What is the most changeable factor affecting wildland fire behavior?
Wind is one of the factors of weather conditions that can influence wildland fire. Weather conditions such as wind, temperature, and humidity also contribute to fire behavior. Wind is one of the most important factors because it can bring a fresh supply of oxygen to the fire and push the fire toward a new fuel source.
What are the three elements of the wildland fire environment?
Three elements comprise the fire triangle: oxygen, heat, and fuel.
What are two effects of air movement in relation to fire behavior?
2. They alter the flow of winds causing erratic fire behavior. 3. They change the rate and direction of spread by acting like chimneys & literally propel the fire up as if through a stove pipe.
Do upslope fires create a draft?
In the absence of winds, fires usually move faster uphill than downhill, so the steeper the slope, the faster a fire moves. them sooner than they would if they were on level ground. toward new fuels. Upslope fires create a draft, increasing the ROS.
What are the three parameters of fire?
Oxygen, heat, and fuel are frequently referred to as the “fire triangle.” Add in the fourth element, the chemical reaction, and you actually have a fire “tetrahedron.” The important thing to remember is: take any of these four things away, and you will not have a fire or the fire will be extinguished.
What are the 4 main factors influencing fire spread?
Fire spread depends on the principal methods of heat transfer: conduction, convection, radiation and direct burning.
Does low humidity decrease fire activity?
Low humidity takes moisture from the fuels, and fuels in turn, take moisture from the air when the humidity is high. Light fuels, such as grass and pine needles, gain and lose moisture quickly with changes in relative humidity. When the RH drops, fire behavior increases because these fine fuels become drier.
What 3 things cause fires?
What is the difference between a control line and a Fireline?
Control line refers to all constructed or natural fire barriers. It’s also used to describe the treated fire edges used to contain the fire. A fireline is any cleared strip or portion of a control line where flammable material has been removed by scraping or digging down to mineral soil.
Which is one of the three causes of wildland fire ignition?
The three sides of the fire behavior triangle are weather, topography and fuels. Weather includes wind, temperature, cloudiness, moisture and air pressure. High temperatures and low humidity cause vegetation to dry and wildfires to burn rapidly.