Wednesday, September 6, 2023

6B Tonnes of Sand Extracted from Oceans Annually | TOME


Title: The Devastating Impact of Dredging on Biodiversity and Coastal Communities


Dredging, the process of removing sediment and debris from the bottom of water bodies, has long been used to maintain navigable waterways and facilitate maritime activities. However, the United Nations (UN) has recently issued a warning about the detrimental effects of dredging on biodiversity and coastal communities. This article delves into the environmental consequences of dredging and highlights the urgent need for sustainable practices to mitigate its impact.

1. Understanding Dredging:

Dredging involves the excavation and removal of sediments, rocks, and other materials from the seabed or riverbed. It is primarily carried out to deepen water channels, create harbors, or extract valuable resources such as sand and gravel. While these activities are essential for economic development and trade, the scale at which dredging is being conducted is causing significant harm to marine ecosystems.

2. The Environmental Toll:

Dredging operations have a profound impact on biodiversity, disrupting delicate ecosystems and threatening numerous species. The removal of sediments can destroy critical habitats for marine organisms, including coral reefs, seagrass beds, and mangrove forests. These habitats serve as nurseries, feeding grounds, and shelter for a wide range of marine life, making their destruction particularly devastating.

3. Loss of Biodiversity:

The UN warns that the scale of dredging is leading to a loss of biodiversity in coastal areas. Many species rely on these habitats for survival, and their disappearance can disrupt entire food chains and ecological balances. The decline in biodiversity not only affects marine life but also has far-reaching consequences for human communities that depend on these ecosystems for sustenance and livelihoods.

4. Coastal Communities at Risk:

Coastal communities are directly impacted by the negative consequences of dredging. Fishing communities, in particular, suffer from reduced fish stocks and diminished catches due to the destruction of essential habitats. Additionally, the disruption of coastal ecosystems can increase the vulnerability of these communities to natural disasters such as storms and tsunamis, as the protective functions of mangroves and coral reefs are compromised.

5. Sedimentation and Water Quality:

Dredging activities often result in increased sedimentation in water bodies, leading to reduced water quality. The release of suspended sediments during dredging can smother coral reefs and seagrass beds, impairing their ability to photosynthesize and survive. Furthermore, the sedimentation can block sunlight penetration, affecting the growth of aquatic plants and reducing oxygen levels, which can be detrimental to fish and other marine organisms.

6. Sustainable Dredging Practices:

To address the environmental concerns associated with dredging, it is crucial to adopt sustainable practices. This includes conducting thorough environmental impact assessments before initiating dredging projects, implementing proper sediment management techniques, and employing innovative technologies that minimize harm to ecosystems.

7. Alternatives to Dredging:

In some cases, alternatives to traditional dredging methods can be explored. For instance, nature-based solutions like beach nourishment, which involves adding sand to eroded beaches, can help restore coastal ecosystems without causing significant harm. Additionally, sustainable coastal engineering practices that work with natural processes rather than against them can be employed to maintain navigable waterways.


The UN’s warning about the devastating impact of dredging on biodiversity and coastal communities serves as a wake-up call for the need to prioritize sustainable practices in maritime activities. By implementing environmentally conscious approaches to dredging and exploring alternatives, we can mitigate the damage caused to fragile ecosystems and ensure the long-term well-being of both marine life and coastal communities. It is imperative that governments, industries, and stakeholders collaborate to find a balance between economic development and environmental preservation.

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