SOURCE: University of Calgary

University of Calgary

June 24, 2015 15:00 ET

Drone technology reveals impact of 2013 flood

Researchers find portion of Elbow river completely re-routed

CALGARY, AB--(Marketwired - June 24, 2015) - Two years after Calgary and parts of southern Alberta was rocked by record-setting floods, a team of researchers at the University of Calgary and the University of British Columbia are using drones to examine the toll of the deluge on local rivers.

The study, which began three years ago, started out as a way to map fish habitats in the Elbow River using drone technology.

"We started out trying to see what we could measure in rivers using drones, but after the 2013 flood we ended up in a unique position of being able to measure the effects of the flood at an unprecedented level of detail," says Chris Hugenholtz, Associate Professor and Cenovus Research Chair at the University of Calgary.

In a paper recently published online in The Earth Surface Processes and Landforms journal, the research team found that the flood completely restructured the flow of the Elbow River adjacent to Redwood Meadows.

"The magnitude of the change was catastrophic, such that parts of the river channel now looks nothing like it did before the flood," said Aaron Tamminga, a PhD student at UBC and lead author on the paper.

Comparing before-and-after maps and 3D models, research revealed that almost three hectares of river bank was carved away by the flood along a one kilometer stretch of the Elbow River, with some banks receding up to 100 meters. Detailed images from the drone also showed that the flood both straightened and widened the river channel and completely re-structured the gravel bed.

Brett Eaton, Associate Professor at UBC, notes that the river bed became armoured by the flood as parts of the bed are now littered with meter-scale boulders. "When we simulate the 2013 flood conditions over the current configuration of the river, we find that the river bed is more stable, which means that it will take an even larger flood than the 2013 event to produce the same magnitude of change in the future."

Over the course of the summer, Hugenholtz and his colleagues are ramping up efforts to measure the legacy of the 2013 flood on the Bow, Kananaskis and Elbow Rivers. They will also be looking at ways to integrate drones into a decision support framework for disaster management.

About the University of Calgary
The University of Calgary is a leading Canadian university located in the nation's most enterprising city. The university has a clear strategic direction to become one of Canada's top five research universities by 2016, where research and innovative teaching go hand in hand, and where we fully engage the communities we both serve and lead. This strategy is called Eyes High, inspired by the university's Gaelic motto, which translates as 'I will lift up my eyes.'

For more information, visit ucalgary.ca. Stay up to date with University of Calgary news headlines on Twitter @UCalgary. For details on faculties and how to reach experts go to our media centre at ucalgary.ca/news/media.

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