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20.12.2020 Europe’s rivers fragmented by one million barriers
A study published in the scientific journal “Nature” with the participation of IGB shows: Europe has some of the most fragmented rivers in the world.
On average, there is about one barrier per 1.4 kilometres of stream, in Germany even two barriers per kilometre. Small transverse structures with an impoundment height of less than two metres account for the lion’s share. The study also shows opportunities for reconnecting streams and rivers.
The study, led by researchers at Swansea University’s Centre for Sustainable Aquatic Research (CSAR) in the UK, reveals that Europe’s rivers as a whole include at least 1.2 million transverse structures within their course, including large dams, but mainly a large number of low-head structures such as weirs, culverts, fords, sluices and ramps. Using barrier modelling and extensive field ground-truthing, the research team showed that, on averag
Photograph by Andia, Universal Images Group/Getty Images
Rivers in Europe are more fragmented meaning their natural flows are interrupted by man-made barriers than any other continent’s rivers, new research shows.
In a four-year study spanning 36 European countries, scientists surveyed almost 1,700 miles of river by foot and found at least 1.2 million obstacles preventing European rivers from flowing freely. That’s more than one barrier for every mile of river (or 0.74 barriers per kilometre).
“The numbers we found are higher than expected, and show that European rivers are broken,” says Barbara Belletti, a river geomorphologist who led the study at the Polytechnic University of Milan.