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本文扼要叙述了目前广泛采用的多年调节计算理论与方法方面的某些条件性与假定性， 认为应在理论上进一步研究以消除这些条件性与假定性的同时，必须进而简化梯级水库的多 年调节计算方法，以便适应流域规划及初步设计方案比较阶段的需要。 本文根据上游水库进行多年调节以后．不改变下游水库多年平均水量而仅改变下游水库 年迳流量变差系数ＣＶ的原则，提出了计算曲线圆，利用曲线图，结合组合频率变量变差法 的应用，可以非常简便地进行迳流变化不同期时梯级水库的多年调节计算。
This article briefly describes some of the conditions and hypotheses in the theory and method of multi-year adjustment and calculation that are widely used today. It is believed that further studies should be made in theory to eliminate these conditions and hypotheses. At the same time, it is necessary to further simplify the multi-year adjustment of cascade reservoirs Calculation method, in order to adapt to the river basin planning and preliminary design program comparison stage needs. This article according to the upstream reservoir for many years after the adjustment. Without changing the average annual water volume in downstream reservoirs and only changing the coefficient of variation CV of annual discharge of downstream reservoirs, the calculation curve circle, the use of graphs and the application of combined variable variation of frequency variables are proposed, Multi-year adjustment calculation of cascade reservoirs in different periods.