云南省暴雨日及短时强降水时空分布特征

分析了1986—2016年云南省暴雨日和2009—2016年短时强降水的时空分布特征,结果发现,云南省暴雨日数呈现出由北向南减少的趋势,大值区集中在滇南地区;云南省短时强降水的极值分布大体上有由北向南、由西向东增大的趋势,其中,大值区主要分布在滇南和滇东的局部地区;云南省年暴雨日数呈现微弱的增加趋势,增幅不显著;短时强降水次数呈现波动中显著减少的趋势。云南省暴雨和短时强降水集中出现在云南的雨季(5—10月),其中7月出现暴雨的日数最多,而8月出现短时强降水次数最多;短时强降水出现时段呈现出了2个波峰状,其中18:00出现次数最多。

Spatial and Temporal Distribution Characteristics of the Rainstorm Days and Short-time Heavy Rainfall in Yunnan

The temporal and spatial distribution characteristics of rainstorm days from 1986 to 2016 and short-time heavy rainfall from 2009 to 2016 in Yunnan Province were analyzed.The results showed that the rainstorm days in Yunnan Province showed a trend of decreasing from noah to south,the large value area concentrated in the southern region;The extreme value distribution of short-time heavy rainfall in Yunnan Province had a trend of increasing from north to south and from west to east.Among them,the large value areas were mainly distributed in the local area in southern and eastern of Yunnan;The rainstorm days in Yunnan Province showed a weak increase trend,and the increase was not significant.The short-time heavy rainfall times showed a significant decrease in the fluctuation.The rainstorm and short-time heavy rainfall in Yunnan Province were concentrated in the rainy season of Yunnan (May to October),Among them,the rainstorm days in July was the most,and the short-time heavy rainfall times occurred most in August.There were two wave peaks in the period of short-time heavy rainfall,and the most frequently appeared at 18:00.