forest fire


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forest fire:

see forestryforestry,
the management of forest lands for wood, water, wildlife, forage, and recreation. Because the major economic importance of the forest lies in wood and wood products, forestry has been chiefly concerned with timber management, especially reforestation, maintenance of
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.

fire, forest:

see forestryforestry,
the management of forest lands for wood, water, wildlife, forage, and recreation. Because the major economic importance of the forest lies in wood and wood products, forestry has been chiefly concerned with timber management, especially reforestation, maintenance of
..... Click the link for more information.
.

Forest fire

The term wildfire refers to all uncontrolled fires that burn surface vegetation (grass, weeds, grainfields, brush, chaparral, tundra, and forest and woodland); often these fires also involve structures. In addition to the wildfires, several million acres of forest land are intentionally burned each year under controlled conditions to accomplish some silvicultural or other land-use objective or for hazard reduction.

Most wildfires are caused by human beings, directly or indirectly. In the United States less than 10% of all such fires are caused by lightning, the only truly natural cause. In the West (the 17 Pacific and Rocky Mountain states) lightning is the primary cause, with smoking (cigarettes, matches, and such) the second most frequent. Combined they account for 50 to 75% of all wildfires. In the 13 southern states (Virginia to Texas) the primary cause is incendiary. This combined with smoking and debris burning make up 75% of the causes. The 20 eastern states have smoking and debris burning as causing close to 50% of all wildfires. Miscellaneous causes of wildfires are next in importance in most regions. The other causes of wildfires are machine use and campfires. Machine use includes railroads, logging, sawmills, and other operations using equipment.

The manner in which fuel ignites, flame develops, and fire spreads and exhibits other phenomena constitutes the field of fire behavior. Factors determining forest fire behavior may be considered under four headings: attributes of the fuel, the atmosphere, topography, and ignition. A forest fire may burn primarily in the crowns of trees and shrubs (a crown fire); primarily in the surface litter and loose debris of the forest floor and small vegetation (a surface fire); or in the organic material beneath the surface litter (a ground fire). The most common type is a surface fire.

The U.S. Forest Service has developed a National Fire Danger Rating System (NFDRS) to provide fire-control personnel with numerical ratings to help them with the tasks of fire-control planning and the suppression of specific fires. The system includes three basic indexes: an occurrence index, a burning index, and a fire load index. Each of these is related to a specific part of the fire-control job. These indexes are used by dispatchers in making decisions on setting up firefighting forces, lookout systems, and so forth.

forest fire

[′fär·əst ‚fīr]
(forestry)
Uncontrolled combustion of forest fuels.
References in periodicals archive ?
There are continuing classes and aerial training at the forest special forces, which extinguishes forest fires in hard-to-reach areas, where it is impossible to reach by land transport.
Earlier in the day, Theni District Collector (DC) had confirmed that nine people died in the forest fire.
In March 2014, a forest fire damaged a portion of Banahaw and destroyed endangered plants and killed and displaced animals.
All our thoughts are with the families and friends of those affected by the deadly forest fires that have struck several parts of Portugal.
Forest officials said most forest fire incidents were adeliberate acts.
For palm oil plantation, the president told a cabinet meeting on mitigation of forest fire.
The company added that the restart of the facility will be entirely dependent on the status of the forest fire.
However, all actors agree that the most effective way to handle forest fire issues is at the community level.
Forest Fire has spent much of the years between releases touring, crossing Europe three times last year - once supporting Phosphorescent, and twice headlining their own shows - including September's gig at the Westgarth - and playing festival dates, including the UK's End Of The Road and France's Route Du Rock.
The award-winning forest fire fighting concept car is a future prototype fire truck developed through the joint efforts of Morita Group's technical, development, and design teams.
ISLAMABAD, June 13, 2011 (Balochistan Times): The Capital Development Authority (CDA) has made comprehensive arrangements and is taking concrete measures to overcome the threats of forest fire in Margallah Hills National Park (MHNP).
Due to its present critical forest fire situation Portugal requested heavy aerial means for forest fire combat operations consisting of two water bomber planes.

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