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Wildfires threaten river networks in the western U.S.

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https://phys.org/news/2021-05-wildfires-...stern.html

INTRO: A new study conducted by researchers from The University of New Mexico has found that wildfires—which have been increasing in frequency, severity and extent around the globe—are one of the largest drivers of aquatic impairment in the western United States, threatening our water supply.

The research, "Wildfires increasingly impact western U.S. fluvial networks," was published recently in Nature Communications. Authors include former UNM graduate students Grady Ball (now at the U.S. Geological Service) and Justin Reale (now at U.S. Army Corps of Engineers); former postdoctoral researcher Peter Regier (now at Pacific Northwest National Laboratory); associate professor Ricardo González-Pinzón (Department of Civil, Construction and Environmental Engineering) and research assistant professor David Van Horn (Department of Biology).

The study found that about 6 percent of the length of all the streams and rivers in the western U.S. were directly affected by wildfire disturbances (defined by being located in burned areas) between 1984 and 2014, and that every year there are about 342 new kilometers of them directly affected. When the researchers accounted for the longitudinal propagation of water quality disturbances within and across watersheds, it was estimated that wildfires affect about 11 percent of the total stream and river length.

"More than 10 percent of the rivers in the western U.S. have been impacted by wildfires," González-Pinzón said. "That's a lot and puts wildfires as one of the top causes of water impairment in the country. It's a big deal." (MORE)
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