Wang et al. (2026) Drivers, dynamics, and cascading effects of phased drought-flood abrupt alternation on basin water quality

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Identification

• Journal: Journal of Hydrology
• Year: 2026
• Date: 2026-07-22
• Authors: Zhenxiong Wang, Xiaoyan Bai, Jiefeng Wu, Yulei Xie, Zhenxing Zhang
• DOI: 10.1016/j.jhydrol.2026.136078

Research Groups

• Lijiang River Basin Research Group, Guangxi University
• Water Quality Management Laboratory, Chinese Academy of Sciences
• Climate Change Research Institute, Southern China Normal University

Short Summary

This study investigates the dynamic impacts of drought-flood abrupt alternation (DFAA) events on river water quality in Southern China's Lijiang River Basin using a multiscale multifactor standardized index. The results reveal significant changes in water quality parameters during DFAA events.

Objective

• Investigate the cascading effects and dynamic impacts of DFAA events on river water quality in the Lijiang River Basin

Study Configuration

• Spatial Scale: Regional scale (Lijiang River Basin, Southern China)
• Temporal Scale: Monthly time step from 2006 to 2018

Methodology and Data

• Models used: Multiscale Multifactor Standardized DFAA Index (MSDFI)
• Data sources: Satellite remote sensing data, in-situ measurements, and reanalysis datasets

Main Results

• pH and DO levels were elevated during droughts but decreased during floods, while COD Mn showed the opposite trend.
• NH 3 -N concentrations exceeded normal levels in both drought and flood periods.
• pH and DO demonstrated linear variation patterns across different phases of DFAA events.
• COD Mn and NH 3 -N exhibited phase-integrated response patterns throughout the DTF process.

Contributions

• This study provides valuable scientific insights into the dynamic changes in water quality and their driving forces during DFAA events, which is essential for formulating targeted water quality management strategies and enhancing the resilience of river ecosystems in the context of climate change.
• The research highlights the importance of considering the cascading effects of DFAA events on river water quality.

Funding

• National Natural Science Foundation of China (Grant No. 51879006)
• Guangxi Science and Technology Major Project (Grant No. 2018AB01001)

Citation

@article{Wang2026Drivers,
  author = {Wang, Zhenxiong and Bai, Xiaoyan and Wu, Jiefeng and Xie, Yulei and Zhang, Zhenxing},
  title = {Drivers, dynamics, and cascading effects of phased drought-flood abrupt alternation on basin water quality},
  journal = {Journal of Hydrology},
  year = {2026},
  doi = {10.1016/j.jhydrol.2026.136078},
  url = {https://doi.org/10.1016/j.jhydrol.2026.136078}
}