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Observed shift towards earlier spring discharge in the main Alpine rivers
Matteo Zampieri1, Enrico Scoccimarro2, Silvio Gualdi2
1Centro Euro-Mediterraneo sui Cambiamenti Climatici (CMCC), V.le A. Moro 44, 40127 Bologna, Italy.
The Science of the Total Environment
|July 10, 2014
Summary
Major Alpine rivers show earlier spring discharge peaks, advancing over two weeks per century. Changes in precipitation seasonality are a key driver of this trend in river flow.
Area of Science:
- Hydrology and Climate Science
- Environmental Change Research
Background:
- Alpine river systems (Rhine, Danube, Rhone, Po) exhibit diverse seasonal discharge patterns due to varied climates and basin morphologies.
- Intensive water management practices are common across these major European rivers.
Purpose of the Study:
- To analyze long-term discharge time-series for key Alpine rivers.
- To identify common trends and variability in spring discharge timing across these rivers.
- To investigate the drivers influencing shifts in spring runoff seasonality.
Main Methods:
- Analysis of observed long-term discharge time-series data for the Rhine, Danube, Rhone, and Po rivers.
- Statistical examination of trends and low-frequency variability in spring discharge peaks.
- Correlation analysis with climatic factors including snowmelt, total precipitation, and rainfall variability.
Main Results:
- A consistent trend of earlier spring discharge peaks observed across all studied rivers, advancing by over two weeks per century.
- Snowmelt, total precipitation, and rainfall variability are identified as explanatory factors for the earlier spring runoff.
- The seasonality of total precipitation emerges as a significant driver for earlier spring runoff across most of the Alps.
Conclusions:
- Alpine river discharge timing is exhibiting a significant and common trend towards earlier spring peaks.
- Changes in precipitation patterns, particularly seasonality, play a crucial role in altering Alpine river hydrology.
- These findings highlight the impact of climate variability on major European river systems and water resource management.
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