刘家峡水库排沙规律及效果分析

Analysis of Silt Discharge Characteristics and Effect of Liujiaxia Reservoir

利用长系列实测资料分析了洮河异重流运移规律和刘家峡水库低水位拉沙的特点,建立了异重流持续时间的计算公式,较好地指导了水库排沙调度。分析表明:1969—2010年洮河汛期共来沙4.267亿t,通过异重流排沙3.542亿t,低水位拉沙0.430亿t,共计排沙3.972亿t,占总来沙量的93%。同时,对今后刘家峡水库的排沙研究提出了建议:1开展洮河口排沙洞运行初期排沙方案研究;2开展黄河干流异重流测验与研究。

With the analysis of movement law of density current in Taohe River and the characteristics of discharging sediment during the low water level period of Liujiaxia Reservoir and the establishment of calculation formula of density current duration had been used to direct the reservoir operation and the remarkable effect of discharging sediment had been achieved. The outcomes show that during the period of 1969~2010,there are 4. 267 × 108 t sediment has been discharged from Liujiaxia Reservoir in which 3. 542 × 108 t sediment with density current and 0. 430 × 108 t sediment with discharging sediment in low water level making up 93% of total amount sediment which coming from Taohe River during flood seasons. And advices about research of Liujiaxia Reservoir sediment discharging was proposed:a)The Sediment discharge plan during early operating period of desilting tunnel at Taohe River entrance should be researched;b)Density current in the Yellow River main stream measurement and research should be carried out.