Climate change may be challenge for Inuvik Tuktoyaktuk Highway, researcher says

Researcher Chris Burn, who has spent decades studying climate, permafrost and Northern infrastructure, says engineers will needto keep aneyeon howthe Inuvik TuktoyaktukHighway changes in the years ahead.

"Water management, and snow management I think are the two items in the long run that are very important," the Carleton University professor said.

The 137-kilometre, $300million N.W.T. highway opened Wednesday.

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Burn, who has studied the Dempster Highway which connects to the southern terminus of the new highway says the Northern climate is changing and is already having a big effect on local infrastructure. The Dempster, he says, is seeing more subsidenceand washoutsthings often connected to thawing permafrost.

"In 1970, the mean temperature in Inuvik was about - 9 C, and now it's sitting at around about - 6 C. So, the mean temperature's rising steadily, over the last 40 years," he said.

"If it continues to rise at that rate, then it actually makes it very difficult to conceive of building things in the way that we did 50 or 60 years ago."

He notes that the InuvikTuktoyaktukHighway was designed with consideration of climate change,andsays a lot will dependon things like snow cover, and water disruption and the impact on permafrost.

"If we get more snow, in addition to greater warming, then the stability of the permafrost near to the road is under some stress," he said.

Water will becomeanissue asthe road disrupts the movement of surface water on the tundra.

"So [the highway]acts as a sort of little dam, all the way along the terrain, so any water that's moving down slopetowards the road will pool, on the up-slope side of the road. And this, again, leads to more erosion of the permafrost."

Dempstergetting more expensive

Burn says the DempsterHighway, which officially opened in 1979, has become significantly more expensive to maintain over the last decade. He says a lot of the increased costs can be attributed to climate-related maintenance.

"That would be snow maintenance, so clearing of snow; or dealing withslides or washouts where the road has been cut, or fixing culverts, or dealing with glaciers where there is water flowing onto the surface of the road," he said.

"Those expenses, since 2005, have increased by about $200,000 per year," he said, referring to the portion of the DempsterHighway that's in Yukon.

Burn says there's an upside, though, to seeing highway maintenance budgets go up it makes the costofclimate change more apparent.

"When it's possible to trace the impact of climate change onto the financial operation of a government, then I think there's more chance that people will see it as something that affects them directly."

Burn will be speaking about climate change and the DempsterHighway on Wednesday, at the Yellowknife Geoscience Forum.