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

Just Posted

Black Press file photo
RCMP seek suspect in Vancouver Island-wide crime spree

Crimes stretched from Deep Bay to Qualicum, Ladysmith, Chemainus and Youbou

Flag exhibit is now set up in the Chemainus Valley Museum. (Photo by Val Galvin)
Fibre artists put their unique twists on climate change exhibit

Red Flag warning label affixed to collection now on display at the Chemainus Valley Museum

Things are looking up for Vancouver Island as zero COVID-19 cases have been reported for the first time since October. THE CANADIAN PRESS/Darryl Dyck
Island records zero new COVID-19 cases for the first time since October

For the first time since October, the province is reporting zero new… Continue reading

Letters to the editor.
Many questions emerge from opioid dealer’s sentence

Leniency hard to fathom, especially after judge’s harsh words

The Crofton Pool will reopen July 2. (File photo by Don Bodger)
Lifeguard services returning to Fuller Lake Park, Crofton Pool

Summer schedule starting after hiatus in 2020 due to the pandemic

A small pod of Pacific white-sided dolphins pass by close to shore in Campbell River June 16, 2021. Still capture from video courtesy of Kimberly Hart
VIDEO: Dolphin sunset captured from Vancouver Island shore

Spectacular setting for view of travelling pod of Pacific white-sided dolphins

A North Vancouver man was arrested Friday and three police officers were injured after a 10-person broke out at English Bay. (Youtube/Screen grab)
Man arrested, 3 police injured during 10-person brawl at Vancouver beach

The arrest was captured on video by bystanders, many of whom heckled the officers as they struggled with the handcuffed man

Cannabis bought in British Columbia (Ashley Wadhwani/Black Press Media)
Is it time to start thinking about greener ways to package cannabis?

Packaging suppliers are still figuring eco-friendly and affordable packaging options that fit the mandates of Cannabis Regulations

Bruce Springsteen performs at the 13th annual Stand Up For Heroes benefit concert in support of the Bob Woodruff Foundation in New York on Nov. 4, 2019. (Greg Allen/Invision/AP)
Canadians who got AstraZeneca shot can now see ‘Springsteen on Broadway’

B.C. mayor David Screech who received his second AstraZeneca dose last week can now attend the show

New research suggests wolves can be steered away from the endangered caribou herds they prey on by making the man-made trails they use to hunt harder to move along. THE CANADIAN PRESS/Nathan Denette
Culling cutlines, not B.C. wolves, key to preserving caribou herds: researcher

The government has turned to killing hundreds of wolves in an effort to keep caribou around

Gary Abbott (left) and Louis De Jaeger were two of the organizers for the 2014 Spirit of the People Powwow in Chilliwack. Monday, June 21, 2021 is Indigenous Peoples Day. (Jenna Hauck/ Chilliwack Progress file)
Unofficial holidays: Here’s what people are celebrating for the week of June 20 to 26

Indigenous Peoples Day, Take Your Dog to Work Day, Onion Rings Day all coming up this week

Gwen Spencer Hethey with her uncle and mentor Major Frederick Richardson. (Courtesy of Greater Victoria Sports Hall of Fame)
‘She was a killer’: The B.C. woman who pioneered female sharpshooting

Gwen Spencer Hethey made military men ‘look like turkeys’ says her son

Central Okanagan Grade 12 grads are set to get $500 each after a more than $1 million donation from a Kelowna couple. (File photo)
B.C. couple donating $500 to every Grade 12 student in the Okanagan

Anonymous donors identified as Kelowna entrepreneurs Lance and Tammy Torgerson

Most Read