VIDEO: Investigators probe Bute Inlet landslide in bid to understand glacial retreat

The slide swamped the Southgate River, around 13 km downhill from the initial incident. Photo supplied by Hakai Institute.The slide swamped the Southgate River, around 13 km downhill from the initial incident. Photo supplied by Hakai Institute.
Elliot Lake, where the slide initially hit on Nov. 28. Photo supplied by Hakai InstituteElliot Lake, where the slide initially hit on Nov. 28. Photo supplied by Hakai Institute

A research team is probing a devastating landslide on the B.C. central coast in the hopes of predicting if and when another slide may be coming.

The Hakai Institute, which operates an ecological observatory on Quadra Island, near Campbell River, conducts long-term research in the coastal regions of the province, including seismic research and ocean-based ecological research. Part of its research area is Bute Inlet — site of the Nov. 28 slide that launched a 100-metre wave that washed out the Southgate River.

The institute had been monitoring the area prior to the slide, and afterwards sent out researchers for preliminary data on what the incident will mean for salmon habitat in the inlet.

Hakai founder Eric Peterson said that a team did a flyby on Dec. 22, which includes a lidar (light detection and ranging) scan, which is similar to radar, but with laser light instead of sound waves.

“The instrument is a specialized laser scanner,” Peterson said. “We make multiple passes and thereby build up a very precise 3D model of the landscape. Fortunately, we have recent lidar/3D models from before the landslide from our ongoing research.”

The lidar scan will shed some light on the stability of the mountain and the risk of other slides, as well as information on how it happened and whether or not it is likely to happen again.

“We hope to be able to conduct a detailed comparison of the ‘before’ and ‘after’ 3D lidar models, and thereby be able to work out exactly what material moved from where to where,” he said. “The current model may help us predict whether the mountain is stable now, or whether another collapse might be coming.”

Peterson explained that the slide highlights the issue of glacial retreat along the coast. Whether or not the glacier’s retreat was a direct cause of the Bute Inlet slide is to be determined, but retreating glaciers often cause instability and make the landscape more sensitive to landslides.

According to a video posted on the Hakai Institute website, the landslide occurred at around 6 a.m. on Nov. 28. The initial event had an equivalent shock as a 4.9 earthquake, and sent roughly 10 million cubic metres of material into Elliot Lake, just north of the end of the inlet.

That material caused a glacial lake outburst, which sent a 100-metre wave down the narrow creek, uprooting trees and carving a deep channel through the valley. Once the water hit the ocean, it caused a current of high-turbidity water to extend out 70 km.

Story continues below…

Researchers measured the temperature of the water over a few weeks following the slide, and recorded a 0.5 degrees Celsius dip in deep water temperature. A temperature change can effect the amount of dissolved oxygen and the pH of the water. Increased sediment in the ocean is also likely to impact which bacteria and phytoplankton can grow, which has a direct effect on the salmon in the area.

Since staff have been off for the holidays, analyzing the data has taken some time. The video posted on Dec. 22 is an introduction to the upcoming data and preliminary research, and more information will be made available as it comes.

Hakai researchers are working closely with the Homalco First Nation, since the incident took place on their resource management area.

“We expect to be working together in the coming years on research, remediation, recovery, stewardship of salmon, forestry, and all the elements of this complex & dynamic ecosystem,” Peterson said.

For more news from Vancouver Island and beyond delivered daily into your inbox, please click here.

RELATED: 100-metre wave causes massive washout in Bute Inlet

RELATED: Generation of B.C. salmon likely wiped out by central coast landslide



marc.kitteringham@campbellrivermirror.com

Like us on Facebook and follow us on Twitter

Campbell RiverEnvironmentLocal News

Get local stories you won't find anywhere else right to your inbox.
Sign up here

Just Posted

A health-care worker prepares a dose of the Pfizer-BioNTech COVID-19 vaccine at a UHN COVID-19 vaccine clinic January 7, 2021. THE CANADIAN PRESS/Nathan Denette
Employers might be able to require COVID-19 vaccination from employees: B.C. lawyer

‘An employer must make the case’ using expert science, explains lawyer David Mardiros

Local health authority maps are updated each week. The brown maps show the number of confirmed and active cases of COVID-19 for the week of Jan. 15 to 21, with the blue map showing cases over the past year. (Image supplied)
COVID-19 outbreak numbers increase at Acropolis and exposures are up in S.D. 52

Business COVID-19 safety plans are law, public needs to follow health protocols - Northern Health

Asher Hauknes shows his strength with Prince Rupert Gymnastics head coach Erin Hipkiss looking on Nov. 13. (Photo: K-J Millar/The Northern View)
Gymnastics Association benefits from Community Gaming Grant

Prince Rupert sports club to receive just less than $90,000 to build new facility

The COVID-19 outbreak at the two Coastal GasLink workforce lodges has officially been declared over. (Lakes District News file photo)
COVID-19 outbreak at Coastal GasLink worksites declared over

In total, 56 cases were associated with the outbreak in the Burns Lake and Nechako LHAs

Prince Rupert Fire Rescue was dispatched to a boat fire on Jan. 21 at Fairview Marina. (Photo: supplied)
Boat fire under investigation

Prince Rupert Fire Rescue attended boat fire at Fairview Marina

U.S. Senator Bernie Sanders sits in on a COVID-19 briefing with Dr. Bonnie Henry, provincial health officer, and Adrian Dix, B.C. minister of health. (Birinder Narang/Twitter)
PHOTOS: Bernie Sanders visits B.C. landmarks through the magic of photo editing

Residents jump on viral trend of photoshopping U.S. senator into images

From the left: Midway RCMP Csts. Jonathan Stermscheg and Chris Hansen, Public Servant Leanne Mclaren and Cpl. Phil Peters. Pictured in the front are Mclaren’s dog, Lincoln and Peters’ dog, Angel. Photo courtesy of BC RCMP
B.C. Mounties commended for bringing firewood to elderly woman

Cpl. Phil Peters said he and detachment members acted after the woman’s husband went to hospital

Dr. Jerome Leis and Dr. Lynfa Stroud are pictured at Sunnybrook Hospital in Toronto on Thursday, January 21, 2021.THE CANADIAN PRESS/Frank Gunn
‘It wasn’t called COVID at the time:’ One year since Canada’s first COVID-19 case

The 56-year-old man was admitted to Toronto’s Sunnybrook Health Sciences Centre

An Uber driver’s vehicle is seen after the company launched service, in Vancouver, Friday, Jan. 24, 2020. Several taxi companies have lost a court bid to run Uber and Lyft off the road in British Columbia. THE CANADIAN PRESS/Darryl Dyck
Taxi companies lose court bid to quash Uber, Lyft approvals in British Columbia

Uber said in a statement that the ruling of the justice is clear and speaks for itself

A 75-year-old aircraft has been languishing in a parking lot on the campus of the University of the Fraser Valley, but will soon be moved to the B.C. Aviation Museum. (Paul Henderson/ Chilliwack Progress)
Vintage military aircraft moving from Chilliwack to new home at B.C. Aviation Museum

The challenging move to Vancouver Island will be documented by Discovery Channel film crews

A video posted to social media by Chilliwack resident Rob Iezzi shows a teenager getting kicked in the face after being approached by three suspects on Friday, Jan. 22, 2021. (YouTube/Rob i)
VIDEO: Security cameras capture ‘just one more assault’ near B.C. high school

Third high-school related assault captured by Chilliwack resident’s cameras since beginning of 2021

FILE - In this Feb. 14, 2017, file photo, Oklahoma State Rep. Justin Humphrey prepares to speak at the State Capitol in Oklahoma City. A mythical, ape-like creature that has captured the imagination of adventurers for decades has now become the target of Rep. Justin Humphrey. Humphrey, a Republican House member has introduced a bill that would create a Bigfoot hunting season, He says issuing a state hunting license and tag could help boost tourism. (Steve Gooch/The Oklahoman via AP, File)
Oklahoma lawmaker proposes ‘Bigfoot’ hunting season

A Republican House member has introduced a bill that would create a Bigfoot hunting season

Economic Development and Official Languages Minister Melanie Joly responds to a question in the House of Commons Monday November 23, 2020 in Ottawa. THE CANADIAN PRESS/Adrian Wyld
Federal minister touts need for new B.C. economic development agency

Last December’s federal economic update promised a stimulus package of about $100 billion this year

FILE - In this Nov. 20, 2017, file photo, Larry King attends the 45th International Emmy Awards at the New York Hilton, in New York. Former CNN talk show host King has been hospitalized with COVID-19 for more than a week, the news channel reported Saturday, Jan. 2, 2021. CNN reported the 87-year-old King contracted the coronavirus and was undergoing treatment at Cedars-Sinai Medical Center in Los Angeles. (Photo by Andy Kropa/Invision/AP, File)
Larry King, broadcasting giant for half-century, dies at 87

King conducted an estimated 50,000 on-air interviews

Most Read