| 引用本文: | 陈 雨,章启兵,吕海深,等.基于SPEI指数的淮北地区气象干旱时空特征研究[J].灌溉排水学报,2024,43(2):67-77. |
| CHEN Yu,ZHANG Qibing,LYU Haishen,et al.基于SPEI指数的淮北地区气象干旱时空特征研究[J].灌溉排水学报,2024,43(2):67-77. |
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| 摘要: |
| 【目的】研究淮北地区1961—2022年气象干旱时空特征。【方法】采用淮北地区21个站点1961—2022年实测气象资料，计算月、季、年尺度各站点及区域平均标准化降水蒸散指数（SPEI），分析该区干旱发生频次、干旱趋势及干旱发生强度时空变化特征。【结果】①1961—2022年淮北地区月、季、年尺度SPEI呈下降趋势。②月尺度干旱场次及干旱平均持续时间呈逐年上升趋势，淮北站年均干旱场次最多（0.73次/年），泗县站干旱平均持续时间最长（4.61 月/次），淮北站月尺度干旱风险最高。③春季、秋季呈不显著干旱化趋势，夏季、冬季呈不显著湿润化趋势；冬季干旱频率和干旱发生强度最高，分别为34.43%、21.86%；夏季局域性及其以上干旱频率最高；冬季全域性及其以上干旱频率最高；中东部及西南部春季干旱频率较高，东南部夏季干旱频率较低，东部和北部秋季干旱频率较高，西部和东北部、东南部边缘地区冬季干旱频率较高。④年尺度淮北地区呈不显著干旱化趋势（-0.01/10 a），干旱站次比逐年增加（1.4%/10 a）；北部干旱化倾向较高，西部及东南部干旱发生强度较高，东北部及西南部干旱频率较高。【结论】淮北地区整体呈干旱化趋势，区域间干旱频率、干旱发生强度差异明显。 |
| 关键词: 标准化降水蒸散指数；气象干旱；干旱特征；淮北地区 |
| 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 |
