#45 - Interception reduction from deforestation and forest fire increases large-scale fluvial flooding risk
IDRiM Podcast9 Des 2025

#45 - Interception reduction from deforestation and forest fire increases large-scale fluvial flooding risk

Abstract:

Catastrophic flooding has been noted to occur with greater frequency following deforestation, but limited observations have been available to test this connection over large spatial scales. Here we used the data of mega forest fires impacting a region of 25,000 km2 in Australia exhibiting rapid loss in forest canopy, where the runoff generation has been carefully observed with minimum anthropogenic influences for more than half a century. This provides a unique opportunity to assess the impact of the forest canopy loss on large-scale fluvial flooding. A state-controlled hypothesis test, with the climate and watershed states controlled to enhance robustness, shows a statistically significant increase in annual maximum flows resulting from the forest loss treatment. The reasoning for this natural experiment is that the forest loss impact on the interception potential of forest canopy, fallen leaves, and root-zone soils in wide region could have a recognizable impact on the fluvial flood.

Link to Paper: https://doi.org/10.1038/s43247-025-02748-6Guest:

  • Prof. Ashish Sharma [University of New South Wales, Australia]


Co-Hosts:

  • Dr. Mark Ashley Parry [Northumbria University, United Kingdom]
  • Dr. Haris Rahadianto [Lund University, Sweden]


Music:

“Sunset” by Kai Engel, available at ⁠Free Music Archive⁠, licensed under CC BY 4.0.

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