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中文摘要：
合理的流域汛期分期，对水库防洪、兴利和实现洪水资源安全利用具有关键意义。现有汛期分期方法较复杂，计算繁琐，不便于应用。为此提出了基于集对原理的汛期分期方法——集对分析法（SPAM）。介绍了集对分析的基本思路和汛期分期计算的步骤。实例分析表明基于集对分析的汛期分期可行，分期结果可信。SPAM概念清晰，结构简单，计算简洁，易操作，是一种有效的分期途径。
英文摘要：
The valid division of flood period is more important for flood control, water use and security utilities of flood resources, tne usual methods of division of flood period are complicated for mathematic theories and difficult to calculate. In this paper a new approach, set pair analysis method （SPAM） has been presented. The basic idea of set pair analysis and the calculation steps of SPAM are discussed. The case study of the division of flood period has shown that the SPAM is feasible. The SPAM is a satisfactory approach to division of flood period whose concept and structure and calculation are simple and clear.
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