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Study of dam break flow interaction with urban settlements over a sloping channel

Stamataki, I; Zang, J; Buldakov, E; Kjeldsen, T; Stagonas, D; (2018) Study of dam break flow interaction with urban settlements over a sloping channel. In: Paquier, A and Rivière, N, (eds.) E3S Web of Conferences: River Flow 2018 - Ninth International Conference on Fluvial Hydraulics. (pp. 06006). EDP Sciences: Lyon-Villeurbanne, France. Green open access

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Abstract

This paper describes a dam break experiment on a sloped channel, carried out in a hydraulic flume at UCL for the purpose of computer model validations of extreme events, such as flash floods. An elevated reservoir was situated upstream followed by a 1/20 slope leading up to a flat floodplain. Plexiglas blocks were positioned on the floodplain constituting different urban settlements and creating different obstructions to the flow. The flume was instrumented along its length measuring the change in water depth in the reservoir; the water depth time histories in various locations; the flow patterns and flood front velocity; and lastly the pressure and load on the buildings. The experiments were repeated for different urban settlements, flood intensities (two different initial water depths in the reservoir) and roughness layers along the slope, representative of a vegetated and a non-vegetated hill. In the present study, the experimental results were described qualitatively and compared with theoretical processes and 2D numerical results obtained using OpenFOAM's RAS turbulent model. Water depth, velocity and load measurements were analysed for different cases and it was found that while the 2D model provided a good fit on the slope, the flows generated around the building were more complex 3D formations which lead to inaccuracies. All experiments were repeated multiple times to ensure repeatability and thus the procedure was validated successfully providing a complete dataset that can be used for the validation of computational models for extreme events.

Type: Proceedings paper
Title: Study of dam break flow interaction with urban settlements over a sloping channel
Event: River Flow 2018 - Ninth International Conference on Fluvial Hydraulics
Open access status: An open access version is available from UCL Discovery
DOI: 10.1051/e3sconf/20184006006
Publisher version: https://doi.org/10.1051/e3sconf/20184006006
Language: English
Additional information: © The Authors. This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (http://creativecommons.org/licenses/by/4.0/).
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Civil, Environ and Geomatic Eng
URI: https://discovery.ucl.ac.uk/id/eprint/10058796
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