Spatial and Temporal Evolution Characteristics of Extreme Precipitation in Henan from 1960 to 2020
Global warming has accelerated the hydrological cycle leading to frequent extreme precipitation events,increased urban drainage loads and flood risks,and affected the temporal and spatial characteristics of regional climate.In this pa-per,the spatial and temporal evolution characteristics of nine extreme precipitation indices in Henan Province were analyzed by the methods of trend analysis,Kriging interpolation,M-K mutation analysis,Morlet wavelet transform and Spearman correlation coefficient based on the administrative division of Henan Province,and 26 rainfall stations were evenly selected in the region for the 61 years period from 1960 to 2020.The results show that the annual precipitation in Henan Province is on an increasing trend,the extreme precipitation events are on a decreasing trend,and the overall climate of Henan Prov-ince is gradually becoming wetter.Extreme precipitation indices in Henan Province have significant spatial differences,and the risk of extreme precipitation is significantly greater in the southeast than in the northwest.Except for precipitation inten-sity,maximum number of consecutive precipitation days and 1-day maximum precipitation,the indices have good correla-tion with annual precipitation,flood season and monthly precipitation from June to September,which is a good guideline for assessing annual precipitation and its intra-annual distribution characteristics,and frequency of extreme precipitation events.The results indicate that precipitation evolves from high intensity in short duration to low intensity in long duration,and the risk of such extreme precipitation in long duration should be addressed by realizing a shift in the thinking of flood control from improving the capacity to drain large amounts of water in short periods to absorbing precipitation in low intensity in long periods.
extreme precipitationHenan Provincetrend analysiscorrelation coefficientspatial and temporal evolution
万方数据
维普
