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3rd IAHR Young Professionals Congress (29 November –1 December 2022)
Abstract The maximum inundation area, critical locations, and flow paths in the wetted area of a flash flood in a steep river were reconstructed using remote sensing combined with
post-event field investigation and soft data. The soft data contrasted with control points and used to assemble the flood extension included newspaper articles, photographs and videos
taken during the flood, and witness testimonies. The soft data provided insights on the flood dynamics that were not available with remote sensing and post-event field observations
alone. The outcome of this investigation could be used to calibrate and/or validate numerical models, as well as to improve the accuracy of flood early warning systems.
Keywords: field observations, flash floods, remote sensing, soft data, steep rivers.
Methods Conclusions
The role of soft data to understand flood dynamics
in an ephemeral mountain river
Adina Moraru YP1*
1Norwegian University of Science and Technology (NTNU), Trondheim, Norway *Correspondence YP: adina.moraru@ntnu.no
References
Bruland, O. (2020). How extreme can unit discharge become in
steep Norwegian catchments? Hydrology Research,51(2), 290–
307.https://doi.org/10.2166/nh.2020.055
Moraru, A., Pavlíček, M., Bruland, O. and Rüther, N. (2021). The
story of a steep river: causes and effects of the flash flood on 24
July 2017 in western Norway. Water (Switzerland),13(12), 1688.
https://doi.org/10.3390/w13121688
The combined use of soft data obtained during the 2017
flash flood with aerial surveying provided information on:
•critical locations,
•flow paths and
•maximum inundation area.
Most trace of this event disappeared with the quick
restoration work, making these findings important to
understand the flood dynamics in an ephemeral mountain
river in a Nordic region. The dataset presented in this
study can be used to calibrate and validate numerical
models, and to improve the accuracy of flood early
warning systems.
Results
Figure 1: Workflow followed to obtain the flooded area
at Qpeak (a), critical locations (b), flow paths (c) and
maximum inundation area (d) during the 2017 flash
flood (modified after Moraru et al., 2021). Extended abstract More results WoWW project
Figure 2: Maximum inundation area (blue area), critical
locations (CL1‒4, white circles) and the flow paths
(purple lines) during the 2017 flash flood (modified
after Moraru et al., 2021).
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