This talk covers a project looking at the recovery of coastal dunes on Kangaroo Island that were affected by fires in 2019-2020. Fires are suggested to be a trigger for landscape instability and dune transgression, but contemporary evidence is lacking. The results of repeat UAV and vegetation surveys are covered, and a new satellite index derived from the Tasselled Cap Transform (TCT) for assessing burn severity is discussed.
Fires remove vegetation and biomass cover and have been suggested to be a trigger for landscape instability and possibly an initiator of a transgressive dune phase.
After the 2019-2020 fires on Kangaroo Island, a large portion of Holocene sands and coastal dunes were visible from space in satellite imagery. The post-fire state of the dunefields on the ground suggested a very high severity and intensity burn, with vegetation completely consumed by fire.
Conventional satellite derived indices and desktop studies showed that the fire severity was medium to low in these regions, a clear divergence compared to in-situ observations. High resolution 4 band aerial imagery is used to quantify and explain how widely applied burn severity indices under-assess heterogenous landscapes and an alternative method is presented here based on the Tasselled Cap Transformation (TCT) for Sentinel 2 imagery.
Field work from June 2020 to present has monitored the recovery of three representative burnt dunefields with repeat UAV and vegetation surveys, showing the recovery path of these dynamic landscapes in morphology, plant diversity/succession and stability.
Mr Marcio DaSilva (Flinders University)
Time & room
2:45 pm–3:00 pm
City Room 2
Date & venue
Friday 17 September 2021 at the Adelaide Convention Centre