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By Jessica Innis And Andrea King

Wildfires. By Jessica Innis And Andrea King. Wildfire History.

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By Jessica Innis And Andrea King

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  1. Wildfires By Jessica Innis And Andrea King

  2. Wildfire History When the native people were living in tribes, wildfires were very common. They would occur around grassy and forested areas. Before the Europeans came and settled, the wildfire would occur in the woodland areas every 10-30 years. Then, every 2-10 years they would occur in the pine communities, and every 5-25 years in the forests. The forests on the highest part of the mountain that are cooler and wetter would burn every 150 years or more. After the Europeans came and brought their livestock, the number of fires started to decrease. This happened because of the livestock eating the grassy areas that fires generally fed on.. Then the people had to make roads, so they cut through some of the forests. Having a reduction of forests decreased the amount of wildfires.

  3. How Do Wildfires Occur? Wildfires can be started by just heat from the sun or by a lightning strike. The ground can get so dry due to drought because of a combination of a dry period and high winds. After the sun dries up all the moisture, it just starts heating the ground. When the sun heats the ground, at a certain temperature a fire begins.

  4. How Fires Begin to Spread There are three ways that help a fire spread faster. They are the following: 1. Fuel 2. Weather 3. Topography

  5. Fuel One thing that helps a fire spread faster is their fuel. The word fuel in this case means all the trees, bushes, dry fields, and even homes. People recall a fuel load as the amount of material that is flammable that surrounds the fire itself. They measure the fuel load by how much there is available per area and per acre. When a fire burns and spreads slowly with a low intensity, this is a small fuel load. When there is a larger fuel load , it still causes a fire to burn (of course) but it spreads more quickly, at a faster speed.

  6. Weather Another thing that helps a fire burn is the weather. Some types of weather that effect the fire are winds, temperature, moisture. WINDS help the fire spread faster. It does this because it is giving the fire extra oxygen. The fire will spread at faster rate with a higher wind speed. The direction of the fire can be changed with the direction of the wind. Sometimes the wind causes the fire to throw embers in the air. Where these embers land, they usually start a new fire. These new fires are called spottings.

  7. Temperature Temperatures are one of the weather’s aspects. It also helps to start a fire. The warmer the temperature the easier it is for a fire to burn. The trees and everything on the ground get heat from the sun, then they start up. Fires usually start in the afternoon because they have warmer temperatures. In the cold temperate areas fires don’t usually occur.

  8. Moisture Moisture is the last one of the weather aspects. The more moisture the less chance of a fire. If there is a fire and it starts to rain then, the rain works against it. If it doesn’t rain then the fire will keep on spreading unless the wind changes direction and blows back over the burned out area. With the fuels of a fire, in order for them to start up, they have to be dry, no moisture. That is why after it rains, the fire hazard alert goes down.

  9. TOPOGRAPHY With certain topography, such as mountains, rivers, and valleys, they help move the fire faster or slower.

  10. Mountains Mountains are a type of topography that help move fires faster. Fires moves faster going uphill, rather than downhill. So, the steeper the slope on the route the fire travels, the faster it will move. Wind usually travels uphill, so that it is one of the reasons that fire spreads faster. Also the smoke and heat from the fire rises up to the sky. When it’s raising, it heats up the fuel on the mountain. After the fire burns all the trees and the bushes in the mountain the effects of that don’t come until a while later. As the fire is burning down all the trees and bushes, it is weakening the soil underneath. Then when it rains, the water breaks down the soil, which because of this we have an erosion of rocks, soil, and other things to that extent.

  11. Rivers and Valleys Rivers don’t really have any effect on how the wildfires spread. If you live close to them then that is good because if a wildfire started near you, then go into the river and keep dosing yourself with water so you can stay moist. If the river water is lower than usually, then it is more of a risk for wildfires to spread. With valleys , if the fire starts then it will move up the mountains. If the fire starts on the mountain, then you will have time to see it and move. It takes longer for the fire to move down than to move up.

  12. What Could You Do When a Wildfire Comes Near You? If you know of wildfire that is coming your way, and it isn’t a very large fire then you can take a hose and wet down your house and roof. If it is an extremely dangerous fire, then evacuate. Don’t stay around.

  13. How Does it Effect You? Wildfires can effect people in many different ways. They can burn your land and house with all your possessions. If you are a farmer, and your land burns then that is really bad. Your crops are no longer there, so that can put you on hold for awhile until you can re-grow, if that is possible. If you just live in a town and a fire burns down your house plus many others, and all the businesses in that town then there could be a lot of people out of business, jobs, homes. Wildfires effect people though by not just taking their jobs away, but also taking the lives of some of their families and friends.

  14. Emergency Teams The emergency teams consist of the firefighters in the area of the fire. If it is an extremely large fire then they will call in back up from other firehouses. Also there are people called smokejumpers. These are firefighters who will jump out of planes. They jump into the area of the fire and try to stop it before it can move any where further. Another thing that helps to put out the fire are Air Tankers. These are the people who control the helicopters that get gallons of water from other lakes, then dump the water over the fire.

  15. Average Number of Fires and Acres Burned By Decade DatesAverage Number of FiresAverage Acres Burned 1919-192997,59926,004,567 1930-1939167,27739,143,195 1940-1949162,05022,919,898 1950-1959125,9489,415,796 1960-1969 119,7724,571,255 1970-1979155,1123,194,421 1980-1989163,3294,236,229 1990-1999106,3063,647,597 This chart is showing you the number of fires in the decades, and how many acres of land they burned.

  16. Colour Map On the next slide there is a map that was colour coded to show you the different areas of the United States that are affectd by Wildfires. The different colours show how much of a risk that place is.

  17. Government Help Within your own countries, there are certain places that will give money to families that have lost their houses and possessions. Also, there are certain companies that give money to organizations that have been burned or damaged from a wildfire. In the chart in the next slide, it is showing how many organizations received money from federal agencies and the amount of money received.

  18. The Chart YearBureau of Bureau of Fish and National Park USDA Forest Totals Land Management Indian AffairsWildlife ServiceService Service 1994$ 98,417,000$ 49,202,000 $ 3,281,000 $ 16,362,000$ 678,000,000$ 845,262,000 1995$ 56,600,000$ 36,219,000$ 1,675,000$ 21,256,000$ 224,300,000$ 340,050,000 1996$ 96,854,000$ 40,779,000$ 2,600$ 19,832,000$ 521,700,000$ 679,167,600 1997$ 62,470,000$ 30,916,000$ 2,000$ 6,844,000$ 155,768,000$ 256,000,000 1998$ 63,177,000$ 27,366,000$ 3,800,000$ 19,183,000 $ 215,000,000$ 328,526,000 1999$ 85,724,000$ 42,183,000$ 4,500,000$ 30,061,000$ 361,000,000$ 523,468,000 2000$180,567,000$ 93,042,000$ 9,417,000$ 53,341,000$ 1,026,000,000$1,362,367,000 2001 $ 192,115,00 $ 63,200,000 $ 7,160,000 $ 48,092,000 $ 607,233,000 $ 917,800,000 2002 $ 204,666,000 $ 109,035,000 $ 15,245,000 $ 66,094,000 $ 1,266,274,000 $1,661,314,000

  19. Before This picture was taken in Colorado. The fire had started in the mountains.

  20. During This picture was taken in Colorado.

  21. After The results from the fire.

  22. Pictures

  23. Conclusion We hope that you have enjoyed our presentation and learned the different aspects of a Wildfire. Have a great day.

  24. Bibliography http://www.howstuffworks.com/wildfire.htm http://www.cpluhna.nau.edu/Biota/wildfire.htm http://www.time.com/time/photoessays/coloradofires/index.html http://www.nifc.gov/stats/wildlandfirestats.html http://www.greenforests.com/video.html http://sofia.er.usgs.gov/…/ http://www.nps.gov/…/wilderness_travel.htm http://www.positive-inside.de/Bambous-Mountains.html

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