兼顾供水的小浪底水库汛前调水调沙对接水位

Research on Water Level of Xiaolangdi Reservoir in WSR Before Flood Season Accompanied with Water Supply Safety

小浪底水库汛前调水调沙期的异重流排沙对接水位不仅决定了水库异重流排沙效果,而且关系到主汛期黄河下游的供水安全。在一定的入库流量条件下,水库排沙比随着对接水位的降低先缓慢增大,当对接水位降低到三角洲顶点高程附近时迅速增大。通过分析黄河下游长时段实际用水情况,建立了供水满足率与需补水量之间的关系式,综合考虑汛前调水调沙的排沙效果和下游供水需求,建议近期小浪底水库汛前调水调沙期异重流排沙的对接水位为219~223 m。

During the water and sediment regulation before flood season of Xiaolangdi Reservoir, the water level of density flow for sediment delivery not only determines the effect of density flow for sediment delivery of the reservoir, but concerns water supply safety of main flood season in the lower Yellow River as well. Under the condition of certain discharge into reservoir, the sediment delivery ratio first increases slowly as the connected water level decreases, and then increases rapidly as the water level reduces to the elevation of delta vertex. Based on the analysis of practical situation of water use during long period of time in the lower Yellow River, the relation between satiety rate of water supply and output of supplying water was established. Comprehensively considering the effect of density flow for sediment delivery and the water supply demand of the lower Yellow River, we suggested that the recent connected water level of density flow for sediment delivery was 219-223 m during the water and sediment regulation before flood season of Xiaolangdi Reservoir.