Agricultural drought recovery characteristics and water requirement for rapid drought recovery in the Huai River Basin, China

IF 5 2区地球科学 Q1 WATER RESOURCES Journal of Hydrology-Regional Studies Pub Date : 2025-06-01 Epub Date: 2025-04-21 DOI:10.1016/j.ejrh.2025.102396

Jiaying Liu , Yonghua Zhu , Robert Horton , Haishen Lü , Naveed Ahmed , Yinghao Fu , Yingying Xu , Tingxing Chen , Yiling Yao

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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.

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淮河流域农业干旱恢复特征及快速恢复需水量

研究区域：淮河流域。通过标准化土壤水分指数（SSMI）和加权平均降水指数（WAPI），分析淮河流域不同程度农业干旱发生与恢复的时空变化特征。它还决定了累积降水量，导致农业干旱在1-2天的额外降雨下迅速恢复。该方法能够在日尺度上准确识别干旱恢复特征和快速恢复所需的实际有效加权降水。研究结果表明，淮河流域经常发生轻度和极端干旱。干旱持续的时间越长，恢复的时间就越长。南部地区的恢复时间最短。在过去的33年里，有22次农业干旱在累积降雨充足的时期后一天内迅速恢复。平均而言，每个事件需要一个660 毫米的加权平均降水指数（WAPI），该指数基于较早时期的累积降雨量，以促进在一天的额外降雨中恢复干旱。为了在强降雨的两天内迅速从严重干旱和更严重干旱中恢复过来，基于前期充足累积降雨量的相应WAPI接近1000 mm。

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来源期刊

Journal of Hydrology-Regional Studies Earth and Planetary Sciences-Earth and Planetary Sciences (miscellaneous)

CiteScore

6.70

自引率

8.50%

发文量

284

审稿时长

60 days

期刊介绍： Journal of Hydrology: Regional Studies publishes original research papers enhancing the science of hydrology and aiming at region-specific problems, past and future conditions, analysis, review and solutions. The journal particularly welcomes research papers that deliver new insights into region-specific hydrological processes and responses to changing conditions, as well as contributions that incorporate interdisciplinarity and translational science.