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Article

The Morphological Evolution of a Step–Pool Stream after an Exceptional Flood and Subsequent Ordinary Flow Conditions

1
Department of Land, Environment, Agriculture and Forestry, University of Padova, 35020 Padova, Italy
2
Faculty of Engineering, Universidad Austral de Chile, Valdivia 5090000, Chile
3
RINA—Natural and Anthropogenic Risks Research Center, Universidad Austral de Chile, Valdivia 5090000, Chile
*
Author to whom correspondence should be addressed.
Academic Editors: Chang Huang, Guiping Wu and Frédéric Frappart
Water 2021, 13(24), 3630; https://doi.org/10.3390/w13243630
Received: 22 October 2021 / Revised: 15 November 2021 / Accepted: 15 December 2021 / Published: 17 December 2021
Mountain streams are frequently characterized by step–pool morphology that provides stability and energy dissipation to the channel network. Large flooding events can overturn the equilibrium of the step–pool condition by altering the entire configuration. This work focuses on the impact of the “Vaia” storm (27–30 October 2018) on a step–pool mountain stream (Rio Cordon, Northeast Italy) and on its evolution after two years of ordinary flow conditions. To achieve the aims, this work uses both remote sensing data (LiDAR and UAV) and direct field measurements (i.e., longitudinal profiles and grain sizes distributions) performed pre-event, post-event, and 2 years later (current conditions). The results show a significant widening (width +81%, area +68%) and the creation of a new avulsion after the storm and a substantial change between the number of units (51 in the pre-event, 22 post-event, and 51 in the current conditions) and characteristics of step–pool sequences between pre- and post-conditions. Furthermore, it proves the ongoing processes of morphological stabilization since the current step–pool sequences parameters are heading back to the pre-event values. Such results suggest clear susceptibility of step–pool to exceptional events and fast recovery of such setting during barely two years of ordinary flow conditions. View Full-Text
Keywords: mountain basin; Vaia storm; exceptional flood event; UAV; LiDAR; step–pool evolution; ordinary flow conditions mountain basin; Vaia storm; exceptional flood event; UAV; LiDAR; step–pool evolution; ordinary flow conditions
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MDPI and ACS Style

Pellegrini, G.; Rainato, R.; Martini, L.; Picco, L. The Morphological Evolution of a Step–Pool Stream after an Exceptional Flood and Subsequent Ordinary Flow Conditions. Water 2021, 13, 3630. https://doi.org/10.3390/w13243630

AMA Style

Pellegrini G, Rainato R, Martini L, Picco L. The Morphological Evolution of a Step–Pool Stream after an Exceptional Flood and Subsequent Ordinary Flow Conditions. Water. 2021; 13(24):3630. https://doi.org/10.3390/w13243630

Chicago/Turabian Style

Pellegrini, Giacomo, Riccardo Rainato, Lorenzo Martini, and Lorenzo Picco. 2021. "The Morphological Evolution of a Step–Pool Stream after an Exceptional Flood and Subsequent Ordinary Flow Conditions" Water 13, no. 24: 3630. https://doi.org/10.3390/w13243630

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