Overview
This method enables ACCUs to be generated for projects that involve removal or modification of a tidal barrier in order to restore tidal flows to coastal wetlands.
The science
When tidal flow is blocked by levees or bunds, wetlands dry out and soil carbon oxidises, releasing CO₂. Restoring tidal inundation reintroduces saline water and organic-rich sediments that encourage wetland vegetation to regrow. These plants, including mangroves, trap sediments and organic matter, while low-oxygen (anaerobic) conditions slow decomposition, allowing carbon to accumulate in soils for centuries.
Key Project Steps
- Assess project eligibility and prepare necessary plans and approvals.
- Register the project with the Clean Energy Regulator.
- Remove or modify tidal gates or barriers to reintroduce tidal flow.
- Estimate carbon gains using the BlueCAM model
- Monitor vegetation recovery and hydrology and report on project abatement.
- Maintain long-term site integrity to prevent carbon loss.
Co-Benefits
Projects using this method can:
- Strengthen coastal protection against erosion and storms.
- Restore habitat for fish and birds.
- Improve water quality and biodiversity.
Find out more about the tidal restoration of blue carbon ecosystems method.