Qian et al. (2026) Separating typhoon and non-typhoon rainfall reveals structural hydrological regime shifts in coastal-to-inland basins

Identification

• Journal: Journal of Hydrology
• Year: 2026
• Date: 2026-06-29
• Authors: Xiaojuan Qian, Sangyoung Son
• DOI: 10.1016/j.jhydrol.2026.135941

Research Groups

School of Civil, Environmental and Architectural Engineering, Korea University, Seoul, South Korea
Future and Fusion Lab of Architectural, Civil and Environmental Engineering, Korea University, Seoul, South Korea

Short Summary

This study develops a diagnostic framework to separate typhoon and non-typhoon rainfall within a Budyko analysis, revealing structural hydrological regime shifts in coastal-to-inland basins. The framework detects a precipitation-regime shift around 2009, with increased runoff potential and disproportionate contribution of typhoon-related precipitation to extreme events.

Objective

• Investigate the impact of typhoons on long-term hydrological changes in coastal-to-inland river basins using a Budyko-based diagnostic framework.

Study Configuration

• Spatial Scale: Basin-scale analysis of the Qiantang River Basin (QRB), eastern China.
• Temporal Scale: 1980–2020 time period, with a focus on regime shifts around 2009.

Methodology and Data

• Models used: Budyko framework for runoff analysis.
• Data sources: Hydrological data from 11 stations in the QRB during 1980–2020.

Main Results

• Detection of a precipitation-regime shift around 2009, with increased annual rainfall (13–15%) and runoff potential.
• Disproportionate contribution of typhoon-related precipitation to extreme events, particularly in coastal-adjacent subbasins.

Contributions

• Development of a generalizable diagnostic framework for separating typhoon and non-typhoon rainfall within a Budyko analysis.
• Demonstration of the framework's applicability to coastal-to-inland systems worldwide.

Funding

• This research was supported by grants from the Korea University Future Research Fund (KU-FRF) and the National Research Foundation of Korea (NRF).

Citation

@article{Qian2026Separating,
  author = {Qian, Xiaojuan and Son, Sangyoung},
  title = {Separating typhoon and non-typhoon rainfall reveals structural hydrological regime shifts in coastal-to-inland basins},
  journal = {Journal of Hydrology},
  year = {2026},
  doi = {10.1016/j.jhydrol.2026.135941},
  url = {https://doi.org/10.1016/j.jhydrol.2026.135941}
}