The Spatiotemporal Variations in and Propagation of Meteorological, Agricultural, and Groundwater Droughts in Henan Province, China

Huazhu Xue, Ruirui Zhang, Wenfei Luan and Zhanliang Yuan ()
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Huazhu Xue: School of Surveying and Land Information Engineering, Henan Polytechnic University, Jiaozuo 454000, China
Ruirui Zhang: School of Surveying and Land Information Engineering, Henan Polytechnic University, Jiaozuo 454000, China
Wenfei Luan: School of Surveying and Land Information Engineering, Henan Polytechnic University, Jiaozuo 454000, China
Zhanliang Yuan: School of Surveying and Land Information Engineering, Henan Polytechnic University, Jiaozuo 454000, China

Agriculture, 2024, vol. 14, issue 10, 1-28

Abstract: As the global climate changes and droughts become more frequent, understanding the characteristics and propagation dynamics of drought is critical for monitoring and early warning. This study utilized the Standardized Precipitation Evapotranspiration Index (SPEI), Vegetation Condition Index (VCI), and Groundwater Drought Index (GDI) to identify meteorological drought (MD), agricultural drought (AD), and groundwater drought (GD), respectively. Sen’s slope method and Mann–Kendall trend analysis were used to examine drought trends. The Pearson correlation coefficient (PCC) and theory of run were utilized to identify the propagation times between different types of droughts. Cross-wavelet transform (XWT) and wavelet coherence (WTC) were applied to investigate the linkages among the three types of droughts. The results showed that, from 2004 to 2022, the average durations of MD, AD, and GD in Henan Province were 4.55, 8.70, and 29.03 months, respectively. MD and AD were gradually alleviated, while GD was exacerbated. The average propagation times for the different types of droughts were as follows: 6.1 months (MD-AD), 4.4 months (MD-GD), and 16.3 months (AD-GD). Drought propagation exhibited significant seasonality, being shorter in summer and autumn than in winter and spring, and there were close relationships among MD, AD, and GD. This study revealed the characteristics and propagation dynamics of different types of droughts in Henan Province, providing scientific references for alleviating regional droughts and promoting the sustainable development of agriculture and food production.

Keywords: drought propagation; meteorological drought; agricultural drought; groundwater drought; groundwater drought index (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2024
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