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[1]PAN Shan,HE Zhonghua,CHEN Lihui,et al.Spatiotemporal Evolution Characteristics of Meteorological Drought in Guizhou Province in Recent 50 Years Based on Different Time Scales[J].Research of Soil and Water Conservation,2023,30(03):279-288.[doi:10.13869/j.cnki.rswc.2023.03.033]

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Spatiotemporal Evolution Characteristics of Meteorological Drought in Guizhou Province in Recent 50 Years Based on Different Time Scales

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 30 Number of periods: 2023 03 Page number: 279-288 Column: Public date: 2023-04-10

Title:: Spatiotemporal Evolution Characteristics of Meteorological Drought in Guizhou Province in Recent 50 Years Based on Different Time Scales

Author(s):: PAN Shan¹, HE Zhonghua^1,2,3, CHEN Lihui¹, WANG Maoqiang¹; (School of Geography and Environmental Sciences, Guizhou Normal University, Guiyang 550025; 2.National Engineering Technology Research Center for Karst Desertification Control, Guizhou Normal University, Guiyang 550001; 3.Key Laboratory of Remote Sensing Application of Mountain Resources and Environment in Guizhou Province, Guiyang 550001)

Keywords:: Spatiotemporal evolution; meteorological drought; SPEI; Guizhou Province

CLC:: P426.616

DOI:: 10.13869/j.cnki.rswc.2023.03.033

Abstract:: [Objective]Based on the climatic factor zoning conditions, the spatiotemporal evolution characteristics of meteorological drought in different regions of Guizhou Province at different time scales are analyzed, providing a theoretical basis for drought monitoring and prediction, flood control and disaster relief. [Method] Based on the monthly precipitation and temperature data of 31 meteorological stations in Guizhou Province from 1970 to 2019, the variation characteristics of precipitation and temperature in Guizhou Province were discussed by principal component analysis, based on SPEI Index, the temporal and spatial evolution of meteorological drought in Guizhou Province in recent 50 years was studied. [Results](1)The temperature change of Guizhou Province in recent 50 years gradually increased from east to west, that is, the western region was the extreme and severe temperature change region, the central and eastern regions were the moderate temperature change region, and the southern and northern edges were the mild temperature change region. Precipitation variation in Guizhou Province gradually decreased from west to east, with extreme and severe variation in the west, severe variation in the middle, and mild and normal variation in the east.(2)In Guizhou Province, the moderate change area of meteorological drought intensity in recent 50 years was the largest, followed by the mild change area, and the severe change area was the smallest. With the increase of time and time scale, meteorological drought gradually increased, and the phenomenon of ‘peak-valley' alternated. The period from 1970 to 1985 and 1990 to 2000 were the ‘trough' period of drought, and the period from 1985 to 1990 and 2000 to 2019 were the ‘peak' period of drought.(3)In recent 50 years, the monthly drought frequency in Guizhou is mainly medium-low frequency, mainly occurring in the east, south and north of Guizhou; In the areas with mild and moderate changes, the frequency of drought was the smallest and the amplitude was the largest in 70s, and the frequency of drought was the largest and the amplitude was the second in 10s. The variation of drought frequency in the rest years was relatively small. [Conclusion] The study shows that the climate drought has remarkable time-scale characteristics, and the spatial-temporal evolution of drought is the result of the coupling of climate change, watershed surface and human activities.

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Last Update: 2023-04-10