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根据36年汛期(6～10月)实测洪水系列,按龙羊峡、刘家峡两席设计中规定的运用原则,进行调节计算,分析两水库联合运用后,对下游兰州等断面设计洪水的影响,初步认为:1)汛期多年平均水量减少21.9%;2)各年时段洪水特征值年际问变化规律不受影响;3)洪量频率分布型式由偏态铃形分布趋向于乙字形分布。用同频率地区组成法预估吴堡、花园口等断面的设计洪水,由于受龙羊峡、刘家峡水库影响减少水量范围为:相应千年一遇设计洪水最大5天水量减少4～5.7亿m~3,12天水量减少10～12亿m~3。
According to the measured flood series in 36 years of flood season (June to October), according to the application principles stipulated in the design of the two seats of Longyangxia and Liujiaxia, the adjustment and calculation are carried out to analyze the influence of the design flood of the downstream Lanzhou section after the joint use of the two reservoirs, It is preliminarily believed that: 1) the average annual water volume in flood season decreases by 21.9%; 2) the annual variation of flood eigenvalues in different years is not affected; 3) the distribution of flood frequency tends to be B-shaped by the skewed bell-shaped distribution. By using the same frequency regional composition method to predict the design flood of Wubao and Huayuankou sections, the reduction of water volume due to the influence of Longyangxia and Liujiaxia reservoirs is as follows: The corresponding maximum annual design flood is 5 days, the water volume is reduced by 4 ~ 570 million m ~ 3,12 days to reduce the water 10 to 1.2 billion m ~ 3.