An attribution approach of streamflow variations based on the water-energy partitioning framework
In the context of climate change and anthropogenic disturbances,understanding the response mechanisms of streamflow variations to changes in climate and watershed underlying characteristics has been a vital research focus in hydrology.Based on planar geometry and the water-energy partitioning framework,this study proposed the quantitative analytical formulas for attributing the contributions of climate and underlying characteristics to streamflow variations.Using long-term datasets of 83 typical watersheds in the world,the attribution results calculated by the water-energy partitioning framework and the Budyko decomposition method were compared.The results show that the global streamflow attributions of these two approaches were generally consistent,affirming the effectiveness of the newly developed framework.Furthermore,the water-energy partitioning framework is much simpler and easier to be applied,as compared to the Budyko decomposition method.It is also found that in most basins,the positive impacts of climate change on streamflow(resulting in increased streamflow)were offset by the negative effect caused by underlying characteristics(resulting in decreased streamflow),indicating a potential compensatory effect,while such a compensatory effect weakens with increasing drought severity.This study proposes a new decomposition method to streamflow attribution analysis,and also provides new perspectives for understanding the causes of global streamflow changes.
万方数据
维普
