Flashcards in Factors Favourinf Wildfires Deck (18):
Sufficient quantity of DRY vegetation 🌷
Grasses wilt during drought periods - susceptible.
Fire aids seed germination.
What veg withstands Fire?
What does the vegetation act as?
Name fuel characteristics
(Climate impacts this)
It affects frequency and duration of drought - veg dries out.
Affects type of vegetation that will grow.
Rate it will grow.
Rain also needs for plant growth but this will inhibit fires
What does climate act as?
(Worse due to global warming)
Favourable weather conditions
Storms generate lightening/ lack of rainfall - ignition.
Heatwaves / El Niño / droughts
Friends with strong winds
Name 2 types of lightening
Cold 🥶 = intense electrical current with short duration.
Hot 🥵 = lower voltage , longer duration
Name 3 things fire needs to thrive ?
Depends upon vegetation, space between fuels, wind, topography, season , temp
Dry - spread easily.
Closer fuels - more spread.
Fire breaks spreads fuels out meaning less likely to spread as quick.
However , spotting can occur.
Higher speeds more spread ( not too high or will put fire out)
Change in wind direction causes further spread
Travel faster uphill.
Summer - hotter / dryer
Higher temps absorbs moisture from fuels and makes it more dry - more conductive to catch fire
Outline how fires can be started (3 marks)
1. Ignition source needs to be established.
Lightening is the most common way natural fires are caused - linked with storms.
However, humans can ignite fires through recreational use / arson.
2. The ignition source will need to ignore a fuel.
This is dry / dense vegetation which will easily become sparked by ignition.
3. Combustion reaction occurs and fire is produced as long as fuel is present fire can thrive / spread.
4. canadas Alberta province receives many fires due to dry warm land and lightening