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| DOI：10.13522/j.cnki.ggps.2023256 |
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| Calculating spatiotemporal variation in droughts in the Huaibei area using the precipitation-evapotranspiration index |
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CHEN Yu, ZHANG Qibing, LYU Haishen, CHEN Xiaofeng, LI Jie, JIANG Xinping, WANG Zhenlong
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1. Hohai University, Nanjing 210098, China;
2. Wudaogou Hydrology Experimental Station, Hydraulic Research Institute of Anhui Province, Hefei 230088, China
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| Abstract: |
| 【Objective】Drought is an abiotic stress detrimentally affecting crop production in many countries. Understanding its occurrence in a region is crucial to improving its water and agricultural management. In this paper, we analyzed the spatiotemporal variation in drought from 1961—2022 in Huaibei located in central China.【Method】The analysis is based on meteorological data measured from 1961—2022 from 21 weather stations across the region. Monthly, seasonal, and annual standardized precipitation evapotranspiration index (SPEI) in each station were calculated, from which we calculated the spatiotemporal variation in drought across the region.【Result】① Monthly, seasonal and annual SPEI in Huaibei had been in decrease from 1961—2022. ② The frequency and duration of persistent droughts had both been in increase from 1961—2022, with Huaibei station showing the highest drought frequency at 0.73 times/year, and Sixian station showing the longest drought duration at 4.61 months. ③ Annual change in droughts in spring and autumn did not show any identifiable trend. Frequency and intensity of droughts in winter were the highest, reaching 34.43% and 21.86%, respectively. Spatially, spring drought was more frequent in the center, east, and southwest of the region; summer drought was less frequent in the southeast of the region; autumn drought was more frequent in the east and north of the region; winter drought was more frequent in the west, northeast and southeast of the region. ④ On average, annual change in drought was increasing at a rate of 0.01/10 a, but not at significant levels. Drought areas had been in increase from 1961 to 2022 at a rate of 1.4%/10 a. The north has a high tendency for occurrence of droughts, while drought intensity tends to be high in the west and southeast of the region. Drought is more frequent in the northeast and southwest.【Conclusion】Overall, there are noticeable trends in spatiotemporal variation in drought in the Huaibei region, with drought frequency and intensity varying between different regions and showing an increase trend from 1961 to 2022. |
| Key words: standardized precipitation evapotranspiration index; meteorological drought; drought characteristics; Huaibei area |
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