dam,the amount of sediment entering the lower reservoir significantly decreases,the suspended sediment particle size is refined,and the sedimentation of the blocking reservoir is the main influencing factor of the sediment interception effect,with correlation coefficients greater than 0.7,while the influence of upstream water and sediment conditions is relatively small.