Forest fire a spontaneous, uncontrolled spread of fire for forest land. Causes of forest fires can be divided into natural and anthropogenic. The most. - презентация

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2 Forest fire a spontaneous, uncontrolled spread of fire for forest land. Causes of forest fires can be divided into natural and anthropogenic. The most common natural causes of large forest fires on Earth are usually zippered.

3 The fire moves over the soil surface and burning of forest litter, grass, small branches, fallen trees and the undergrowth, burn the bottom butt part of trunks of trees. Especially the damaged spruce and fir, with a thin crust. The speed of fire at the grass- roots fire from 40 to 100 km/h Is the most common type of forest fires. At the grass-roots fire the smoke is light gray.

4 The flame covers the trees. Sea of fire is moving at a speed of 2-5 km/h, capturing large areas and bringing terrible destruction. Crown fires are the most dangerous, and the fight against them particularly difficult. Smoke when it is high fire dark grey. To extinguish such a fire with water is impossible. To fight with it to cut through a frangible break or let the incoming fire.

5 Burns the humus and peat. The fire moves at a speed of several meters a day, and often comes to the surface. The trees in the square of fire falling, creates strong clutter and increases the overall risk of fire in the future. The smoke from the underground fire is pungent, with a strong smell of peat. Edge of fire is not always visible, so there is a danger of falling into the burning peat.

6 - thrown burning match, a cigarette butt; - outstanding fire; - glow hunting wads of tow or paper; people burned grass in forest clearings, glades or stubble on the field near the forest; - a piece of glass can focus the sun's rays as incendiary lens; economic activities in the forest are in violation of the rules of TB. (Uprooting forests explosions, the burning of garbage, construction of roads). - the burning of felling logging residues careless loggers; - the burning of dry last year's grass

7 the environment of a fire; the establishment of the barrier strips and channels; annealing (front oncoming fire). Extinguish the underground peat fires are extremely difficult. This is because peat is burning in all directions of occurrence of layers. Therefore, the main method of extinguishing such a fire is burning dyking areas on all sides with a protective ditches 0.7 m width and depth to the border of the opening of the underlying peat sediment layer.

8 The work was performed by cadet 22 training group Selivanov Eugene A.