Agricultural drought recovery characteristics and water requirement for rapid drought recovery in the Huai River Basin, China
Date
2025-04-21
Authors
Liu, Jiaying
Zhu, Yonghua
Lü, Haishen
Ahmed, Naveed
Fu, Yinghao
Xu, Yingying
Chen, Tingxing
Yao, Yiling
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Elsevier B.V.
Abstract
Study region: Huai River Basin.
Study focus: The study aims to analyze the spatiotemporal changes in the occurrence and recovery of agricultural droughts of different degrees in the Huai River Basin through the Standardized Soil Moisture Index (SSMI) and the Weighted Average Precipitation Index (WAPI). It also determines the cumulative precipitation amounts leading to the rapid recovery of agricultural droughts with 1–2 days of additional rainfall. This method is designed to accurately identify the characteristics of drought recovery and the actual effective weighted precipitation required for rapid recovery on a daily scale.
New hydrological insights: The findings indicate that mild and extreme droughts frequently occur in the Huai River Basin. The longer the drought persists, the longer the recovery time. Recovery times in the southern part are the shortest. In the past 33 years, there have been 22 events of rapid recovery from agricultural drought within one day following a period with sufficient cumulative rainfall. On average, each event requires a Weighted Average Precipitation Index (WAPI) of 660 mm based on cumulative rainfall from an earlier time period to facilitate drought recovery within one day of additional rainfall. To rapidly recover from severe drought and more severe drought conditions within two days of heavy rainfall, the corresponding WAPI based on sufficient cumulative rainfall from an earlier time period reach nearly 1000 mm.
Study focus: The study aims to analyze the spatiotemporal changes in the occurrence and recovery of agricultural droughts of different degrees in the Huai River Basin through the Standardized Soil Moisture Index (SSMI) and the Weighted Average Precipitation Index (WAPI). It also determines the cumulative precipitation amounts leading to the rapid recovery of agricultural droughts with 1–2 days of additional rainfall. This method is designed to accurately identify the characteristics of drought recovery and the actual effective weighted precipitation required for rapid recovery on a daily scale.
New hydrological insights: The findings indicate that mild and extreme droughts frequently occur in the Huai River Basin. The longer the drought persists, the longer the recovery time. Recovery times in the southern part are the shortest. In the past 33 years, there have been 22 events of rapid recovery from agricultural drought within one day following a period with sufficient cumulative rainfall. On average, each event requires a Weighted Average Precipitation Index (WAPI) of 660 mm based on cumulative rainfall from an earlier time period to facilitate drought recovery within one day of additional rainfall. To rapidly recover from severe drought and more severe drought conditions within two days of heavy rainfall, the corresponding WAPI based on sufficient cumulative rainfall from an earlier time period reach nearly 1000 mm.
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article
Comments
This article is published as Liu, Jiaying, Yonghua Zhu, Robert Horton, Haishen Lü, Naveed Ahmed, Yinghao Fu, Yingying Xu, Tingxing Chen, and Yiling Yao. "Agricultural drought recovery characteristics and water requirement for rapid drought recovery in the Huai River Basin, China." Journal of Hydrology: Regional Studies 59 (2025): 102396. doi:10.1016/j.ejrh.2025.102396
Rights Statement
© 2025 The Authors. This is an open access article under the CC BY-NC license
(http://creativecommons.org/licenses/by-nc/4.0/).
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Funding
This research was supported by NNSF National Natural Science Foundation of China (Grant Nos. 42471019，42071033 and 41830752).