Tamil Nadu's Kariyachalli Island Restoration to Combat Erosion and Boost Marine Biodiversity

The Tamil Nadu government has commenced the restoration of Kariyachalli island in the Gulf of Mannar region, a coral reef area, to combat erosion and boost marine biodiversity. The ₹50 crore project, funded by the state government and the World Bank, involves deploying 8,500 multipurpose artificial reef modules to protect and restore the eroded island and engage over 300 local community members during restoration.

Title: Tamil Nadu Commences Restoration of Kariyachalli Island to Combat Erosion and Boost Marine Biodiversity

The Tamil Nadu government has initiated the restoration of Kariyachalli Island in the Gulf of Mannar region, a significant coral reef area, to combat erosion and enhance marine biodiversity. The ₹50 crore project, funded by the state government and the World Bank, involves deploying 8,500 multipurpose artificial reef modules to protect and restore the eroded island and engage over 300 local community members during the restoration process [1].

The Gulf of Mannar, located on the southeastern coast of India, is one of the four major coral reef areas in the country. It comprises 21 uninhabited low-lying islands within the Gulf of Mannar Marine National Park, stretching 160 km between Rameswaram and Thoothukudi [1]. The surrounding coral reefs play a crucial role in protecting the mainland from coastal erosion and extreme weather, while also supporting the livelihoods of local fishermen by increasing fish production.

Kariyachalli Island, part of the Thoothukudi group, is located approximately 4 km south of Sippikulam and 20 km northeast of Thoothukudi old harbor. The island has experienced significant shrinkage over the years, with its total area reducing from 20.85 hectares in 1969 to 3.14 hectares during high tide in April 2025 [1]. The alarming erosion prompted the government to undertake the restoration project.

The restoration project, being carried out by the Tamil Nadu Forest Department in partnership with IIT-Madras and the Suganthi Devadason Marine Research Institute in Thoothukudi, aims to deploy 8,500 multipurpose artificial reef modules to protect and restore the island. These modules are designed to conserve and enhance biodiversity, address the impacts of climate change, and sustain fishery resources [1]. The project also includes the restoration of degraded coral reefs and seagrass beds, which will enhance the coral and seagrass-associated marine life and help protect the island from further erosion.

Professor S.A. Sannasiraj from the Department of Ocean Engineering noted that the layout of artificial reefs has been planned according to the island's configuration, and the fabrication of the artificial reef is currently underway. While the deployment of the modules is similar to the "Vaan" island project, the recovery process is expected to be slower due to the comparatively slower rate of degradation [1].

The director of SDMRI, J.K. Edward Patterson, emphasized that the restoration of degraded habitats such as coral reefs and seagrass beds will enhance marine life and protect the island from erosion [1]. Supriya Sahu, Additional Chief Secretary, Department of Environment, Climate Change and Forests, highlighted that environmental and social impact assessments and wave dynamics and bathymetry investigations have been conducted by IIT-Madras. The project aims to save the island from further erosion and protect nearby coasts while enhancing biodiversity, which is vital for the sustained livelihood of fishermen [1].

The project is expected to have significant environmental and economic benefits, including improved coastal protection, increased fish production, and enhanced biodiversity. The engagement of local community members in the restoration process also promises to create jobs and stimulate local economic activity.

References:
[1] https://www.thehindu.com/news/cities/Madurai/tamil-nadu-commences-restoration-of-kariyachalli-island-in-gulf-of-mannar-to-combat-erosion-and-boost-marine-biodiversity/article69751841.ece