Meghan Hodges
Oil spill pollution refers to the release of liquid petroleum hydrocarbons into the environment, particularly marine ecosystems, due to human activity. Oil spills are a significant ecological threat, causing severe environmental and economic damage. They are often caused by human error, natural disasters, technical failures, or deliberate releases, impacting aquatic life, bird and mammal insulation, and the tourism and fishing industries. Oil spills can result from crude oil releases from tankers, offshore platforms, drilling rigs, wells, and pipelines, leading to adverse health effects and long-term ecological recovery. The Deepwater Horizon oil spill in 2010 is a notable example, with restoration efforts still ongoing.
| Characteristics | Values |
|---|---|
| Definition | Oil spill is the release of a liquid petroleum hydrocarbon into the environment, especially marine areas, due to human activity. |
| Causes | Human error, natural disasters, technical failures or deliberate releases. |
| Types | Marine oil spills, land-based oil spills |
| Sources | Oil tankers, offshore platforms, drilling rigs, wells, pipelines, recreational boats, runoff oil, oil from rivers, roads |
| Consequences | Environmental, economic, ecological, health |
| Impact on wildlife | Reduces insulating ability of plumage of birds and fur of mammals, harms aquatic life by reducing sunlight penetration and dissolved oxygen levels, toxic to animals if ingested, damages plant life, impacts tourism and commerce |
| Cleanup and restoration | Natural Resource Damage Assessment (NRDA), restoration projects, satellite technology |
| Notable examples | Deepwater Horizon oil spill, Gulf War Oil Spill, Kuwaiti Oil Spill |
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What You'll Learn
Causes of oil spills
Oil spills are the release of liquid petroleum hydrocarbons into the environment, particularly the marine ecosystem, and are a form of pollution. Oil spills can occur anywhere oil is drilled, transported, or used, and they are more common than most people think.
Human Causes of Oil Spills
It is estimated that 90% of oil spills are caused by humans. The most common human causes of oil spills are accidents involving tankers, barges, pipelines, refineries, drilling rigs, and storage facilities. Oil tanker spills are considered a major ecological threat due to the large amount of oil spilled per accident and the proximity of major sea trade routes to Large Marine Ecosystems.
Accidents can occur during shipping and tanker transport, with collisions between vessels damaging hulls and leading to oil leaks or spills. Vessels can also run aground, rupturing their hulls and releasing oil into the surrounding environment. Aging or poorly maintained vessels can experience structural failures, such as hull breaches or pipeline failures, resulting in oil spills.
In addition to transport accidents, oil spills can occur during the drilling process. Accidents during drilling can result in oil leaks, as seen in the Deepwater Horizon oil spill, the worst in US history, where an explosion and sinking of the drilling platform led to a massive release of oil into the Gulf of Mexico.
Recreational boats can also contribute to oil spills due to operational or human error, although these spills tend to be smaller and harder to track due to underreporting.
Natural Causes of Oil Spills
While less common, natural causes can also lead to oil spills. Natural seepage from the seafloor occurs when hydrocarbons migrate from underground reservoirs and reach the water's surface. Earthquakes or other geological events, such as volcanic eruptions, can cause fractures in the Earth's crust, allowing oil and gas to escape from reservoirs and reach water bodies.
Severe weather events like storms, hurricanes, and tsunamis can also contribute to oil spills by damaging oil infrastructure. High winds, strong currents, and rough seas can rupture pipelines, damage storage tanks, or cause vessels to run aground, resulting in oil spills.
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Environmental impact
Oil spills are the release of liquid petroleum hydrocarbons into the environment, particularly marine ecosystems, due to human activity. They are a form of pollution that can have severe environmental and economic consequences. Oil spills can occur on land or in water bodies, with marine oil spills being more common as around 90% of the world's oil transportation is through oil tankers.
The environmental impact of oil spills can be significant and far-reaching, affecting both the environment and the organisms that inhabit it. One of the primary effects of oil spills is the physical smothering of organisms, particularly those with a high viscosity, which can affect their ability to respire, feed, and regulate their body temperature. This is especially true for birds and mammals whose plumage and fur get coated in oil, making them more vulnerable to temperature changes and reducing their buoyancy in water.
Oil spills also introduce toxic chemicals such as benzenes, toluene, and poly-aromatic hydrocarbons into the environment. These chemicals can have adverse health effects when inhaled or absorbed into the bodies of humans and other organisms, causing lethal or sub-lethal toxic effects. The ecological consequences of oil spills can be severe, leading to the loss of key organisms with specific ecological functions and resulting in changes to community structures and ecological recovery. For example, the Deepwater Horizon oil spill in 2010 exposed diverse aquatic communities and had long-lasting impacts on deep-ocean corals, oyster recruitment, coastal wetlands, and populations of dolphins, sea turtles, and seabirds.
Oil spills can also have indirect environmental impacts, such as through the cleanup and recovery process, which can generate air pollutants like nitric oxides and ozone. Additionally, the use of certain cleanup techniques, such as high-pressure hot-water hoses, can cause additional harm to the environment. Oil spills in wetlands, for instance, are particularly challenging to clean and are considered one of the most sensitive habitats to oil spills.
While the number and volume of oil spills have generally declined over the years, large-scale spills continue to occur, and the recovery process can be long and challenging. The environmental impact of oil spills can vary depending on factors such as the biological and ecological attributes of the affected area, the time of year, and the clean-up techniques employed.
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Economic impact
Oil spills are the release of liquid petroleum hydrocarbons into the environment, particularly the marine ecosystem, due to human activity. Oil spills can be caused by human error, natural disasters, technical failures, or deliberate releases. They can have severe economic consequences.
The economic impact of an oil spill can be significant, affecting various industries and local economies. The financial risk of an oil spill is of immense interest to policymakers and organisations involved in funding and providing compensation, as well as determining risk and liability. The magnitude of harm from a spill depends on several factors, including the amount and type of oil, location, season, weather, and the effectiveness of the cleanup operations.
One of the most affected industries is tourism and fisheries. Negative publicity and persisting public perceptions about the impacts of oil spills can result in long-term consequences for these sectors. Oil spills can lead to closures of beaches, parks, waterways, and recreational and commercial fisheries, disrupting local economies and businesses that rely on these attractions. The cleanup and restoration costs of oil spills can also be substantial, with those responsible often being held accountable for funding these projects. Over the last 30 years, organisations like NOAA have helped recover over $9 billion from parties responsible for oil spills to restore affected areas.
Heavy industries that rely on seawater for operations can be at high risk due to oil spills, especially if their water intakes are close to the surface. Disruptions to these industries can have far-reaching effects, especially if they meet needs on a national scale. Coastal industries such as shipyards, ports, and harbours can also experience disruptions due to oil spills and subsequent cleanup operations. Smaller-scale commercial activities, such as communities reliant on salt production through seawater evaporation, can also suffer severe impacts from oil spills.
In addition, oil spills can have economic impacts on seafood resources and mariculture. The response measures and management strategies implemented to protect these resources can influence the duration, magnitude, and extent of the economic impacts. Oil spills can harm sea creatures, make seafood unsafe to eat, and disrupt the ocean ecosystem, affecting industries that depend on seafood sources.
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Health impact
Oil spill pollution can have a range of adverse health effects on humans, although the extent of these effects is not yet fully understood. This is partly because there has been a lack of long-term studies on the health impacts of oil spills, with most research focusing on short-term effects.
Direct and indirect contact with oil spills can potentially have serious consequences for humans. People who are often directly affected by oil spills include commercial fishermen, seamen, ship workers, and those living in the affected areas. Oil spills can contaminate fish species, leading to fishing restrictions as the consumption of contaminated fish can cause serious health issues. This is especially true due to the bioaccumulation of certain chemicals in the fish.
Oil spills can also have a range of physical and physiological health effects on humans. These can include skin conditions, respiratory issues, and damage to human lung cells, which can lead to problems such as heart damage, stunted growth, immune system suppression, and even death.
The toxicological properties of oil components can pose health risks to those involved in cleanup operations and coastal inhabitants. The health effects of oil spills can persist for years, and the risk of longer-term endocrine and metabolic conditions has been observed. Mental health can also be impacted, with studies finding links to acute mental health symptoms in Coast Guard Responders to the Deepwater Horizon oil spill.
The magnitude of the harm caused by an oil spill depends on various factors, including the amount and type of oil, location, season, weather, and the effectiveness of the cleanup response.
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Oil spill clean-up
Oil spills are a major ecological threat and can have severe environmental and economic consequences. They are caused by human error, natural disasters, technical failures or deliberate releases. Oil spill clean-up methods have evolved since the EXXON Valdez oil spill in Alaska in 1989, one of the worst in US history.
Shoreline Clean-up Methods
- Shoreline Flushing/Washing: Water hoses can rinse oil from the shoreline into the water, where it can be more easily collected.
- Booms: Long, floating, interconnected barriers are used to minimize the spread of spilled oil.
- Vacuums: Industrial-sized vacuum trucks can suction oil from the shoreline or on the water surface.
- Sorbents: Specialized absorbent materials act like a sponge to pick up oil but not water.
- Shoreline Cleaners & Biodegradation Agents: Chemical cleaners that act like soaps may be used to remove oil, but require special permission. Nutrients may be added to help microbes break down oil.
- Burning: Also referred to as "in situ burning," freshly spilled oil can be set on fire, usually when it's floating on the water surface and sometimes on oiled marsh vegetation, in order to effectively remove it.
- Manual Removal: Cleanup crews using shovels or other hand tools can pick up oil from the shoreline, especially when heavy machinery cannot be used.
- Mechanical Removal: When there is access, heavy machinery, such as backhoes or front-end loaders, may be used.
Open Water Clean-up Methods
- Skimming: This process uses a collection boom to concentrate oil on the water's surface, where it is then picked up by a "skimmer" and transferred to a collection tank.
- Dispersion: Chemical dispersion uses chemicals to break down the oil into small droplets that can mix into the water column and be eaten by microbes.
- In-Situ Burning: Two boats will often tow a fire-retardant collection boom to concentrate enough oil to burn.
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Frequently asked questions
An oil spill is the release of liquid petroleum hydrocarbons into the environment, especially marine areas, due to human activity. Oil spills are a form of pollution.
Oil spills can be caused by human error, natural disasters, technical failures, or deliberate releases. Oil spills may occur due to the release of crude oil from tankers, offshore platforms, drilling rigs, or wells. They may also involve spills of refined petroleum products such as gasoline and diesel fuel.
Oil spills can have severe environmental and economic consequences. They can harm aquatic life, ruin beaches, and make seafood unsafe to eat. Oil spills can also damage plant life, such as saltwater marshes and mangroves. The fishing industry is particularly vulnerable to the impacts of oil spills, often resulting in the suspension of commercial fishing activities.
