[1]YANG Xingxing,YANG Yunchuan,TIAN Yi,et al.Characteristics of Spatiotemporal Distribution of Rainfall-Deficient Flash Drought in Guangxi[J].Research of Soil and Water Conservation,2020,27(02):149-157.
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Characteristics of Spatiotemporal Distribution of Rainfall-Deficient Flash Drought in Guangxi
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
27
Number of periods:
2020 02
Page number:
149-157
Column:
Public date:
2020-03-30
- Title:
- Characteristics of Spatiotemporal Distribution of Rainfall-Deficient Flash Drought in Guangxi
- CLC:
- S423; P429
- DOI:
- -
- Abstract:
- In order to study the characteristics of rainfall deficient type sudden drought in humid areas, Guangxi was selected as the study area. Based on the analysis of the evolution of rainfall-deficient flash drought, we analyzed the characteristics of spatiotemporal distribution of the drought in Guangxi from 1979 to 2015 by using Mann-kendall,Hurst,BG,EEMD. The results show that:(1)this type of flash drought in the early stage of the drought, soil moisture is obviously low, in the course of the drought, evapotranspiration, solar radiation, temperature and other factors are significantly correlated; after the occurrence of the drought, soil moisture will continue to be low for 5～25 days;(2)it occurs at the frequency of 1.0%～2.0% in Guangxi, the area is mainly concentrated below 10%, the duration is 5～10 days, which often occurs in summer and lasts for a long time;(3)it had shown the significant downward trend from 1979 to 2015, the frequency was a period of 3.45-year and had a mutation in 1999;(4)the frequency of flash drought is higher in southern Guangxi and the duration of flash drought is longer in southwestern Guangxi, while the frequency and duration of sudden drought show the significant downward trend in central Guangxi;(5)the frequency of simultaneous occurrence of flash drought and seasonal drought in the region are between 6% and 15%. These results can provide reference for improving the early warning of drought in Guangxi.
- References:
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Last Update:
2020-02-25