Li et al. (2025) Spatiotemporal Dynamics and Lagged Hydrological Impacts of Compound Drought and Heatwave Events in the Poyang Lake Basin

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Identification

• Journal: Hydrology
• Year: 2025
• Date: 2025-12-30
• Authors: Ningning Li, Yang Yang, Zikang Xing, Yi Zhao, Jianhui Wei, Miaomiao Ma, Xuejun Zhang
• DOI: 10.3390/hydrology13010016

Research Groups

Not explicitly stated in the provided text.

Short Summary

This study investigates the characteristics and hydrological impacts of Compound Drought and Heatwave (CDHW) events in China's Poyang Lake Basin from 1981 to 2016, revealing a significant post-2000 increase in CDHW frequency, severity, and intensity, which substantially enhances hydrological drought risk through a robust, lagged influence primarily driven by the heatwave component.

Objective

• To investigate the characteristics and hydrological impacts of Compound Drought and Heatwave (CDHW) events in the Poyang Lake Basin, China.

Study Configuration

• Spatial Scale: Poyang Lake Basin, China.
• Temporal Scale: 1981 to 2016 (36 years); daily data; lagged hydrological impacts peaking at 40–90 days.

Methodology and Data

• Models used: Standardized Precipitation Index (SPI), Standardized Temperature Index (STI), daily rolling-window approach, Event Coincidence Analysis (ECA).
• Data sources: Not explicitly stated, but implies daily precipitation, temperature, streamflow, and lake water level data.

Main Results

• A paradigmatic shift in the CDHW regime occurred post-2000, marked by statistically significant increases in frequency, severity, and intensity, and fundamental alterations in their statistical distributions.
• Intensified CDHW events significantly enhance hydrological drought risk.
• A robust and increasing lagged influence of CDHW on hydrological drought was observed, peaking at 40–90 days (seasonal timescales).
• The protracted hydrological impact of CDHW is predominantly attributed to the heatwave component, which imposes prolonged hydrological stress, in contrast to the more immediate but rapidly decaying influence of drought alone.

Contributions

• Quantifies the spatiotemporal evolution and cascading impacts of CDHW on hydrological processes in a monsoonal lake basin, an area previously poorly quantified.
• Highlights the critical necessity of integrating compound extremes and their non-stationary, lagged impacts into water resource management and climate adaptation strategies for monsoonal basins.

Funding

Not explicitly stated in the provided text.

Citation

@article{Li2025Spatiotemporal,
  author = {Li, Ningning and Yang, Yang and Xing, Zikang and Zhao, Yi and Wei, Jianhui and Ma, Miaomiao and Zhang, Xuejun},
  title = {Spatiotemporal Dynamics and Lagged Hydrological Impacts of Compound Drought and Heatwave Events in the Poyang Lake Basin},
  journal = {Hydrology},
  year = {2025},
  doi = {10.3390/hydrology13010016},
  url = {https://doi.org/10.3390/hydrology13010016}
}