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Shift in precipitation-streamflow relationship induced by multi-year drought across global catchments
Qiang Liu1, Yuting Yang2, Liqiao Liang3
1State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, China; Key Laboratory for Water and Sediment Sciences, Ministry of Education, School of Environment, Beijing Normal University, Beijing 100875, China.
The Science of the Total Environment
|October 21, 2022
Summary
Climate change intensifies droughts, altering precipitation-streamflow dynamics. Vegetation plays a key role in hydrological drought legacy, influencing water resource management.
Area of Science:
- Hydrology
- Climate Science
- Ecology
Background:
- Climate change is increasing drought intensity and frequency, leading to uncertainty in precipitation-streamflow (P-Q) relationships.
- Understanding the long-term impacts of drought, known as hydrological legacy, is crucial for water resource management.
Purpose of the Study:
- To assess alterations in P-Q relationships due to multi-year droughts.
- To analyze lag and amplification effects between meteorological and hydrological droughts.
- To investigate the role of vegetation (Leaf Area Index - LAI, Horton index) in drought legacy across global catchments.
Main Methods:
- Analysis of P-Q relationships in 1210 global catchments, focusing on multi-year droughts.
- Assessment of lag and amplification between meteorological and hydrological droughts.
- Utilized LAI and Horton index to quantify hydrological legacy, combined with a conceptual bucket model.
Main Results:
- Reduced precipitation (P) lowers streamflow (Q) in arid regions but can increase Q in humid regions.
- Hydrological drought severity is generally amplified compared to meteorological drought.
- Vegetation, stimulated by drought, maintained higher LAI and lower Horton index, particularly in humid regions, influencing P partitioning and catchment response.
Conclusions:
- Droughts significantly alter P-Q relationships, with regional variations.
- Vegetation plays a critical role in the hydrological legacy of droughts, affecting catchment resilience.
- Understanding these complex interactions is vital for predicting hydrological responses to climate change.
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