The rains are threatening the burned areas in the West

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The western United States this century is facing a major problem of heavy rainfall filling areas affected by wildfires, new research says. Such events can cause significant damage, such as sewage, debris, and sewage flows, because denuded land cannot easily access water.

New research has found that if a company releases greenhouse gases at a high rate, a major fire event is more likely to be followed within a year by a major fire event than before. eight times in the Pacific Northwest by the end of the century. More than twice as many in California.

Overall, more than 90% of major fire incidents in the three regions investigated by the research team – namely Colorado with California and the Pacific Northwest – will be followed by at least three it has grown in five years.

The authors, including scientists at the National Center for Atmospheric Research (NCAR), used advanced computer models of the past and future, as well as a list of similar features. Do not give fire until they are consumed.

Lead author Danielle Touma, who did most of the research at the University of California, Santa Barbara, before going to NCAR, found that earlier research showed that fires were on the rise. fire and heavy rain in the West with climate change. However, the frequent increase in heavy rainfall after the fire came as a surprise.

“It’s very scary, because the destruction that comes with these kinds of events,” Touma said. “We need to be clear about the problems, because this creates a huge threat to people and businesses.”

The article will be published this week on Scientific advances. Researchers from the University of California, Santa Barbara; the University of California, Los Angeles; the Nature Conservancy of California; and Washington State University provided the tuition.

The fire and the rain are rising

Heavy rain in burned areas is difficult to predict, but can have disastrous consequences. In 2018, a landslide in Montecito, California, due to short and heavy rains over an area that burned a month earlier, left 23 people dead and massively dead. the property. Heavy rains in Colorado’s Glenwood Canyon last year created a massive landslide in the burned area, trapping 100 people and blocking a section of I-70 in the canyon for weeks. .

After a fire, the problem of sewage flow continues for 3-5 years, and the problem of water flow lasts for 5-8 years, for as long as it takes to cover. The growth of good soil and roots is followed by the growth of plants.

To study the frequency of events that occur after major wildfires in the tropics, Touma and his colleagues searched a group of models by several models of the climate. and the universe, with the NCAR-based Community Earth System Model, a powerful computer. so that they could plan for climate change in the western United States.

The results showed that, by the end of the century, air conditions would have doubled or more to lead to the problem of major wildfires in much of the West, with some areas becoming more prevalent. the amount of fire in the coming years. In addition, the models show a significant increase in the incidence of heavy rainfall.

Researchers have looked at how many cases of heavy rainfall in the same country have experienced a major wildfire. They found that more than half of all major wildfires are followed in a year by a heavy rainfall event in much of the West, and close to the largest wildfires in the Northwest Pacific. followed for five years by heavy rains. Once every three years, heavy rainfall in western Colorado or much of the Pacific Northwest is expected to fill the country three months after a major wildfire – a phenomenon that has not been seen. Done years ago.

Part of the reason for the combination of heavy fire and rain is due to the change in climate during these events. For example, the heaviest rainfall was seen in the first fall in Colorado and the Pacific Northwest, near the May and September fiery season.

“There’s a small difference between a fire and a rainy season,” Touma said. “One season of disasters is running into someone else.”


The amount of hot fire in the fall increased by 40%.


More information:
Danielle Touma, Air change increases the risk of heavy rains following a wildfire in the western United States, Scientific advances (2022). DOI: 10.1126 / sciadv.abm0320. www.science.org/doi/10.1126/sciadv.abm0320

Presented by the National Center for Atmospheric Research

Directions: Rain threatens fire-extinguished areas in West (2022, April 1) retrieved April 1, 2022 from https://phys.org/news/2022-04-drenching-pose -greater-threat-fire-damaged .html

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