It is incapable for current method to establish the diversion standard when two hydropower stations are constructed synchronously. Hence this paper studied it from the perspective of harmonious allocation with considering the balance between economy and safety. Firstly, the risk estimation model of each diversion system under such condition was established in which the composition theory of regional flood was introduced to calculate the changed flood and the Copula function was adopted to construct its probability distribution. On this basis, with treating the adjacent diversion system as a whole, the allocation model of the diversion standard was established in which the life cycle cost (LCC) was proposed as the evaluation index. Aimed at the minimum of the LCC of the serial diversion system, the optimum diversion standard combination was ascertained. Finally, an engineering case was presented to validate the feasibility and effectiveness of the proposed model. And the study can offer the theoretical basis and technical reference for the control of the construction flood in the development of the cascade hydropower station.
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