黄河龙羊峡水库进出库水沙输移特性

摘要

根据龙羊峡水库进出库控制站的水沙实测资料，借助变差系数、偏态系数、Pearson相关分析和回归分析等方法，分析了进出库水沙的输移特性。结果表明：水库建设期年际径流量差和输沙量差波动明显，差异显著，出库水沙量大于进库的；水库蓄水运用对进出库水沙量的影响显著，进出库年均标准化径流量、标准化输沙量均呈下降趋势；龙羊峡水库蓄水运用后出库径流量的年内分配趋于均匀化，汛期径流量减小，非汛期径流量增大；进出库径流量和输沙量具有明显的正相关性，单位径流条件下出库的产沙动力高于进库的，相同径流条件下进库输沙量在水库蓄水运用后呈增大趋势。%We made use of vast methods to display the runoff and sediment discharge transport characteristics of inflow and outflow of Longyangxia Reservoir,such as coefficient of variation,skewness coefficient,Pearson correlation analysis and regression analysis. The results are as follows:the difference is significant to annual runoff gap and sediment discharge gap between outflow and inflow during the construction period. The reservoir’s impounding produces a significant effect on the standard runoff and sediment discharge of inflow and outflow,which trends to decline after the Longyangxia Reservoir’s impounding. The distribution of runoff of outflow homogenizes during the year,which presents by the decreases during flood season and increase during the non-flood season. There is a positive correlation between runoff and sediment discharge of Longyangxia Reser-voir’s inflow and outflow. The sediment yield of outflow is higher than the inflow upon unit runoff. The sediment discharge of inflow after the im-pounding of Longyangxia Reservoir is higher than that of before.