Reef Mitigation Modules to repair damaged reef sites

Repairing damaged reefs with Reef Mitigation Modules

Deploy easy-to-build Reef Mitigation Modules with 3D designs shown to enhance coral settlement and early survival at damaged reef sites, where natural disturbances, vessel strikes, tourism-related impacts, coastal development, invasive species removal, and fishing gear can damage reefs that may recover slowly or not at all. The modules would be made with locally sourced carbonate aggregate, dried limu and grass fibers, and a lime–pozzolan binder. As corals settle and grow they build carbonate skeletons, and reef cementers such as crustose coralline algae form hard crusts that bind surfaces and rubble together; the modules are designed to gradually lose integrity as this living reef framework develops and helps stabilize the site, mimicking the natural process by which reefs build and bind their structure, with the goal of reducing the long-term presence of artificial structures on reefs. Funding would support deployment and monitoring at 5–10 key damaged reef sites selected with DAR and local partners across Hawaiʻi, with monitoring testing whether reef growth stabilizes each site before the modules break down. By taking advantage of natural larval supply, the modules could help repair and stabilize large areas of damaged reefs without requiring coral stock, such as nursery-raised corals or dislodged "corals of opportunity," and without leaving permanent structures.