三门峡水库壅水明流排沙特性分析

Analysis of Sluicing Characteristics of Backwater Flow in Sammenxia Reservoir

利用三门峡水库1964—2006年实测资料,对非汛期53场平水和144场洪水入库壅水明流排沙特性进行了分析,提出了出库含沙量与入库含沙量、水流滞留时间的关系式。分析表明,平水入库时入出库平均含沙量为8 kg/m3和5kg/m3,出库含沙量与黄河调水调沙对下游河道调控含沙量指标要求相差较大;洪水入库时入库平均流量为1 200 m3/s,入出库平均含沙量分别为32 kg/m3和24 kg/m3,其中24%的场次出库含沙量达到黄河调水调沙调控指标要求,2.8%的场次出库流量和含沙量同时达到黄河调水调沙调控指标要求。

In this paper, the field data of Sanmenxia Reservoir in 1964 - 2006, including 53 sets in the non-flood period and 144 sets in flood stor- age, backwater flow flushing was analyzed, and the relationship between the outflow sediment concentration and inflow sediment concentration and retention time were put forward. The results show that the average coneentrations of inflow and outflow in non-flood period, 8 and 5 kg/m3 respec- tively, are lower than the concentrations, 20 - 40 kg/m3 , that is required in the lower reaches of the Yellow River during the water and sediment regulation, and the outflow eoncentrations of 24% floods, with the average discharge 1 200 m3/s and the average concentrations of inflow and out- flow 32 and 24 kg/m3 , are in the scope of the concentration that is required in lower reach of Yellow River during the water and sediment regula- tion. The outflow discharge and corresponding sediment concentration from the reservoir of 2.8% floods are in the range of index in the Yellow Riv- er downstream during the water and sediment regulation.