Mathematical statistics method is used to analyze the annual and inter-annual precipitation,and it is proved that 80% of the precipitation centralizes in flood season,the extremely ratio of inter-annual variability is about 4.0.
采用数理统计方法对降水量的年内变化与年际变化进行分析,年内降水比较集中,80%降水量集中在汛期,年际变化的极值比在4.0左右。
参考来源 - 唐山市降水量序列变化规律分析—《南水北调与水利科技》—2010年第1期—龙源期刊网·2,447,543篇论文数据，部分数据来源于NoteExpress
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