2.4 Characteristics of veld fire
Fire is characterized by its behavior, ecology and chemical composition.
2.4.1 Fire ecology
Fire ecology is the study of the ecology and the historical role of fire and the effect that fire has on the environment, ecosystem, animals and plants (Ecological society of America 2002). Fire ecology examines the role of fire in ecosystems. Its aim is to study the origins of fire, its influence on the spread, intensity and fire relationship within an ecosystem. Besides human activities related to urban living and agricultural production, fire is the most widespread ecological disturbance in the world (Komara 1971). Africa is considered to be the fire continent because of the widespread occurrence of biomass burning particularly in the savannah. Goldammer and De Ronde (2004) stated that in most areas of the summer rainfall in south of Sahara particularly in savannah biomes, fires are mainly caused by lightning and humans.
2.4.2. Fire behavior
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When heat (just over 160 degrees Celsius) is applied to a fuel in the presence of oxygen, fire will be produced (Heikkila, 1993). Oxygen, fuel and heat are necessary elements for a fire to start, removing one element make it possible to extinguish fire. The air constitutes of 21% of oxygen and this oxygen promotes burning, when oxygen is reduced to 15% a fire is extinguished. Veld fires are primarily controlled by focusing on the fuel. The drier the fuel the more ready it is for burning. In order to ignite a fire, fuel must be brought to its ignition temperature (Heikkila et al 1993). This means that if heat falls below the ignition point, the fire goes out. Water is the most effective agent for this reduction of heat. Veld environment influences the behavior off a fire. The three elements (oxygen, fuel and heat) interact with each other to set fire behavior at a specific point and time. As oxygen, fuel, and heat changes, the behavior
The widespread effects of the fire were caused by adverse weather conditions and the origin of the fire. The months leading up to fire incorporated all the elements
Fire was thought to be bad, and wildfires were immediately suppressed. Wildfires are an important part of the ecosystem. Fire has shaped forests and grasslands for thousands of years, and many plants and animals depend on it. As human interference continued, forest health declined (Fire Ecology in Colorado). Forests here may become overgrown when fire isn’t allowed to move through.
The Triangle Fire The Triangle fire that claimed the lives of 146 people, most of them immigrant women and girls, caused an outcry against unsafe working conditions in factories. Firefighters arrived at the scene, but their ladders could only reach the 6th floor of the ten-story building, while the hose could only reach the 7th floor. Workers were trapped inside because the owners had locked the fire escape exit doors to prevent theft, so workers jumped to their deaths. The government could’ve prevented the Triangle fire earlier if they listened to the workers’ plea for a safety working environment. Union organization tried to address the employees’ working conditions but wasn’t recognized.
Historically humans havestarted fires to clear the land, suppressed wildfires, allowed fires toburn naturally, and used fire to reduce fuel loads. Records of fire scars in fossilized trees and other vegetation indicate that fires influenced ecosystems on Earth at least 350 million years ago. How fire came to be controlled and used on a daily basis by humans is
In this article the author illustrates the disadvantages of wildfires destroying not only the wildlife but the wildland. It is explained throughout the article the pros and cons and the short and long term deprivations to the wildlife. McCombie lists many different points to back up his topic and gives many sources to verify his facts. By using classical appeals the article “Hot Spots” by Brian McCombie effectively argues that wildfires can benefit and also harm wildlife.
Fire is one of the symbols that is shown in the very first scene of the movie. The large flames of the house fire that erupted when those on the reservation decided to celebrate 4th of July are shown and throughout the movie multiple representations of fire are used. In the first, and biggest fire or the movie, Thomas’ parents perish in the fire and a younger Thomas is saved by Arnold. However, Arnold says that he didn’t meant to save him. From then on throughout the movie, fire has been used in situations were liberation is occurring in so way or shape.
People who argue against prescribed fires say that it "produces to much smoke" or "there's a risk of the fire escaping". First of all, the smoke of a prescribed fire is way less than that of an uncontrolled fire. Second, the chance that the fire escapes is very slim, it usually never happens in controlled fires. Some people worry about the plant life and the soil as well, when there is no need. Usually the habitat is destroyed when an uncontrolled fire is happening, and the soil only gets effected it the fire is at a somewhat high intensity.
Fire holds a central place in this novel; it is used numerously throughout the story for good and bad reasons. On the good side, it can be used for clearing thick tree growth so sunlight can reach the forest floor and encourage the growth of native species. Also, fire frees these plants from the competition delivered by invasive weeds and eliminates diseases or droves of insects that may have been causing damage to old growth. It can also be used to help the society in solving their problems. However, this is also used for the bad in this story.
In conclusion, firefighting started from a humble background in ancient Egypt with the simple gesture of building of a pump. From there, ideas grew, and more innovations discovered that has made it an outstanding professionalism it is today. The important role that firefighting plays in the society has seen it transform over the centuries since the third century. Cities have in the past been devastated by fire outbreaks with examples being London and major cities in America. It is safe to say, if those cities had not reconsidered the importance of firefighters, then they would have seized to exist.
The Great Chicago Fire burned for two days straight. From October eighth to October tenth, 1871. There are many questions people ask about the fire. Like what "caused it to burn out of control? " People also ask about the effects the fire had on the city and its residents.
Flames wane and flicker, similar to the lives of the survivors. The ability to live on exists in carrying the fire. In contrast, the flames of a fire is a delicate art, something that may bring destruction if not carefully handled. Just as it brings warmth and life, fire brings death as well. Fire brings warmth to those who stay close to its flames, but will burn those who touch it.
California has one of the most severe wildland fire problems in the world. Population, vegetation, topography, and climate all play key roles in the probability of a wildfire occurring. In other words, it’s not a matter of “if” a wildfire will occur, but it’s a matter of “when.” In California, more and more people are choosing to live in communities near wildlands. These wildlands are composed of highly flammable vegetation which can be explosive.
Bojocco et al(2010) Reported that fire has a major role in the determination of diversity and vegetation dynamics. It has influence on landscape structural diversity (Weatherspoon and Skinner 1995). The frequent occurrence of forest fires has been one of the vital reasons for the exhaustion and extinction of most of the biodiversity. This results in partial or complete degradation of vegetation cover or fragmentation of the forest thus modifying the radiation balance by growing the surface albedo, water runoff and raising the soil erosion (Darmawan and Mulyanto, 2001). Historical study of forest fire is significant for ecological and forest management applications(Iniguez et al. 2008).