Modelling the removal of an earth bund to maximise seawater ingress into a coastal wetland

Karim, Fazlul; Wallace, Jim; Abbott, Brett N.; Nicholas, Michael; Waltham, Nathan J.

doi:10.1016/j.ecss.2021.107626

Cited by 8 publications

(1 citation statement)

References 45 publications

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“…Increasing coastal wetland reserves may precede reintroduction of tides and, in many cases, tidal reintroduction is likely to be simpler on publicly owned land (Bell-James and Lovelock 2019b). However, achieving optimal blue carbon services and co-benefits not only requires consideration of tenure including Native Title, and landuse, but may also require interventions to ensure restoration of hydrological regimes affected by drainage, delivery of ecosystem services and adaptations to sea-level rise (Abbott et al 2020;Karim et al 2021;Sadat-Noori et al 2021). This is because past agricultural land-use can remain imprinted on coastal wetlands for decades or centuries, with evidence of past drainage, structures and fencing retained in, and sometimes continuing to degrade, post-agricultural landscapes (Williams and Watford 1997;MacDonald et al 2010).…”

Section: Influence Of Barriers and Opportunities For Improving Blue C...mentioning

confidence: 99%

Coastal wetland rehabilitation first-pass prioritisation for blue carbon and associated co-benefits

et al. 2022

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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 firstpass 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.

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Section: Influence Of Barriers and Opportunities For Improving Blue C...mentioning

confidence: 99%

Coastal wetland rehabilitation first-pass prioritisation for blue carbon and associated co-benefits

et al. 2022

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Assessing Tidal Hydrodynamics in a Tropical Seascape Using Structure‐from‐Motion Photogrammetry and 2D Flow Modelling

Vulliet,

Koci,

Jarihani

et al. 2023

Estuaries and Coasts

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Tidal wetlands continue to be threatened by changes in seascape hydrological regime and connectivity resulting from human activities (e.g. urbanisation, engineered barriers) and climate change. Reliable and parsimonious models that can be used by managers and practitioners to simulation tidal wetland hydroperiod dynamics (duration, depth, and frequency of tidal inundation) at high-resolution are limited presumably because these ecosystems have very low elevation across their flooding plain. Here, we developed a two-dimensional hydrodynamic model parameterised using a high-resolution (3 cm) and accurate (8-cm RMSE elevation error) digital elevation model (DEM) and land cover map (2-cm resolution) derived from unoccupied aerial vehicles (UAVs) structure from motion photogrammetry (SfM) to assist in the understanding of tidal wetland hydroperiod and hydrological connectivity of an upper tidal Australian tropical seascape. Ground-based water level datasets were used to calibrate and validate the model with higher accuracy (RMSE = 7 cm between maximum observed and simulated depth). The high-resolution approach demonstrates how small changes in topography such as vehicle tracks can interfere with hydrological connectivity. Centimetre-changes in tidal height resulted in important variations (10 ha) in the total area of the wetland being inundated, suggesting that small anthropogenic modifications of tidal inputs (e.g. culverts and sea-level rise) might have important implications on tidal wetland inundation patterns. Despite challenges related to reconstructing topography in densely vegetated areas and obtaining bathymetric data, the method developed here represents an accurate and cost-effective approach to quantify tidal wetland hydroperiod. This approach assists in planning, defining, and implementing effective and measurable restoration and protection projects of tidal wetland ecosystems. Graphical Abstract

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Lessons learned on the feasibility of coastal wetland restoration for blue carbon and co-benefits in Australia

Hagger,

Stewart-Sinclair,

Rossini

et al. 2024

Journal of Environmental Management

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Modelling the removal of an earth bund to maximise seawater ingress into a coastal wetland

Cited by 8 publications

References 45 publications

Coastal wetland rehabilitation first-pass prioritisation for blue carbon and associated co-benefits

Coastal wetland rehabilitation first-pass prioritisation for blue carbon and associated co-benefits

Assessing Tidal Hydrodynamics in a Tropical Seascape Using Structure‐from‐Motion Photogrammetry and 2D Flow Modelling

Lessons learned on the feasibility of coastal wetland restoration for blue carbon and co-benefits in Australia

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