Essay On Bushfires

Essay On Bushfires-83
This means they pass in two to five minutes, but they can smoulder for days.Fire in the crown of the tree canopy can move rapidly.

This means they pass in two to five minutes, but they can smoulder for days.Fire in the crown of the tree canopy can move rapidly.

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Many of Australia's native plants are fire prone and very combustible, while numerous species depend on fire to regenerate.

Indigenous Australians have long used fire as a land management tool and it continues to be used to clear land for agricultural purposes and to protect properties from intense, uncontrolled fires.

When wind speeds are below this threshold, fires with heavy fuel loads burn slowly.

However, even a slight increase in wind speed above this threshold results in a significant increase in fire behaviour and advancement.

The speed of a fire front advancing will double with every 10 degree increase in slope, so that on a 20 degree slope, its speed of advance is four times greater than on flat ground.

Bushfires can originate from both human activity and natural causes with lightning the predominant natural source, accounting for about half of all ignitions in Australia.

They have a low to medium intensity and primarily damage crops, livestock and farming infrastructure, such as fences.

Bushfires are generally slower moving, but have a higher heat output.

Smaller pieces of fuel such as twigs, leaf litter and branches burn quickly, particularly when they are dry and loosely arranged and will burn quickly in the fire front.

Larger fuels, such as tree trunks often burn later after the fire front has passed.

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