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Four-Decade Evolution of Runoff Components and Cryospheric Contributions in an Alpine Inland River Basin, Tibetan Plateau
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J
DOI：10.1002/hyp.70630.png)
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Abstract
En 中文
This study investigates the evolution of runoff components and their drivers in the Buha River Basin, the largest tributary of Qinghai Lake on the Tibetan Plateau, over the period 1982–2022, using the process-based THREW-T hydrological model. Our findings reveal a fluctuating upward trend in annual runoff, with a notable transition from decline to increase occurring around 2009. The model demonstrated robust performance in simulating runoff at both daily and monthly time steps, achieving NSE coefficients of 0.73 and 0.80, respectively. Runoff composition analysis indicated that rainfall dominated total streamflow, followed by snowmelt, while glacial meltwater plays a negligible role. The contributions of baseflow and surface runoff remained relatively stable throughout the study period. Adding permafrost processes to the model seasonally modified baseflow partitioning, reflecting a seasonal reorganisation of runoff paths. Attribution analysis using the Budyko elasticity method identified precipitation as the primary climatic driver of runoff changes, with potential evapotranspiration exerting a secondary and opposing influence. This study elucidates key hydrological processes in alpine inland river systems and provides a scientific basis for sustainable water management under changing climate.
Keywords:
alpine inland river basin
Buha River Basin
climate change
runoff composition
runoff variability
THREW-T model
Journal
IF:
2.9
Papers:
614
Citations:
2.2W
Organization
Cited Papers