Abstract
In a fluvial environment, the main role of levees is to canalise water downstream of rivers and to reduce the risk of flooding in nearby areas. Levee failure can be either structural or hydraulic. Structural failure occurs where a breach in a flood defence system leads to the inundation of the protected area whereas hydraulic failure refers to flooding before the designed protection level is attained and without prior damage to the flood defence system. Nowadays, hydrodynamic modelling codes are able to perform hydraulic failure such as overflowing by means of any appropriate weir equation, however, only a few allow to simulate structural failure. HEC-RAS can do both and enables to model levee breaches with a simple but flexible parametric module. The aim of our study is to evaluate the capacity of a 1D hydraulic model to represent levees breaches and subsequent flooding. To do so, a 1D storage area model is built with HEC-RAS and calibrated using data provided by the ‘Benchmark Garonne’ project initiated by EDF. The study case is based on the 1981 historical flood event of the Garonne River between Tonneins and La Réole (Sect. 2). The model is introduced and compared to two other hydraulic models used in the benchmark (Sect. 3). Two sensitivity analyses with respect to sets of hydraulic parameters and levee breach parameters are carried out (Sect. 4). Results expressed as maximum water levels show that the main channel roughness coefficient and the final breach width are the most influencing model parameters, respectively. Levee breaches appear to be a non-negligible source of uncertainty in hydraulic modelling, comparable to uncertainties arising from model structure or model calibration. In order to improve our modelling approach, a ground survey and a literature survey is conducted to collect data about the breaches that occurred in the study area, in particular, during the 1981 flood (Sect. 5). Historical evidence shows that a significant number of breaches occurred since 1875.
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References
Allsop, W. (2007). Failure mechanisms for flood defence assets. Oxford: HR Wallingford.
Morris, M. (2009). Breaching processes: A state of the art review. Oxford: HR Wallingford.
Wahl, T. L. (2004). Uncertainty of predictions of embankment dam breach parameters. Journal of Hydraulic Engineering, 130(5), 389–397.
Alliau, D. et al. (2015). Flood study of industrial site by extreme flood risk: Uncertainties with hydrologic and hydraulic extreme values. La Houille Blanche, 2, 67–74.
Mazzoleni, M. et al. (2013). Flooding hazard mapping in floodplain areas affected by piping breaches in the Po River, Italy. Journal of Hydrologic Engineering, 19(4), 717–731.
Vorogushyn, S. et al. (2010). A new methodology for flood hazard assessment considering dike breaches. Water Resources Research, 46. doi:https://doi.org/10.1029/2009WR008475.
Brunner, G. (2016). HEC-RAS, River analysis system hydraulic reference manual. US Army Corps of Engineers—Hydrologic Engineering Center, Davis, CA, USA.
Brunner, G. (2016). HEC-RAS, River analysis system hydraulic reference manual. US Army Corps of Engineers—Hydrologic Engineering Center, Davis, CA, USA.
Di Baldassarre, G., Castellarin, A., & Brath, A. (2009). Analysis of the effects of levee heightening on flood propagation: example of the River Po, Italy. Hydrological Sciences Journal, 54(6), 1007–1017.
SMEPAG. (1989). Monographie des crues de la Garonne (du Pont du Roy au Bec d’Ambès)—2 tomes [Monograph of the Garonne floods (from Pont du Roy to Bec d’Ambès)—2 volumes].
LPCB. (1983). Vallée de la Garonne—Enquête sur les ruptures de digues de Décembre 1981 entre Meilhan et Port Sainte Marie [Garonne Valley—Investigation on the dike breaches of December 1981 between Meilhan and Port Sainte Marie].
Besnard, A., & Goutal, N. (2011). Comparison between 1D and 2D models for hydraulic modeling of a floodplain: Case of Garonne River. La Houille Blanche, 3, 42–47.
Bozzi, S. et al. (2015). Roughness and Discharge Uncertainty in 1D Water Level Calculations. Environmental Modeling & Assessment, 20(4), 343–353. doi:https://doi.org/10.1007/s10666-014-9430-6.
Pappenberger, F. et al. (2005). Uncertainty in the calibration of effective roughness parameters in HEC-RAS using inundation and downstream level observations. Journal of Hydrology, 302(1), 46–69.
Brunner, G. (2016). HEC-RAS, River Analysis System User’s Manual, version 5.0. US Army Corps of Engineers, Institute For Water Resources, Hydrologic Engineering Center, Davis, CA, USA.
Goodell, C. (2014). Breaking the HEC-RAS Code: A User’s Guide to Automating HEC-RAS. h2ls.
CETMEF. (2005). Notice sur les déversoirs—Synthèse des lois d’écoulement au droit des seuils et déversoirs [Note on weirs—Synthesis of sill and weir flow laws].
Fernandes, J., Leal, J., & Cardoso, A. (2012). Flow structure in a compound channel with smooth and rough floodplains. European Water, 38, 3–12.
Wu, W. (2011). Earthen Embankment Breaching. Journal of hydraulic engineering, 137(12). doi:https://doi.org/10.1061/(ASCE)HY.1943-7900.0000498.
Hall, J.W. & al. (2003). A methodology for national-scale flood risk assessment. In Proceedings of the Institution of Civil Engineers-Water Maritime and Engineering, 235–248.
De Bruijn, K., Diermanse, F., & Beckers, J. (2014). An advanced method for flood risk analysis in river deltas, applied to societal flood fatality risk in the Netherlands. Natural Hazards and Earth System Sciences, 14(10), 2767.
Bacchi, V. et al. (2017). Feedback from uncertainties propagation research projects conducted in different hydraulic fields; outcomes for engineering projects and nuclear safety assessment. In SimHydro 2017, 14–16 June 2017, Sophia Antipolis—Nice (France).
Nguyen, T. et al. (2015). Uncertainties propagations in 1D hydraulic modeling. La Houille Blanche, 5, 55–62.
Abily, M. et al. (2016). Spatial global sensitivity analysis of high resolution classified topographic data use in 2D urban flood modelling. Environmental Modelling & Software, 77, 183–195.
R Core Team. (2016). R: A langage and environment for statistical computing. R Foundation for Statistical Computing. Available from http://www.R-project.org.
Acknowledgements
This work could not have been carried out without the organization of the ‘Benchmark Garonne’ project by EDF. The authors would like to thank especially Nicole Goutal and all researchers implied in the project for data provided and rewarding technical exchanges during this project.
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Bertrand, N., Liquet, M., Moiriat, D., Bardet, L., Duluc, CM. (2018). Uncertainties of a 1D Hydraulic Model with Levee Breaches: The Benchmark Garonne. In: Gourbesville, P., Cunge, J., Caignaert, G. (eds) Advances in Hydroinformatics . Springer Water. Springer, Singapore. https://doi.org/10.1007/978-981-10-7218-5_13
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