龙羊峡水库初期蓄水运用期间河道冲淤情况分析

Analysis on Aggradation and Degradation of the River Course During Initial Operational Stage of the Longyangxia Reservoir

龙羊峡水库1986年10月15日到1989年11月底初期蓄水期间,受其蓄水和调节径流的影响,黄河上、中、下游河道的输沙能力降低,淤积加重,三门峡水库蓄清排浑运用作用降低。据实测资料分析,该三年内因水库蓄水年均增加的各河段河道淤积量分别为:上游0.43～0.45亿t;中游龙门至潼关河段0.3亿t;下游0.8～1.0亿t。

During the initial storage period of the Longyangxia Reservoir from October 15, 1986 to the end of November 1989, the sediment transporting capacity of the upper, middle and lower reaches of the Yellow River is reduced, sedimentation becomes worse and the operational function of storing clear water and releasing the muddy of the Sanmenxia Reservoir is also reduced due to the storage and regulation.According to the analysis on the observed data that the average annual aggradation volume at each section within the three-year-storage is 43-45 million tons in the upper reaches, 30 million tons in the Longmen-Tongguan section of the middle reaches, and 80-100 million tons in the lower reaches respectively.