VIDEO: Quadra Island-based research station investigates Bute Inlet slide

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
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.

A research team has been investigating the landslide that occurred in Bute inlet in November.

The Hakai Institute, which operates an ecological observatory on Quadra Island, conducts long-term research in the coastal regions of the province, including seismic research and ocean-based ecological research. Part of their research area is Bute Inlet, and they had been monitoring the area prior to the slide. After the landslide in Bute Inlet, the institute sent researchers out to the area for preliminary data on what the incident will mean for salmon habitat in the inlet.

Hakai founder Eric Peterson said that a team had been sent out on Dec. 22 to do a flyby, 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.

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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.

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

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



marc.kitteringham@campbellrivermirror.com

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