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[1]LIU Yu,Li Wen Qing,Liu Zhao,et al.Spatial and Temporal Evolution Characteristics of the Drought in Weibei Loess Tableland Area Based on SPEI[J].Research of Soil and Water Conservation,2021,28(01):109-117.

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Spatial and Temporal Evolution Characteristics of the Drought in Weibei Loess Tableland Area Based on SPEI

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 28 Number of periods: 2021 01 Page number: 109-117 Column: Public date: 2021-01-10

Title:: Spatial and Temporal Evolution Characteristics of the Drought in Weibei Loess Tableland Area Based on SPEI

Author(s):: LIU Yu^1,2, Li Wen Qing^1,2, Liu Zhao^2,3, Yu Yucong^1,2, You Fenghua^1,2, Yang Zhou ^1,2; (1.School of Water and Environment, Chang'an University, Xi'an 710054, China; 2.Key Laboratory of Subsurface Hydrology and Ecological Effects in Arid Region of Ministry of Education, Chang'an University, Xi'an 710054, China; 3.Institute of Water and Development, Chang'an University, Xi'an 710054, China)

Keywords:: drought; SPEI index; Morlet wavelet analysis; R/S analysis; Weibei loess tableland area

CLC:: P426.616

DOI:: -

Abstract:: Based on the measured data of 10 meteorological stations in the Weibei loess tableland area from 1969 to 2016, the standardized precipitation evapotranspiration indices(SPEI)at different time scales were calculated, and the spatial and temporal evolution characteristics of regional drought were studied by Mann-Kendall test, Morlet wavelet analysis, R/S analysis and other methods. The results show that:(1)the annual and seasonal drought in the Weibei loess tableland area had been increasing in the past 48 years, and it is likely to continue to develop toward aridity in the future;(2)the annual drought had a significant mutation in 1991, while the drought in spring, summer, autumn and winter had a significant mutation in 1996, 2010, 2002 and 1978, respectively;(3)there were obvious short cycles of 4～18 years and long cycles of more than 20 years in spring, summer and autumn, and there were obvious short cycles of 3～11 years and 12～30 years in winter;(4)from west to east, the occurrence frequencies of light drought, medium drought, severe drought and extreme drought showed the distribution patterns of ‘high-low-high-low', ‘gradually increasing', ‘gradually decreasing' and ‘low on both sides of the middle high', respectively; moreover, the frequency of drought from big level to small level was moderate drought, mild drought, extreme drought and heavy drought;(5)the contribution rate of spring drought evolution to annual drought evolution was the largest. These results are helpful to understand the characteristics of regional drought evolution and provide scientific support for hydrologic ecological construction and sustainable development of social economy.

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Last Update: 2021-01-15