Helena Joyce
A pollution plume is a column of pollutants in the atmosphere. These can be visible or invisible columns of gas, smoke, or other substances emitted into the atmosphere. Plumes can be generated from various sources, including industrial processes, volcanic eruptions, wildfires, and everyday activities like vehicle exhaust. The behaviour of a plume refers to the movement and dispersion of these columns, which can be influenced by factors such as wind speed and direction, buoyancy, momentum, and the ambient fluid flow. The study of plumes and their behaviour is important for understanding and predicting the spread of air pollutants, and methods like computational fluid dynamics (CFD) simulations are used to model and track them.
| Characteristics | Values |
|---|---|
| Definition | A plume is a vertical body of one fluid moving through another or an invisible column of pollutants in the atmosphere. |
| Composition | Gases, smoke, particles, or a combination of both. |
| Sources | Industrial processes, volcanic eruptions, wildfires, vehicle exhaust, pesticide or insecticide spraying, etc. |
| Behavior | Fanning, fumigating, looping, coning, trapping, neutral, and lofting. |
| Dispersion | Influenced by factors such as flow in the ambient fluid, wind speed and direction, local atmospheric conditions, topographic features, and soil composition. |
| Health Impact | Can contain contaminants and carcinogens, posing risks to human health and the environment. |
| Detection and Monitoring | Employed through computational fluid dynamics (CFD) simulations and portable air quality tracking devices. |
| Treatment | Contaminated drinking water is treated to remove pollutants before reaching consumers. Cleanup efforts are managed by environmental agencies. |
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What You'll Learn
- Plumes are columns of liquid, gas, or dust, moving through another substance
- Plume behaviour refers to the movement and
- A fumigating plume is when the plume descends and spreads close to the ground
- A looping plume occurs when the emitted substance undergoes cyclical or oscillatory motion
- A coning plume is when the plume narrows or converges as it rises, resembling a cone shape
Plumes are columns of liquid, gas, or dust, moving through another substance
A plume is a column of liquid, gas, or dust, moving through another substance. In hydrodynamics, a plume or column is a vertical body of one fluid moving through another. The motion of the fluid is controlled by several effects, including momentum (inertia), diffusion, and buoyancy (density differences). Pure jets and pure plumes are flows that are driven entirely by momentum and buoyancy effects, respectively. Flows that are between these two limits are typically described as forced plumes or buoyant jets.
Buoyancy is defined as being positive when, in the absence of other forces or initial motion, the entering fluid would tend to rise. Conversely, a plume is considered negatively buoyant when the density of the plume fluid is greater than its surroundings, causing it to sink in still conditions. However, if the flow has sufficient initial momentum, it can carry the fluid vertically to some distance. As a plume moves away from its source, it typically widens due to entrainment, which is the process of the surrounding fluid mixing with the edges of the plume. The rate of entrainment is directly proportional to the local velocity.
Plumes can be generated from various sources, including industrial processes, volcanic eruptions, wildfires, and everyday activities like vehicle exhaust. They can be composed of different materials, such as gases, particles, or a combination of both. For example, in the context of air pollution, plumes refer to columns of pollutants in the atmosphere, which can be visible or invisible. The behaviour of plumes involves their movement and
Different types of plume behaviour have been identified, including fumigating, looping, coning, trapping, neutral, and lofting plumes. A fumigating plume is characterised by its descent and spread close to the ground, resulting in the widespread dispersal of the emitted substance. Looping plumes occur when the emitted substance undergoes cyclical or oscillatory motion due to variations in wind speed or direction at different altitudes. Coning plumes narrow or converge as they rise, assuming a cone shape. Trapping plumes are confined or trapped within a specific area due to local atmospheric conditions or topographic features, commonly observed in areas with strong temperature inversions. Neutral plumes exhibit minimal buoyancy effects and remain relatively stable during dispersion, typically occurring when the temperature of the emitted substances is similar to the surrounding ambient temperature. Lofting plumes, on the other hand, showcase significant buoyancy effects and rise rapidly in the atmosphere, often associated with sources that release heated gases or particles.
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Plume behaviour refers to the movement and dispersion of these plumes
Plumes are columns of air pollutants released into the atmosphere. They can be made up of gases, particles, or a combination of both. Plume behaviour refers to the movement and dispersion of these plumes.
The behaviour of a plume depends on a combination of factors, including the characteristics of the source, atmospheric conditions, and the properties of the emitted substance. For instance, the wind direction and speed can cause a plume to spread out horizontally, resulting in what is known as a fanning plume.
Plumes can also exhibit what is known as fumigation behaviour, where the plume descends and spreads close to the ground, resulting in the widespread dispersal of the emitted substance. This is often observed in pesticide or insecticide spraying activities. A looping plume occurs when the emitted substance undergoes cyclical or oscillatory motion due to variations in wind speed or direction at different altitudes.
Coning plumes occur when the emitted substance has a higher velocity at the source, causing the plume to narrow or converge as it rises, resembling a cone shape. Conversely, a trapping plume occurs when the emitted substance is confined or trapped within a specific area due to local atmospheric conditions or topographic features.
Neutral plumes have minimal buoyancy effects and remain relatively stable as they disperse. This occurs when the temperature of the emitted substances is similar to the surrounding ambient temperature. On the other hand, lofting plumes exhibit significant buoyancy effects and rise rapidly in the atmosphere due to the temperature difference between the emitted substance and the surrounding air.
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A fumigating plume is when the plume descends and spreads close to the ground
A pollution plume is a column of pollutants in the atmosphere. These can be visible or invisible columns of gas, smoke, or other substances emitted into the atmosphere. Plumes can be composed of gases, particles, or a combination of both. They are generated from various sources, including industrial processes, volcanic eruptions, wildfires, and everyday activities like vehicle exhaust.
A fumigating plume is a type of plume behaviour where the plume descends and spreads close to the ground, resulting in the widespread dispersal of the emitted substance. This behaviour is often observed in pesticide or insecticide spraying activities, where the goal is to distribute the substance across a large area for fumigation. This type of plume is influenced by changing conditions, where the plume rises and falls briefly.
Fumigating plumes are considered the most dangerous type of plume behaviour due to their widespread dispersal of substances close to the ground. They are characterised by a brief rise and fall during changing conditions, which results in the plume spreading horizontally near the ground. This is distinct from other plume behaviours, such as looping, coning, fanning, and lofting plumes, which exhibit different patterns of motion and dispersal.
Understanding fumigating plumes is crucial for effective pesticide and insecticide spraying. By studying the behaviour of these plumes, we can ensure the optimal distribution of substances across large areas. Additionally, knowledge of fumigating plumes can help us assess their potential impact on the environment and human health, especially when they are used for fumigation purposes.
Overall, a fumigating plume is a specific type of plume behaviour characterised by its descent and widespread dispersal of substances near the ground. This behaviour is significant in various applications, particularly in the context of pesticide and insecticide spraying activities.
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A looping plume occurs when the emitted substance undergoes cyclical or oscillatory motion
A plume is a column of air pollutants released into the atmosphere. These pollutants can be in the form of visible or invisible columns of gas, smoke, or other substances. Plumes can be generated from various sources, including industrial processes, volcanic eruptions, wildfires, and vehicle exhaust.
Plumes exhibit different behaviours depending on their specific characteristics and the environmental conditions in which they form. One such behaviour is known as a looping plume. This occurs when the emitted substance undergoes cyclical or oscillatory motion. In other words, the plume may rise, fall, or change direction in a looping or meandering pattern.
The formation of a looping plume is typically influenced by variations in wind speed or direction at different altitudes. These variations create conditions that cause the plume to move in a cyclical manner. This behaviour can be observed through the visible motion of the plume as it changes direction and altitude.
Looping plumes are just one type of plume behaviour. Other types include fumigating plumes, where the plume descends and spreads close to the ground, and coning plumes, where the plume narrows and converges as it rises, forming a cone shape. Each type of plume behaviour is characterised by distinct patterns of motion and dispersion, influenced by factors such as wind speed, temperature, and the properties of the emitted substance.
Understanding plume behaviour is crucial in the study of air pollution and the dispersion of pollutants. By analysing how plumes move and disperse, scientists can predict the impact of emissions on the environment and develop strategies to mitigate their effects. This knowledge is particularly important in civil engineering, where the prediction and management of plume behaviour are essential for ensuring the safety and sustainability of various industrial processes.
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A coning plume is when the plume narrows or converges as it rises, resembling a cone shape
A pollution plume is a column of air pollutants released into the atmosphere. These pollutants can be visible or invisible columns of gas, smoke, or other substances emitted into the atmosphere. Plumes can be generated from various sources, including industrial processes, volcanic eruptions, wildfires, and everyday activities like vehicle exhaust.
A coning plume is a specific type of pollution plume that occurs when the emitted substance has a higher velocity at its source, causing it to narrow and converge as it rises, resembling a cone shape. This type of plume behaviour is often observed in chimney emissions or jet engine exhausts. Coning plumes typically occur under sub-adiabatic conditions when the environmental lapse rate (ELR) is less than the adiabatic lapse rate (ALR), resulting in limited vertical mixing and a slightly stable environment. Additionally, coning plumes are associated with high wind speeds, typically exceeding 32 km/h, which contribute to their cone-like structure.
The formation of a coning plume can be influenced by various factors. One crucial factor is the velocity of the emitted substance. When the substance is released with a higher initial velocity, it tends to narrow and converge as it rises, creating the characteristic cone shape. This behaviour contrasts with the typical widening of plumes due to entrainment, where they entrain surrounding fluids at their edges as they move away from their source.
The atmospheric conditions also play a significant role in the creation of coning plumes. Under sub-adiabatic conditions, the environment exhibits slightly stable behaviour. This stability contributes to the limited vertical mixing observed in coning plumes. Additionally, the presence of high winds further shapes the plume into a cone-like structure. The combination of these factors results in the distinctive appearance of a coning plume.
It is important to note that coning plumes are just one type of plume behaviour. Other types include fanning plumes, looping plumes, trapping plumes, neutral plumes, and lofting plumes. Each type of plume behaviour is characterised by distinct patterns of dispersion, velocity, and interaction with the surrounding environment. Understanding these behaviours is crucial in fields such as civil engineering and environmental science, particularly when assessing the impact of pollution sources and designing effective mitigation strategies.
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Frequently asked questions
A pollution plume is a column of liquid, gas, or dust, moving through another substance. It is used to describe things like smoke coming out of a chimney or steam from a smokestack at a power plant.
There are several types of plumes, including fumigating, looping, coning, trapping, neutral, and lofting plumes. Each type is characterised by different behaviours and factors such as wind speed and direction, and temperature.
Pollution plumes can be caused by both human activities and natural occurrences. Human sources include the burning of fossil fuels, such as factory and vehicle exhaust, as well as household and agricultural pollution. Natural sources include wildfires, volcanic activities, dust generated by wind, and cattle or sheep passing gas.
Plume behaviour refers to the movement and dispersion of the plume. As a plume moves away from its source, it typically widens due to entrainment of the surrounding fluid at its edges. The dispersion of the plume occurs when its edges mix with the surrounding air, resulting in a lower concentration of pollutants farther away from the source.
Pollution plumes can have harmful or discomforting effects on humans and other living things. They can cause air pollution, which can be further trapped near the ground due to stable atmospheric conditions, known as inversions. This can lead to poor air quality and potential health risks for individuals living or working in affected areas.
