1961—2022年三明市旱涝急转变化的时空特征

Spatiotemporal Characteristics of Rapid Changes in Drought and Flood in Sanming City from 1961 to 2022

基于日尺度旱涝急转指数(DWAAI),研究了福建省三明市1961—2022年旱涝急转的时空变化特征。结果表明:1961年来,三明市旱涝急转事件强度和范围呈增加趋势,其中,旱转涝事件增加趋势更为显著,其空间分布呈现南多北少的特征;旱涝急转事件全年均有发生,但主要集中在雨日多、雨强大的春季和夏季,其中,旱转涝事件主要发生在夏季,涝转旱事件主要发生在春季,而秋、冬季虽然旱涝急转事件较少,但强度较大。

Based on the daily scale drought/flood transition index(DWAAI),the spatiotemporal variation characteristics of drought/flood transition in Sanming City,Fujian Province from 1961 to 2022 were studied.The results show that since 1961,the intensity and scope of drought/flood events in Sanming City have shown an increasing trend,with the trend of drought/flood events increasing more significantly,and their spatial distribution shows a characteristic of more in the south and less in the north;Drought and flood sudden changes occur throughout the year,but are mainly concentrated in spring and summer when there are many rainy days and strong rainfall.Among them,drought to flood events mainly occur in summer,while flood to drought events mainly occur in spring.Although there are fewer drought to flood sudden changes in autumn and winter,their intensity is relatively high.