【摘要】 基于安徽省15个雨量站1957—2016年的日降水数据,利用主成分分析和系统聚类相结合的技术,对安徽省汛期降水的时空特征进行了分析。结果表明:根据汛期降水量,安徽省可划分为以下4类区域,分别为淮北、淮河沿岸、江淮及江南区域,对应的多年平均汛期降水量分别为591.6、617.0、695.0和883.2mm,且具有淮北少于淮河沿岸,淮河沿岸少于江淮,江淮少于江南的地带性分布规律。淮北和淮河沿岸年汛期降水量无突变,江淮和江南的突变点分别在1968和2007年,且除淮北区域年汛期降水量有轻微的下降趋势外,其他3类区域均有明显增加的趋势。淮北区域汛期降水量主要受10a、4a左右的周期波动影响,淮河沿岸主要受14a、10a、18a左右的周期波动影响,淮河沿岸主要受23a、10a、4a左右的周期波动影响,淮河沿岸主要受28a、5a、10a、13a左右的周期波动影响。更多还原

【Abstract】 Based on the daily precipitation data of 15 meteorological stations in Anhui Province in 1957—2016, the field of precipitation during flood season in Anhui Province was divided into regions. The results show that:Anhui Province was divided into four regions by principal component analysis and hierarchical clustering method, namely the region north of Huaihe River, the region near Huaihe River, the region between Yangtze River and Huaihe River,and the region south of Yangtze River. And the precipitation during flood season of the region north of Huaihe River was 591.6mm which was less than 617.0mm of the region near Huaihe River, and less than 695.0mm of the region between Yangtze River and Huaihe River, and less than 883.2mm of the region south of Yangtze River. The mutation years of precipitation during flood season of the region between the Huaihe River and the Yangtze River and the region south of the Yangtze River in Anhui Province were 1968 and 2007, and there was a significant increase trend in the other three kinds of regions except the region north of Huaihe River. And the Morlet wavelet analysis results show that the precipitation during flood season of the region north of Huaihe River is mainly affected by the periodic fluctuations of 10a and 4a, the precipitation during flood season of the region near Huaihe River is mainly affected by the periodic fluctuations of 14a, 10a and 18a, the precipitation during flood season of the region between Yangtze River and Huaihe River is mainly affected by the periodic fluctuations of 23a, 10a and 4a, the precipitation during flood season of the region south of Yangtze River is mainly affected by the periodic fluctuations of 28a, 5a, 10a and 13a.更多还原