Reef enhancement for coastal protection
Building the artificial reef on rock at a time.
The Nature Conservancy
While sea walls, boulders, and other hard approaches to coastal protection are the right approach in some areas, they are also very expensive, high maintenance, and destructive to the living shoreline we all treasure. Nature-based solutions seek to integrate built structure, natural systems such as reefs, beaches, mangrove and coastal woodlands, and forests. Nature-based solutions are often much cheaper, and also provide greater benefits such as food production and beautiful places for people to recreate.
This project seeks to install reef structures designed to provide fish and coral habitat, and break wave energy and ultimately reduce coastal erosion and flooding. The design phase included detailed measurements of the seabed, wave energy modeling using data from the past sixty years, and coastal engineering. Local labor and equipment was used to install a first set of structures. The installation took a total of three weeks and constitutes one of TNC’s most important pilots to test nature based solutions to climate change.
• Community understanding the importance of and the benefits to be derived from the successful implementation of the project.
• Community acceptance, participation in the project process and ownership of the project.
• Involvement of and participation of Government Ministries and departments in the project processes.
• Partnerships with the Grenada Red Cross and NGO Grenada Fund for Conservation and other community groups that assisted with mobilizing communities and empowering stakeholders.
• Community engagement and buy-in at all stages, as well as partnerships with local organizations and community groups, was critical for successful implementation.
• Accuracy of bathymetry data available (we used satellite derived data but this lead to inaccuracies and delays during installation; access to LIDAR (Light Detection and Ranging) data would have been ideal).
• Given the experimental nature of this block phasing of installation was critical.
• Employing a local commercial dive operator and local divers was critical, during installation since the commercial diver’s experience and the divers’ knowledge of local context has been invaluable.