April 22 landslide in northern Quebec second largest in 150 years, say experts

“It may take months, if not years, for the river to return to its normal course,” says Quebec Ministry of Transportation geologist and landslide expert Denis Demers. (Courtesy NV Kuujjuaraapik)

Experts from the provincial government are expected in northern Quebec next week to survey the April 22 landslide that officials are calling the second largest such event in Quebec over the last 150 years. 

The landslide affected a thick clay soil zone approximately eight kilometres upstream from the Inuit village of Kuujjuaraapik and the neighbouring Cree community of Whapmagoostui. Over 45 million cubic metres of debris ended up in Great Whale River, the body of water both villages are located on.

The landslide measures 1.8 kilometres long and 500 metres wide across the riverbank.

In a news release on Thursday, the Kativik Regional Government, the administrative body in Nunavik, the Inuit region of Arctic Quebec where Kuujjuaraapik is located, said the landslide is the longest ever recorded in the province, besides being the second largest overall in a century and a half. 

The two communities are not in danger but locals and experts are continuing to monitor the situation.

“There is no need of immediate concern as long as the river is flowing and we continue to monitor the ice,” said elder George Kawapit in a news release. “This is due to very small snow fall in comparison to previous years.”

Government experts will travel north next week to examine the soil erosion, the riverbank condition and the downstream water flow from Great Whale River into Hudson Bay. (Courtesy NV Kuujjuaraapik)

Quebec Ministry of Transportation geologist and landslide expert Denis Demers, who participated in a virtual meeting with the community on Wednesday, said the amount of debris would likely have longterm impact.

“The worst is over,”  Demers said. “The major part of the debris from the landslide has spilled into the river. It may take months, if not years, for the river to return to its normal course.”

Light detection and ranging images to provide key information 

Government experts from southern Quebec are still waiting for ariel LIDAR images before making the trip north. 

LIDAR is short for “light detection and ranging.”  The system involves pointing laser pulses at a target and measuring the time it takes for light to bounce back to the receiver. These measurements allow the make up of high resolution maps and 3D models of a given area of land, ocean floors or river beds.

The experts are expected to have the topographic data and be able to fly to Kuujjuaraapik next week to inspect the landslide on site.

Over 45 million cubic metres of debris ended up in Great Whale River. (Courtesy NV Kuujjuaraapik)

Among the key areas specialists will examine include soil erosion, the riverbank condition and the downstream water flow from Great Whale River into Hudson Bay.

Until then, community leaders will create a safety zone around the landslide and warn residents of the dangers of getting inside the buffer area.

Communities in no danger, say experts

Officials have evaluated community safety further down the river but say the low riverbank height near Kuujjuaraapik means any potential landslide would not pose a risk to residents, the Kativik Regional Government said.

Write to Eilís Quinn at eilis.quinn(at)cbc.ca

Related stories from around the North:

Canada: Landslides on island in Arctic Canada up 6,000% since 1984, study finds, CBC News

Greenland: Greenland ice cores reveal historic climate clues, says study, Eye on the Arctic

Norway: New climate report predicts extreme warming for Arctic Svalbard by 2100, The Independent Barents Observer

Russia: The island that disappeared in Arctic Russia, The Independent Barents Observer

United States: Climate change a threat to bases across the U.S., Defense Dept. says, Alaska Public Media

Eilís Quinn, Eye on the Arctic

Eilís Quinn, Eye on the Arctic

Eilís Quinn is an award-winning journalist and manages Radio Canada International’s Eye on the Arctic news cooperation project. Eilís has reported from the Arctic regions of all eight circumpolar countries and has produced numerous documentary and multimedia series about climate change and the issues facing Indigenous peoples in the North.

Her investigative report "Death in the Arctic: A community grieves, a father fights for change," about the murder of Robert Adams, a 19-year-old Inuk man from Arctic Quebec, received the silver medal for “Best Investigative Article or Series” at the 2019 Canadian Online Publishing Awards. The project also received an honourable mention for excellence in reporting on trauma at the 2019 Dart Awards in New York City.

Her report “The Arctic Railway: Building a future or destroying an culture?” on the impact a multi-billion euro infrastructure project would have on Indigenous communities in Arctic Europe was a finalist at the 2019 Canadian Association of Journalists award in the online investigative category.

Her multimedia project on the health challenges in the Canadian Arctic, "Bridging the Divide," was a finalist at the 2012 Webby Awards.

Her work on climate change in the Arctic has also been featured on the TV science program Découverte, as well as Le Téléjournal, the French-Language CBC’s flagship news cast.

Eilís has worked for media organizations in Canada and the United States and as a TV host for the Discovery/BBC Worldwide series "Best in China."

Do you want to report an error or a typo? Click here!

Leave a Reply

Note: By submitting your comments, you acknowledge that Radio Canada International has the right to reproduce, broadcast and publicize those comments or any part thereof in any manner whatsoever. Radio Canada International does not endorse any of the views posted. Your comments will be pre-moderated and published if they meet netiquette guidelines.
Netiquette »

Your email address will not be published. Required fields are marked *