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1方法的基本概念水文要素随时间变化的过程尽管是多样的，但总可以把它看成有限个不同周期的周用波相互重迭的过程。其数学模型为：式中：x(t)─—某水文要素序列；P1（t）─—第i个周期波序列；─—误差（也称残差）项。根据某水文要素数据，分析出该要素所含有的周期，而且这
The basic concept of a method Although the process of hydrological elements over time, although diverse, can always be regarded as a finite number of different cycles of the week-wave overlapping process. The mathematical model is: Where: x (t) ─ ─ a hydrological factor sequence; P1 (t) ─ ─ i-th periodic wave sequence; ─ ─ error (also known as residuals) term. According to a hydrographic data, the analysis of the elements contained in the cycle, and this