Drought Characteristics Evolution in Guizhou Province Based on SPI
LI Changjiang
BO Yanping
AN Meiyun
PENG Yun
Abstract：This study analyzes 62 years of rainfall series data from 65 meteorological stations in Guizhou Province from 1961 to 2022.Utilizing on the standardized precipitation index(SPI),comprehensive assessment of the drought characteristics in Guizhou Province is conducted,elucidates the spatiotemporal distribution characteristics and evolution trends of drought,and providing decision-making basis for drought disaster forecasting,early warning,disaster prevention and reduction.The results show that the drought incidence rate in the province is 91.9%,with an average drought frequency of 19.4 station times per year.Drought conditions are mainly mild and moderate.The drought prone areas in the province are mainly concentrated in Luodian,Libo,Dushan,Duyun,Congjiang,Rongjiang,Danzhai,Leishan,Kaili,Taijiang and other regions in southern and southeastern Guizhou.The drought tendency rate in the province is 0.117,showing an overall upward trend year by year.According to the results of wavelet analysis,there are several time scales of oscillation periods for drought in the province,specifically at 5-year,11-year,20-year,and 37-year intervals.Notably,the strongest oscillation occurs in the 37a period,which is the first main period of drought in the province.
Keywords：Guizhou Provincedrought characteristicsspatiotemporal distributionevolutionary trend
Publication Date：2025-02-27
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：7( 82-88 )