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Article

The Story of a Steep River: Causes and Effects of the Flash Flood on 24 July 2017 in Western Norway

Department of Civil and Environmental Engineering, Norwegian University of Science and Technology (NTNU), N-7491 Trondheim, Norway
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Academic Editors: Julio Garrote, Andres Diez-Herrero and Virginia Ruiz-Villanueva
Water 2021, 13(12), 1688; https://doi.org/10.3390/w13121688
Received: 7 May 2021 / Revised: 14 June 2021 / Accepted: 15 June 2021 / Published: 18 June 2021
(This article belongs to the Special Issue Recent Advances in Flood Hazard and Risk Science)
Flash floods can cause great geomorphological changes in ephemeral fluvial systems and result in particularly severe damages for the unprepared population exposed to it. The flash flood in the Storelva river in Utvik (western Norway) on 24 July 2017 was witnessed and documented. This study assessed the causes and effects of the 2017 flood and provides valuable information for the calibration and validation of future modelling studies. The flooded area at peak discharge, maximum wetted and dry areas during the entire event, critical points and main flow paths were reconstructed using on-site and post-event (i) visual documentation, such as photographs and videos, and (ii) aerial surveying, such as orthophotographs and laser scanning, of the lowermost reach. The steep longitudinal slope together with the loose material forming the valley and riverbed contributed to a large amount of sediment transport during this extreme event. Steep rivers such as the Storelva river have very short response times to extreme hydrologic conditions, which calls for exhaustive monitoring and data collection in case of future events, as well as modelling tools that can emulate the hydro-morphodynamics observed during events such as the 2017 flash flood. View Full-Text
Keywords: erosion and deposition processes; flash flood; historic documentation; hydrodynamics; morphodynamics; Norway; steep river erosion and deposition processes; flash flood; historic documentation; hydrodynamics; morphodynamics; Norway; steep river
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Figure 1

  • Externally hosted supplementary file 1
    Doi: 10.5281/zenodo.4739024
    Link: https://zenodo.org/record/4739024#.YMA9kvkzY2w
    Description: Dataset from "The story of a steep river: causes and effects of the 24th July 2017 flash flood in western Norway"
MDPI and ACS Style

Moraru, A.; Pavlíček, M.; Bruland, O.; Rüther, N. The Story of a Steep River: Causes and Effects of the Flash Flood on 24 July 2017 in Western Norway. Water 2021, 13, 1688. https://doi.org/10.3390/w13121688

AMA Style

Moraru A, Pavlíček M, Bruland O, Rüther N. The Story of a Steep River: Causes and Effects of the Flash Flood on 24 July 2017 in Western Norway. Water. 2021; 13(12):1688. https://doi.org/10.3390/w13121688

Chicago/Turabian Style

Moraru, Adina, Michal Pavlíček, Oddbjørn Bruland, and Nils Rüther. 2021. "The Story of a Steep River: Causes and Effects of the Flash Flood on 24 July 2017 in Western Norway" Water 13, no. 12: 1688. https://doi.org/10.3390/w13121688

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