The Gulf of Mannar Marine National Park’s Kariyachalli Island is a vital biological gem that could be submerged by 2036 due to rapid erosion. Tamil Nadu launches project to save sinking Kariyachalli Island, scheduled to commence in August 2025, aimed at restoring marine habitats and stabilizing the shoreline. This blog examines the initiative’s goals, strategies, and importance for environmental preservation.

Background on Kariyachalli Island

Kariyachalli is one of 21 abandoned islands belonging to the Gulf of Mannar Marine National Park (one of the four major coral reefs of India), located on the southeast coast of India between Rameshwaram and Thoothukudi. The island has lost a significant amount of landmass from 20.85 ha (in 1969) to approximately 3.14 ha at high tide and 4.12 ha at low tide in 2024 (loss of >70%). The erosion is caused by sea rise, climate change, and degradation of coral reefs and seagrass meadows. Presently, almost one-third of the coral on the island is now bleached, making it more susceptible to erosion.

Tamil Nadu Launches Project to Save Sinking Kariyachalli Island

The Suganthi Devadason Marine Research Institute in Thoothukudi, IIT Madras, and the Tamil Nadu Forest Department are collaborating on the ₹50 crore TNSHORE project. The program is scheduled to begin in August 2025. The program will support marine biodiversity and provide some protection against erosion by restoring coral reefs, putting in artificial reef modules, and establishing seagrass beds. They have both the World Bank and the Government of Tamil Nadu supporting the project as a testament to their commitment to innovative coastal conservation.

Also Read: Florida Coral Reef Restoration: Scientists Use Nursery-Grown Coral To Restore Marine Ecosystems

Restoration Measures

As part of Tamil Nadu launches project to save sinking Kariyachalli Island, 8,500 artificial reef modules, each 2–3 meters tall and weighing 1.8–3 tonnes, will be deployed. They are made of steel and ferrocement and have perforated trapezoidal patterns. These structures, with designs adapted to the local ocean currents, are designed to maintain the shoreline, encourage sediment deposition, and lessen wave energy. To slow ocean currents and support marine life, the project will also rebuild four acres of seagrass beds and three acres of coral reefs using native, bleaching-resistant species. To promote sustainable livelihoods, local populations from neighboring villages, such as Sippikulam and Pattinamaruthoor, will receive training to assist with reef deployment and ecological monitoring.

Also Read: More Than 80% Of World’s Reefs Affected In Worst Global Coral Bleaching Event On Record

Ecological and Community Benefits

The restoration efforts aim to enhance the biodiversity of the Gulf of Mannar, which is home to over 4,300 marine species, including the seagrass-dependent, endangered dugong. Seagrass beds and healthy coral reefs will improve carbon sequestration and protect from storms and tsunamis, as demonstrated by the 2004 tsunami.

Building on the success of comparable initiatives at Van Island, where land area and coral cover increased significantly, Tamil Nadu launches a project to save the sinking Kariyachalli Island, and this initiative will protect fishing resources and generate income for residents through eco-tourism and conservation activities.

Challenges and Considerations

The restoration of Kariyachalli Island is complicated by slow coral growth and the time it often takes before the effects of the restoration are realized. It will require significant monitoring, in light of some of the ongoing risks associated with climate change, including coral bleaching and warm sea temperatures, before it is possible to evaluate the impact of any restoration initiatives. Other potential complications to the success of these efforts may stem from invasive species or injuries caused by rodents, as has been observed in past restoration attempts. The most pertinent issue will always be addressing ecological goals while promoting sustainable human efforts.

Also Read: Coral Diseases Ravage Caribbean Reefs, Threatening Vital Staghorn And Elkhorn Populations

Broader Implications

The TNSHORE will provide additional support to the Tamil Nadu Coastal Restoration Mission, with a total investment of ₹1,675 crore, spanning 2024-2029, and can serve as a basis for the restoration of other vulnerable islands, including Kasuwari. By also addressing climate-induced issues, the initiative supports global marine protection initiatives. It is similarly essential that “we” can highlight the significance of partnerships, like with the World Bank, for climate resilience.

Final Words

Tamil Nadu launches project to save sinking Kariyachalli Island is a daring effort to save the island from sinking while maintaining its ecological and commercial significance. The initiative establishes a standard for sustainable coastal management by fusing creative restoration methods with community involvement. As the project progresses, it inspires global efforts to conserve marine habitats and offers hope for halting environmental degradation. Supporting such initiatives is vital to ensure a robust future for coastal communities and wildlife.

Also Read: Eleven Nations Unite In Pioneering Pact To Safeguard Climate-Resilient Coral Reefs