通过收集和整理1644~1911年珠江流域旱涝灾害历史文献资料,利用受灾县次划分旱涝等级法重建268a来的旱涝等级序列。并运用滑动平均、累积距平、EEMD、IDW等方法分析旱涝序列的时空特征。结果表明:清代1644~1911年珠江流域旱涝灾害频发,且涝灾的频次略多于旱灾,可以将1644~1911年珠江流域旱涝灾害划分为3个偏旱期和2个偏涝期,旱涝变化存在年际(准2 a、准5 a)、年代际(准10 a、准24 a和准54 a)和准世纪际(准134 a)上的3类变化周期。清代珠江流域旱涝灾害的受灾县次比在空间上存在明显的差异性,总体上洪涝灾害多于干旱灾害。珠江流域各府(州)的干旱灾害空间分布不均匀,整体上由东向西递减,洪涝灾害的频次空间分布上具有区域相连性,主要集中广东、江西两省以及云南省中部地区。
Through the collection and collation of the historical literature on drought and flood disasters in the Pearl River Basin from 1644-1911,the drought and flood level sequence of 268 a was reconstructed by the affected county. The temporal and spatial characteristics of the drought and flood sequence were analyzed by means of sliding average,cumulative anomaly,EEMD and IDW. The results show that the droughts and floods in the Pearl River Basin were frequent in the Qing Dynasty from 1644-1911,and the frequency of disasters was slightly more than that of droughts. The droughts and floods in the Pearl River Basin from 1644 to 1911 can be divided into three drought periods and two hemiplegia periods: 2 a and 5 a for the interannual change,10 a and24 a for the interdecadal change,as long as 134 a for the century change. In the Qing Dynasty,the flood-stricken disasters in the Pearl River Basin have obvious differences in spatial ratios,and overall flood disasters are more than drought disasters. The spatial distribution of drought disasters in the Pearl River Basin is uneven,and the overall decline from east to west. The frequency distribution of flood disasters is regionally connected,mainly in Guangdong,Jiangxi and central Yunnan.
Resources and Environment in the Yangtza Basin
Pearl River Basin
temporal and spatial characteristics