多年平均值的主周期为32天，次周期为17天。
The primary period of normals is 32 days and its subperiod is 17 days.
方向的主周期是年周期变化、半年周期变化、51天和609天的周期变化。
For Z direction, the principal periods are annual, semi-annual, 51-day and 609-day periods.
本文在原有定性分析方法的基础上，提出基于年径流时间序列主周期小波系数加权求和预测周期成分的年径流预测模型。
Based on the primary qualitative method, we propose an annual runoff prediction model using weighted sum of wavelet coefficients of major periods to predict the periodic components.
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