Kiera Jefferson
Marine animals have evolved over millions of years to use sound as a primary means of communication and survival. However, human activities such as global shipping, oil and gas exploration, seismic surveys, military sonar operations, and construction have led to a significant increase in noise pollution in the ocean. This noise pollution has detrimental effects on marine life, including behavioural changes, hearing loss, and even death. To address this issue, it is essential to implement noise-reducing technologies, develop policies for quieter shipping practices, and protect biologically diverse marine regions from anthropogenic noise. By taking these steps, we can improve the ocean soundscape and enable the recovery and conservation of marine ecosystems and species.
| Characteristics | Values |
|---|---|
| Impact of noise pollution on marine life | Interferes with the detection of acoustic signals, changes in individual and social behaviour, hampers population recruitment, affects health and service functions of marine ecosystems, causes hearing loss, disrupts natural behaviour, affects communication and vocal behaviour, drives animals out of their habitat, causes death |
| Sources of noise pollution | Cargo vessels, military sonar operations, aircraft landings, construction of offshore wind farms, seismic surveys for oil and gas exploration, boats and propellers, naval exercises |
| Solutions | Reduce propeller noise from ships, mitigate sounds of sonar equipment, seismic air guns, pile driving and construction, develop quieter technologies, reduce speed of global shipping fleet, adopt quieter ship designs, use acoustic bubble curtains, manage water traffic strategically |
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What You'll Learn
Reduce propeller noise from ships
The need to reduce propeller noise from ships is becoming increasingly important as noise pollution in the ocean has seen a dramatic increase in recent decades. Marine species are highly dependent on sound for their survival, and noise pollution interferes with their key life functions. As such, it is vital to implement measures to reduce propeller noise from ships.
One effective way to reduce propeller noise is to lower the ship's speed. OceanCare, an organization advocating for quieter seas, has campaigned for a speed reduction in transport shipping. They found that a 10% decrease in speed can lead to a significant reduction in shipping noise emissions. Slowing down ships not only reduces noise pollution but also lowers greenhouse gas emissions and other air pollutants.
Another way to mitigate propeller noise is to optimize the propeller design. Propeller-induced cavitation, the formation and rapid collapse of bubbles, is a significant source of underwater sound produced by ships. This phenomenon occurs when fluid pressure drops below the vapor pressure of the water, creating steam bubbles that quickly implode, generating noise and sometimes damaging the propeller. To minimize cavitation, the International Maritime Organization (IMO) recommends selecting the appropriate propeller diameter, blade number, and blade pitch. Increasing the number of blades, for instance, distributes the workload and reduces noise levels. Additionally, modifying the pitch angle and skew of the propeller can minimize vibration and, consequently, noise.
In addition to propeller design, the overall architecture of the ship contributes to noise levels. Shipbuilding methods, including hull form, materials used, and structure performance, influence the acoustic signature of the vessel. Implementing ducts, such as the Schneekluth or Mewis duct, can help reduce turbulence and improve wake flow around the propeller, thereby reducing noise.
Furthermore, reducing propeller noise can also be achieved through operational adjustments. Lowering the Revolutions per Minute (RPM) of the propeller reduces noise as it decreases water agitation and cavitation. Balancing speed with noise output becomes crucial in managing the overall noise profile of the ship.
In conclusion, reducing propeller noise from ships is essential to mitigate the harmful effects of noise pollution on marine life. By implementing measures such as slowing down ships, optimizing propeller design, considering ship architecture, and making operational adjustments, we can significantly reduce propeller noise and contribute to the health and recovery of marine ecosystems.
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Mitigate the sounds of sonar equipment
Sonar, an acronym for Sound Navigation and Ranging, is a technology that uses acoustical waves to detect and locate objects in the ocean. There are two types of sonar: passive and active. Passive sonar is an acoustic receiver that listens to underwater sounds to detect signals of interest, such as those generated by animals, volcanoes, and ships. As it emits no sound, it has no potential to disturb marine life. Active sonar, on the other hand, emits sound signals to locate objects by the reflection of sound waves. It is used by private, commercial, and military vessels to detect objects such as submarines, fish, mines, and the sea floor.
Active sonar has been linked to noise pollution in the oceans, which can interfere with the detection of acoustic signals produced by marine wildlife, leading to changes in behaviour, metabolism, and population recruitment. For example, sonar has been recorded to alter the feeding behaviour of endangered blue whales, causing them to stop feeding, increase their swimming speed, and move away from the sound source. In another instance, 17 beaked whales were stranded off the coast of the Bahamas following naval exercises involving mid-frequency sonar, with post-mortem examinations revealing physical trauma and internal bleeding.
To mitigate the sounds of sonar equipment, several measures can be implemented:
- Reduce Sonar Usage: Limit the use of active sonar to essential operations and opt for passive sonar whenever possible as it does not emit sound and therefore does not contribute to noise pollution.
- Lower Sonar Intensity: Decrease the intensity of active sonar transmissions to reduce their impact on marine species. The strength of active sonar transmissions can be adjusted based on the designed purpose of the system and the distance of objects being detected.
- Implement Quiet Technologies: Adopt quieter ship designs and technologies to minimize underwater noise pollution. This includes modifications to hull designs and the use of quieter propellers, as encouraged by the International Maritime Organization (IMO) guidelines.
- Speed Reduction: Reduce the speed of vessels as faster ships tend to produce louder propeller noise. Slowing down the global shipping fleet by 10-20% can result in a significant reduction in noise emissions, as demonstrated by OceanCare's campaigns.
- Protected Areas: Designate biologically important marine regions as protected areas to shield them from noise pollution. For example, the waters between the Balearic Islands and the Spanish mainland were established as a marine protected area in 2018, safeguarding them from seismic surveys.
- Policy Intervention: Advocate for policies that specifically address the mitigation of propeller noise from ships and sonar equipment. Ensure that governments and international bodies prioritize noise pollution reduction in their agendas.
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Limit seismic air gun use
Seismic air guns are used to locate oil and gas deposits on the ocean floor. They are fired every ten seconds for 24 hours a day and can be used for days or weeks at a time. The noise from these air guns can penetrate thousands of meters of water and dozens to hundreds of kilometers of the seabed. This noise can cause hearing loss in marine animals, and even death in some cases.
The use of seismic air guns has significant environmental implications. According to a report by the Bureau of Ocean and Energy Management, seismic air gun testing could injure up to 138,000 whales and dolphins. The five species with the highest amount of impact are bottlenose dolphins, short-beaked common dolphins, Atlantic spotted dolphins, short-finned pilot whales, and striped dolphins.
In addition to the direct physical harm caused by seismic air guns, the noise they generate can also interfere with the natural behavior of marine mammals. For example, a study observed that dolphins maintained a greater distance from a vessel when the air gun was in use, and approached the vessel when it was not. Another study found that exposure to seismic airgun sounds caused temporary hearing loss in a harbor porpoise.
To reduce the impact of seismic air guns on marine life, it is important to implement appropriate mitigation measures and monitoring programs. For example, Exxon Neftegas Limited implemented measures to reduce the impact of a 3-D seismic survey on western gray whales during operations in 2017.
In addition to mitigation and monitoring, reducing the use of seismic air guns can also help to lessen their impact on marine life. This can be achieved through policies and regulations that limit their use or require the adoption of quieter technologies. For example, in 2018 the waters between the Balearic Islands and the Spanish mainland were designated as a marine protected area, and seismic surveys were rejected.
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Reduce construction noise
Construction noise is one of the many human activities that contribute to underwater noise pollution, which has been increasing dramatically over the last few decades. This noise pollution has detrimental effects on marine life, as many marine species depend on sound for survival.
To reduce construction noise in the ocean, several measures can be implemented:
Policies and Guidelines
International and national policies should be established to address construction noise specifically and underwater noise pollution in general. For example, the International Maritime Organization (IMO) has created voluntary noise reduction guidelines, but their non-mandatory nature has led to limited success. Therefore, mandatory policies are necessary to ensure industry-wide action.
Quieter Technologies and Techniques
Construction companies can adopt quieter technologies and techniques to reduce noise emissions. For instance, acoustic bubble curtains can be used during pile driving to dampen the noise by up to 95%. Additionally, advancements in new technologies, such as quieter propellers, can be installed on vessels to minimize noise pollution.
Slower Shipping Speeds
Reducing the speed of vessels can immediately decrease underwater noise levels. This measure not only reduces noise emissions but also lowers greenhouse gas emissions and other air pollutants.
Strategic Traffic Management
Underwater noise pollution can be mitigated by strategically managing marine traffic. For example, rerouting vessels away from sensitive areas of the marine ecosystem can lessen the impact of construction noise on vulnerable species.
Collaboration and Awareness
Collaboration between organizations, governments, industries, and conservationists is crucial to address construction noise pollution effectively. Additionally, raising awareness about the destructive effects of underwater noise can lead to more comprehensive and creative solutions.
By implementing these measures, we can work towards reducing construction noise pollution in the ocean and mitigating its harmful impacts on marine life.
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Develop quieter technologies
Developing quieter technologies is a crucial strategy to combat ocean noise pollution, which has increased dramatically over the last few decades. This noise pollution has severe negative impacts on marine wildlife, interfering with their key life functions and, in some cases, even causing death. As sound is an essential sense for marine animals to communicate, navigate, find food, and avoid predators, reducing noise emissions from human activities is vital.
One of the major contributors to ocean noise pollution is cargo vessels and shipping operations. To address this, the International Maritime Organization (IMO) has established guidelines encouraging the adoption of quieter ship designs and operations. This includes modifications to hull designs and the use of quieter, more efficient propellers, which can significantly reduce noise levels. Incentives for shipping operators to adopt quieter technologies, such as reduced port fees, can also be implemented. Additionally, slowing down the global shipping fleet by 10-20% can result in a substantial reduction in noise emissions, along with decreased greenhouse gas and air pollutant emissions.
Another source of noise pollution is the use of seismic airguns in the search for oil and gas resources in the seabed. These airguns emit extremely loud and rapid explosions that can last for extended periods, creating an "acoustic hell" for marine life. To mitigate this, the oil and gas industry is developing quieter exploration technologies, such as "marine vibroseis," which uses vibration instead of explosions to generate constant hums rather than explosive sounds. However, as highlighted by OceanCare, the best environmental practice is to avoid further exploration and production of fossil fuels, as they are incompatible with international climate goals.
In the renewable energy sector, quieter technologies are also being implemented to reduce noise pollution. For example, alternative low-noise concepts have been developed for pile driving in the construction of offshore wind farms. Bubble curtains, where compressed air flows through tubes on the seafloor, can also help mitigate the noise generated during the installation of wind turbines.
Governments play a crucial role in spurring the development and adoption of quieter technologies. For instance, Germany has set noise limits and thresholds, encouraging technological innovations and investments in quieter alternatives. Additionally, international cooperation, such as the High Ambition Coalition for a Quiet Ocean, which includes 37 countries, is vital in advancing noise reduction protocols and quieter shipping designs in marine protected areas.
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Frequently asked questions
Marine mammals and other aquatic animals have evolved to use underwater sound as a primary means of communication and survival. Noise pollution interferes with these acoustic signals, causing changes in behaviour, metabolism, and population recruitment. It can also lead to hearing loss and, in some cases, death.
The most common source of ocean noise pollution is shipping, specifically from the cavitation of boat propellers. Other sources include military sonar, aircraft landings, seismic surveys for oil and gas exploration, and the construction of offshore wind farms.
There are several measures that can be taken to reduce ocean noise pollution:
- Reducing the speed of ships can immediately decrease noise emissions.
- Implementing quieter ship designs, such as modifying hulls and using quieter propellers.
- Using alternative technologies, such as acoustic bubble curtains, to dampen noise from pile driving at offshore wind farms.
- Developing and adopting quieter technologies for seismic surveys.
