Earth Surface Processes and Landforms, Journal Year: 2025, Volume and Issue: 50(3)

Published: March 12, 2025

Abstract Wood is crucial in river systems, influencing both ecological and physical dynamics. Understanding its behaviour relation to fluvial morphology essential for effective watershed management, especially after extreme events. The tendency of wood accumulate into jams (WJs) adds complexity, as these dynamics remain challenging assess. This study explored the relationship between channel morphological changes WJ mobility Blanco River, Chile, which was affected by a volcanic eruption 2008–2009. methodological approach involved utilising multi‐temporal drone surveys conducted 2018, 2019 2023, over segment with an area 29.5 ha length 2.2 km. First, characterisation units, quantification geomorphic changes, classification morphodynamic mechanisms were accomplished using orthophotos robust Digital Terrain Models (DTM) Difference (DoD). Then, abundance, spatial arrangement derived from their manual delineation 3 years. Finally, characteristics missing, newly formed, persistent WJs further analysed morphodynamics. results revealed that remains highly active, even 10–15 years post‐eruption. From 2018 at least 1.43 × 10 5 m sediment displaced, yielding value 1.21 km −2 year −1 . Most this displacement attributed floodplain erosion channel's lateral shifts. covered up 10% annually. Mobility rates 68% 78% periods 2018–2019 2019–2023, respectively. In areas no larger, less compact more likely persist. However, also associated bank deposition bars. contrast, missing or formed tended be smaller, primarily linked significant erosional depositional processes.

Language: Английский