Coastal wetland rehabilitation first-pass prioritisation for blue carbon and associated co-benefits
Kerrylee Rogers
A * , Kirti K. Lal A B , Emma F. Asbridge A and Patrick G. Dwyer C
+ Author Affiliations
- Author Affiliations
A School of Earth, Atmospheric and Life Sciences, University of Wollongong, Wollongong, NSW 2522, Australia.
B Science, Economics and Insights Division, NSW Department of Planning and Environment, Lidcombe, NSW 2141, Australia.
C Coastal Systems, NSW Department of Primary Industries Fisheries, Wollongbar, NSW 2477, Australia.
Marine and Freshwater Research - https://doi.org/10.1071/MF22014
Submitted: 17 January 2022 Accepted: 13 June 2022 Published online: 26 July 2022
© 2022 The Author(s) (or their employer(s)). Published by CSIRO Publishing. This is an open access article distributed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND)
Abstract
Context: The Australian Government has developed a methodology for payment for carbon services provided by blue carbon ecosystems that focuses on avoided emissions and carbon additionality resulting from tidal restoration of coastal wetlands.
Aims: This study is a first-pass prioritisation for tidal restoration of coastal wetlands in New South Wales (NSW).
Methods: A pixel-based approach was applied using readily available datasets, with particular focus on watersheds above in-stream tidal barriers.
Key results: Many sites were identified, to investigate in detail, opportunities to restore tidal flows to coastal wetlands. More were associated with the broad coastal floodplains of northern NSW than narrower floodplains of southern NSW.
Conclusions: Information is needed about the location, ownership, land tenure, structure, condition and height of in-stream and over-land flow barriers, particularly in the context of rising sea levels. Decisions about managing in-stream drainage and flood mitigation infrastructure should be made cognisant of opportunities to increase blue carbon, and provide associated co-benefits, including mitigating other deleterious impacts from coastal wetland drainage.
Implications: Decision support tools for evaluating economic and environmental costs and benefits of tidal barriers will assist decision-makers assessing future proposals to repair or remove aging barriers, or create new tidal barriers.
Keywords: acid sulfate soils, blue carbon markets, coastal floodplains, coastal wetlands, mangroves, saltmarshes, tidal barriers, tidal reintroduction.
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