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在水电站设计中,需要确定动能效益最优的水库消落深度。然而动能效益最优包含着两个方面的内容:其一是指容量效益最优,即要求水库消落深度能使保证出力最大,这个消落深度可以称为最优容量消落深度,用h_n″表示,相应的调蓄库容为最优容量调蓄库容,用Vn″表示;其二是指替代能量效益最优,即要求水库消落深度能使年平均发电量最大,这个消落深度被称为水库常年工作深度,用h_n″表示。一般说h_n″小于h_n″。
In the design of hydropower station, it is necessary to determine the depth of the dam that has the best kinetic energy benefit. However, the optimal kinetic energy benefits include two aspects: one is the optimal capacity and efficiency, which means that the depth of the reservoirs can ensure the maximum output, which can be called the optimal capacity decline depth, h_n “Said that the corresponding storage capacity of the storage capacity for the optimal capacity, with Vn” said; second is the best alternative energy efficiency, which requires that the depth of the reservoir depth can make the largest average annual power generation, the depth was Known as the reservoir perennial work depth, with h_n “said generally h_n” less than h_n ".