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Home NEWS Science News Biology

Study: Oregon’s Western Cascades watershed to experience larger, more frequent fires

Bioengineer by Bioengineer
December 14, 2020
in Biology
Reading Time: 3 mins read
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Credit: U.S. Forest Service – Pacific Northwest Region

The Clackamas Basin rarely experiences the intense fire activity that burned in the watershed during the Labor Day fires, but new research out of Portland State University shows that wildfires like the Riverside Fire, which grew to 138,000 acres within days, could become more common under a warming climate, even under non-extreme wind conditions.

The study found that wildfire hazard in the Clackamas Basin, which is the second largest source of drinking water for the Portland metro area, will likely increase by mid-century. Projected changes in temperature and relative humidity are expected to lead to longer fire seasons and more severe fire weather in Oregon’s Western Cascade mountains, which in turn will result in larger, more frequent fires.

“Because of shifts in climate, the scenarios that would create extreme fire events all become a little more plausible,” said Andy McEvoy, the study’s lead author and a graduate student in environmental science and management. “There will be that many more days under which those components of a fire — ignition, weather and fuel — can align in a terrible way.”

The group of researchers simulated four climate scenarios from 2040-2069, representing a range of plausible changes in temperature and humidity.

The simulations showed that the fire season increased from as little as eight days to as much as 32 days. The projected annual average area burned increased significantly by 50% under the least impactful scenario (the coolest and wettest of the four) and as much as 540% under the most extreme scenario (the hottest and driest of the four).

“We don’t make the case that one future is more likely than the other, but it helps bracket the plausible outcomes for planning purposes,” said McEvoy, who works as a research fellow in the U.S. Forest Service’s Pacific Northwest Research Station. “The future is very uncertain and if land and resource managers plan just for the average case, their plans are not going to be robust in the face of those worst-case scenarios.”

The researchers, who worked closely with the Clackamas River Water Providers and the Clackamas County Water and Environment Services, said the findings provide regional managers and planners with a tool to develop climate adaptation and risk mitigation strategies. Given the wide range of plausible future wildfire hazards, robust adaptation plans will be ones that maintain essential ecosystem services across the broadest range of scenarios by balancing land use management, fire suppression, and community preparedness strategies.

These efforts could range from designing and testing the effectiveness of fuel breaks — breaks in vegetation that can help firefighters control the spread of fire and protect homes and resources — to identifying susceptible communities and planning evacuations in the event of future extreme wildfires. In those cases, like the Riverside Fire, fuel breaks would not be successful and the only sensible strategy would be timely, safe evacuations.

“They’re planning for an uncertain future,” McEvoy said. “They have to plan using all available tools and adapt to events as they occur.”

###

The study’s findings are published in the journal Fire. Co-authors include Max Nielsen-Pincus, associate professor of environmental science and management; AndrĂ©s Holz, associate professor of geography; Arielle Catalano, a former postdoctoral scholar in PSU’s geography department; and Kelly Gleason, assistant professor of environmental science and management.

Media Contact
Cristina Rojas
[email protected]

Original Source

https://www.pdx.edu/news/oregons-western-cascades-watershed-experience-larger-more-frequent-fires-psu-study-finds

Related Journal Article

http://dx.doi.org/10.3390/fire3040070

Tags: Climate ChangeEarth ScienceForestryGeographyTemperature-Dependent Phenomena
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