[1]Wang Sinan,Wang Wenjun,Wu Yingjie,et al.Characteristics of Spatial and Temporal Distribution of Drought in Xilin Gol Based on Effective Drought Index[J].Research of Soil and Water Conservation,2024,31(02):413-421.
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Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
31
Number of periods:
2024 02
Page number:
413-421
Column:
Public date:
2024-03-20
- Title:
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Characteristics of Spatial and Temporal Distribution of Drought in Xilin Gol Based on Effective Drought Index
- Author(s):
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Wang Sinan, Wang Wenjun, Wu Yingjie, Li Wei, Zhang Weijie, Chen Zexun
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(Yinshanbeilu Grassland Eco-hydrology National Observation and Research Station, China Institute of Water Resources and Hydropower Research, Beijing 100038, China)
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- Keywords:
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effective drought index; drought; grassland; drought event; Xilin Gol
- CLC:
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Q948.112
- DOI:
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- Abstract:
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[Objective] The aims of this study are to identify drought events, drought frequency and drought intensity in grassland of Xilin Gol, to understand the meteorological drought field in Xilin Gol, and then to alleviate the environmental and economic problems caused by drought in Xilin Gol. [Methods] The month-by-month observation data of nine meteorological stations in Xilin Gol region from 1969 to 2018 were selected to calculate the effective drought index(EDI). The spatial and temporal patterns of drought in Xilin Gol over the past 60 years were analyzed by combining Mann-Kendall test, empirical orthogonal function(EOF)decomposition and quantitative drought characterization methods. [Results] The annual average EDI index of Xilin Gol region decreased at the rate of 0.029/decade, and the drought trend increased significantly, with an average of 0.5 drought events per year. The frequency of normal occurrences in Xilin Gol ranged from 67.17 to 72.65%, and the frequency of severe droughts ranged from 0.02 to 0.99%, with a large variability in the frequency of different droughts, and the southwest and central regions being the regions with higher drought intensity. Contribution of variances of the previous two major characteristic vectors of Xilin Gol reached up to 52.75% and 14.38%, respectively, and the spatial mode showed a consistent type and southeast-northwest inversion phase type. [Conclusion] EDI index considering effective precipitation has more advantages in revealing the spatiotemporal variation trend of drought in grassland, and can be used to identify the spatiotemporal variation of meteorological drought.