The Critical Zone of Coastal Barrier Systems

Barrineau, Patrick; Wernette, Phillipe; Weymer, Bradley A.; Trimble, Sarah; Hammond, Brianna

doi:10.1016/b978-0-444-63369-9.00016-1

Cited by 6 publications

(2 citation statements)

References 58 publications

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“…Dune ridge sites are explored with panels B and D and show the response of the relative high points within this study area. Low‐lying areas are shown with panels A, C and E representing relatively sheltered areas of accumulation characterised by increased moisture, humus and organic surface deposits and generally different vegetation community than adjacent higher areas (Barrineau et al, 2015). Additionally, panels A and D show North and South facing slopes that have been shown to have differential regrowth patterns in post‐fire dune landscapes (Cowling & Pierce, 1988; Vestergaard & Hastings, 2001).…”

Section: Study Sitesmentioning

confidence: 99%

Post‐wildfire coastal dunefield response using photogrammetry and satellite indices

DaSilva

Bruce

Hesp

et al. 2023

Earth Surf Processes Landf

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Fire has been suggested to be an initiation mechanism of landscape instability and coastal dune transgression, but modern evidence showing a shift to a transgressive dune phase is lacking. Following the largest wildfire in historical records on Kangaroo Island, South Australia, bimonthly uncrewed aerial vehicle (UAV) surveys were conducted on three coastal dune sites to study their post‐fire responses. The three sites studied here represent the landscape diversity of the temperate dunes of Kangaroo Island with both active coastal and inland relict stabilised dune fields studied. UAV surveys were used to reconstruct landscapes with structure from motion (SfM) photogrammetry and compared over time to illustrate significant changes in the landscape. The geomorphic and vegetation changes are compared in net and intra‐survey comparisons to illustrate the post‐fire dunefield response and trends towards stabilisation. Because of a lack of reliable baseline pre‐fire data, satellite geomedians are used to compute spectral indices to show the trajectory of ground cover in the study sites in the years preceding and following the fire. Satellite indices are used to separate 3D changes according to ground cover types and show their differing post‐fire responses. Local and regional wind, temperature and rainfall records are presented to provide weather patterns of the years preceding and following the fire, illustrating the wet and mild post‐fire weather. The overall results indicate no significant landscape instability across the studied sites and that the ground cover of vegetation is nearing pre‐fire baselines, showing that a severe fire has not caused a transgressive dunefield to develop.

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Section: Study Sitesmentioning

confidence: 99%

Post‐wildfire coastal dunefield response using photogrammetry and satellite indices

DaSilva

Bruce

Hesp

et al. 2023

Earth Surf Processes Landf

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“…The negative association of index value and increasing sand percentage per pixel in Figure 10 shows that all severity values decrease as the percentage of sand per pixel increases. Figure 11 demonstrates the resulting effects of soil brightness on index value within site D. Interdune swales are low points in dune landscapes that are more sheltered environments, characterised by increased moisture, higher humus and organic surface deposits, lower wind areas, accumulation and trapping of surface water, and commonly, a different vegetation community than in adjacent higher areas, often resulting in darker soils [111]. The canopy loss is uniform within this area according to the high-resolution aerial imagery, suggesting very high severity throughout site D. The darker soils located within the interdune swale have substantially higher index values in both NBR (Figure 11) indices, contrasted to the more consistent rating of fire severity from dDI that aligns with full canopy consumption.…”

Section: Comparison With Aerial Fire Severitymentioning

confidence: 99%

A New Application of the Disturbance Index for Fire Severity in Coastal Dunes

et al. 2021

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Fires are a disturbance that can lead to short term dune destabilisation and have been suggested to be an initiation mechanism of a transgressive dune phase when paired with changing climatic conditions. Fire severity is one potential factor that could explain subsequent coastal dune destabilisations, but contemporary evidence of destabilisation following fire is lacking. In addition, the suitability of conventional satellite Earth Observation methods to detect the impacts of fire and the relative fire severity in coastal dune environments is in question. Widely applied satellite-derived burn indices (Normalised Burn Index and Normalised Difference Vegetation Index) have been suggested to underestimate the effects of fire in heterogenous landscapes or areas with sparse vegetation cover. This work assesses burn severity from high resolution aerial and Sentinel 2 satellite imagery following the 2019/2020 Black Summer fires on Kangaroo Island in South Australia, to assess the efficacy of commonly used satellite indices, and validate a new method for assessing fire severity in coastal dune systems. The results presented here show that the widely applied burn indices derived from NBR differentially assess vegetation loss and fire severity when compared in discrete soil groups across a landscape that experienced a very high severity fire. A new application of the Tasselled Cap Transformation (TCT) and Disturbance Index (DI) is presented. The differenced Disturbance Index (dDI) improves the estimation of burn severity, relative vegetation loss, and minimises the effects of differing soil conditions in the highly heterogenous landscape of Kangaroo Island. Results suggest that this new application of TCT is better suited to diverse environments like Mediterranean and semi-arid coastal regions than existing indices and can be used to better assess the effects of fire and potential remobilisation of coastal dune systems.

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