Acta Scientiarum Naturalium Universitatis Sunyatseni ›› 2020, Vol. 59 ›› Issue (4): 33-42.doi: 10.13471/j.cnki.acta.snus.2019.09.22.2019D038

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Empirical diagnostic analysis on spatial and temporal variations ofdroughts in the Pearl River basin, China 

CHEN Zishen1,2   

  1. 1. Xinhua College of Sun Yat-sen UniversityGuangzhou 510520China;
    2. School of Geography and PlanningSun Yat-sen UniversityGuangzhou 510275China
  • Received:2019-09-22 Online:2020-07-25 Published:2020-07-25

Abstract: Based on the multiple time scale index of standardization evaporation(SPEI) in the Pearl River basin from 1961 to 2011, the spatial structure distribution and temporal variation characteristics of drought in the Pearl River basin were analyzed by using the methods of rotating empirical orthogonal function decomposition, trend and mutation tests, wavelet spectral and wavelet global coherence spectral analysis. The results show that: 1) The spatial distribution and temporal variation of drought in the Pearl River basin are significantly different in the past 50 years; the number of drought events has been increasing since the 1970s. The duration and intensity of drought events in the Pearl River basin have increased significantly since the 21st century. 2) According to SPEI's REOF spatial decomposition, the Pearl River basin can be divided into 6 spatial modes, and the load centers are located in the south Guizhou and east Yunnan of the Dongjiang river basin in the north Guangxi, the southeast Guangxi, the southwest Guangxi, and the south Guizhou and the east Yunnan, respectively. There is a general drought trend in each region. The southern Guizhou and eastern Yunnan have become the drought center of the Pearl River basin. 3) The wet-dry variation in six zones has an oscillation period of 2-8 year El Nino variation. Some regions show 11 year and 22 year change periods associated with sunspot activities, and the response of each region to ENSO events is significantly different.

Key words: the Pearl River basin, standardized precipitation evapotranspiration index, spatial and temporal variation of drought, rotation of empirical orthogonal function, wavelet analysis, wavelet global coherence spectrum

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