Post-eruption morphological evolution and vegetation dynamics of the Blanco River, southern Chile
MetadataShow full item record
In this study, we analysed the morphological evolution of a channel segment in the Blanco River in southern Chile that was affected by the Chaitén Volcano eruption occurred in 2008–2009. Through a series of high-resolution satellite images from 2005 to 2019 that represents the entire pre- and post-eruptive dynamics and land covers, we tracked the geomorphological evolution of a 5.65-km-long river segment using channel form indices and also monitored the vegetation dynamics using object-based image analysis (OBIA). Discharge record for the Blanco River was also reconstructed to support the analysis of channel morphologic process. The study aims at examining whether a) the river channel is still adjusting 10 years after the eruption and if so, at what magnitude and, b) the recovered riparian vegetation plays a significant role in stabilising the river streambanks and terraces. We found that even 10 years after the eruption, the Blanco River channel planform is still adjusting, showing a simpler and stable channel configuration in the upstream reaches of the valley, where a certain degree of equilibrium appears to have been attained. More dynamic morphologies were observed in the reaches downstream that have to accommodate the arrival of large amounts of freshly eroded sediments. Our analysis showed that the occurrence of competent floods capable of reworking the river channel matches with the geomorphic indices and mark the post-eruption adjustments of the channel. Finally, the in-channel and riparian vegetation does not play a significant role in stabilising the active channel, streambanks, and terraces, reinforcing the recolonization of sedimentary active areas occurring elsewhere in the valley.
Is part ofJournal of South American Earth Sciences, 2020, vol. 104, p. 102809
European research projects
Showing items related by title, author, creator and subject.
Influences of catchment and river channel characteristics on the magnitude and dynamics of storage and re-suspension of fine sediments in river beds Park, Jungsu; Batalla, Ramon J.; Birgand, François; Esteves, Michel; Gentile, Francesco; Harrington, Joseph R.; Navratil, Oldrich; López Tarazón, José Andrés; Vericat Querol, Damià (MDPI, 2019-04-26)Fine particles or sediments are one of the important variables that should be considered for the proper management of water quality and aquatic ecosystems. In the present study, the effect of catchment characteristics on ...
Piqué Altés, Gemma; Batalla, Ramon J.; López Alonso, Raúl; Sabater, Sergi (Elsevier, 2017-09-15)Many rivers in the Mediterranean region are regulated for urban and agricultural purposes. Reservoir presence and operation results in flow alteration and sediment discontinuity, altering the longitudinal structure of the ...
Effects of flow regulation on river bed dynamics and invertebrate communities in a Mediterranean river Lobera Galán, Gemma; Muñoz Gràcia, Isabel; López Tarazón, José Andrés; Vericat Querol, Damià; Batalla, Ramon J. (Springer International Publishing, 2016)Mediterranean rivers are hotspots for biodiversity, and riverine species are adapted to regular physical perturbations that affect channel morphology during flashy rainfall-runoff events. Dams alter flow regimes, ...