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采用3-维非对称型Frank Copula函数结构,构建汛期分期为三分期、边缘分布为P-Ⅲ型分布的分期洪水联合分布.在假定分期设计洪水值的联合重现期等于防洪标准T的前提下,推导基于Frank Copula函数的分期设计洪水频率和防洪标准的关系,解决了分期设计洪水达不到防洪标准和分期频率与年频率不一致的问题,为分期设计洪水、分期汛限水位优化设计提供了一条新思路.
A 3-dimensional asymmetric Frank Copula function is used to construct a staged flood distribution with a period distribution of three periods and a marginal distribution of P-Ⅲ distributions. Assuming that the combined recurrence period of staging flood values is equal to the premise of flood control standard T , The relationship between staged design flood frequency and flood control standard based on Frank Copula function is deduced. The problem that staged design flood can not reach flood control standards and the staging frequency is inconsistent with annual frequency is provided for staged design flooding and staged flood season water level optimization design A new idea.