Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Modeling and Risk Analysis of Dam-Break Flooding in a Semi‐Arid Montane Watershed.

Aissam Gaagai
ORCID logo ,
Hani Amir Aouissi
* ORCID logo ,
Andrey E. Krauklis
ORCID logo ,
Juris Burlakovs
,
Ali Athamena
ORCID logo ,
Ivar Zekker
,
Abderahmane Boudoukha
,
Lahcen Benaabidate
,
Haroun Chenchouni
ORCID logo
Version 1 : Received: 24 December 2021 / Approved: 28 December 2021 / Online: 28 December 2021 (18:13:16 CET)

A peer-reviewed article of this Preprint also exists.

Gaagai A, Aouissi HA, Krauklis AE, Burlakovs J, Athamena A, Zekker I, Boudoukha A, Benaabidate L, Chenchouni H. Modeling and Risk Analysis of Dam-Break Flooding in a Semi-Arid Montane Watershed: A Case Study of the Yabous Dam, Northeastern Algeria. Water. 2022; 14(5):767. https://doi.org/10.3390/w14050767 Gaagai A, Aouissi HA, Krauklis AE, Burlakovs J, Athamena A, Zekker I, Boudoukha A, Benaabidate L, Chenchouni H. Modeling and Risk Analysis of Dam-Break Flooding in a Semi-Arid Montane Watershed: A Case Study of the Yabous Dam, Northeastern Algeria. Water. 2022; 14(5):767. https://doi.org/10.3390/w14050767

Abstract

The risk related to embankment dam breaches needs to be evaluated in order to prepare emergency action plans. The physical and hydrodynamic parameters of the flood wave generated from dam-failure event correspond to various breach parameters such as width, slope and formation time. This study aimed to simulate dam-breach failure scenario of Yabous dam (NE Algeria) and analyze its influence on areas (urban and natural environments) downstream the dam. The simulation was completed using the sensitivity analysis method in order to assess the impact of breach parameters on the dam-break scenario. The propagation of flood wave associated to dam-break was simulated using the one-dimensional HEC-RAS hydraulic model. This study ap-plied a sensitivity analysis of three breach parameters (slope, width, and formation time) in five sites selected downstream the embankment dam. The simulation showed that the maximum flow of the flood wave recorded at the level of the breach was 8768 m3/s, which gradually attenuated along the river course to reach 1579.2m3/s at about 8.5km downstream the dam. This study estab-lished the map of flood-prone areas that illustrated zones threatened with the flooding wave trig-gered by the dam failure due to extreme rainfall events. The sensitivity analysis showed that flood wave flow, height and width revealed positive and similar changes for the increase in adjustments (±25% and ±50%) of breach width and slope in the 5 sites. However, flood wave parameters of breach formation time showed significant trends that changed in the opposite direction compared to breach slope and width.

Keywords

Dam breach parameters; dam failure scenario; flood hazard; flood hydrodynamics; flood simulation; simulated natural hazard

Subject

Engineering, Marine Engineering

Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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