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World

Study Finds Climate Change Altering Europe's River Floods 

River floods are among the costliest natural disasters worldwide, causing annual damages of more than $100 billion

This June 9, 2013 file picture shows an aerial view the city of Deggendorf, Germany flooded by Danube river, photo: Keystone/Wolfram Zummach, via AP
1 month ago

BERLIN – Climate change is affecting the timing of river floods across Europe and societies may have to adapt to avoid future economic and environmental harm, scientists said Thursday.

River floods are among the costliest natural disasters worldwide, causing annual damages of more than $100 billion. They affect millions of people each year because many towns and cities are built along rivers.

Examining flood data across a 50-year period, researchers found significant shifts in timing along the Atlantic coast of western Europe from 1960 to 2010.

According to a paper published in the journal Science, half of the measurement stations from England to Portugal showed floods were occurring on average at least 15 days earlier by 2010 compared to a half century earlier.


In northeastern Europe, earlier snow melts also brought river floods forward by at least eight days over the 50-year period, while areas around the North Sea are now seeing floods happen more than a week later than in 1960.

“If the trends in flood timing continue, considerable economic and environmental consequences may arise, because societies and ecosystems have adapted to the average within-year timing of floods,” the authors concluded.

They cited possible harm to farming around the North Sea from later winter floods that leave the ground softer going into spring. Water utility companies in northeastern Europe may need to begin filling reservoirs with the earlier water surges rather than waiting for later flooding to ensure sufficient supply for hydropower plants and irrigation, they said.

The study’s authors, led by Guenter Bloeschl of Vienna’s Technical University, cautioned that the precise mechanism by which flood patterns change is complex and still needs to be fully understood.


While data on the timing of floods showed a clearer link with climate change than past studies that looked into flood severity, the researchers noted that several factors affect the timing of floods — including the amount of rainfall, the nature of the soil, upriver snow melt and land use. Not all the shifts are necessarily caused by man-made global warming, they said.

Bloeschl said the researchers would try to use their findings to predict future changes in the timing of seasonal floods.

“We really expect these trends to increase,” he said. “The […] timing trends we have observed in the past 50 years will just extend into the next decade.”

FRANK JORDANS

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