利用水库沉沙减小过机泥沙的分析研究  

Analysis and Study on Sediment Reduction by Reservoir Sedimentation

作　　者：刘娜[1] 高敏 毕小剑[1] 陈天恩 LIU Na;GAO Min;BI Xiaojian;CHEN Tian'en(Powerchina Northwest Engineering Corporation Limited,Xi'an 710065,China)

机构地区：[1]中国电建集团西北勘测设计研究院有限公司,西安710065

出　　处：《西北水电》2020年第S01期11-14,21,共5页Northwest Hydropower

摘　　要：通过不同的水库排沙运行方式,将设沉沙池方案及水库沉沙方案进行对比分析,水库沉沙方案利用坝前段的水库进行沉沙,在汛期对淤积床面进行冲刷,保持沉沙库容,降低库内流速,增加泥沙沉降,改善过机泥沙问题。通过沉沙计算与冲刷计算,研究2个方案的沉沙效果,以及水库沉沙方案的敞泄冲刷的时机与频次,对过机含沙量、机组抗磨措施、检修周期、发电量进行综合分析,表明水库排沙运行方式的可行性,并分析其在经济方面也具有优势,可为其它工程提供借鉴。Through different operation modes of sediment discharge in reservoirs,the proposal of setting sediment pool and the proposal of sediment discharge in reservoirs are compared and analyzed.The proposal of sediment discharge in reservoir uses the reservoir in front of the dam to settle sediment,scour the silting bed surface in flood season,maintain the capacity of sediment discharge,reduce the flow rate in the reservoir,increase sediment settlement,and alleviate the problem of sediment concentration in the units.By desilting and scouring calculation,this paper studies the desilting effects of two proposals,as well as the frequency and timing of discharging and scouring of the reservoir desilting proposal,and analysis comprehensively the sediment concentration in the unit,unit anti-wear measures,unit maintenance cycle,and the energy output.The analysis shows the feasibility of the operation mode of reservoir sediment delivery,finds out that the operation mode of reservoir sediment delivery is superior in terms of economic cost and provides reference for other similar projects.

关 键 词：过机含沙量 工程泥沙 机组运行周期 经济比较 

分 类 号：TV145[水利工程—水力学及河流动力学]