Le programme HYMEX – Connaissances et prévision des pluies intenses et crues rapides en région méditerranéenne

Ducrocq, Véronique; Boudevillain, Brice; Bouvier, Christophe; Braud, Isabelle; Fourrié, Nadia; Lebeaupin-Brossier, Cindy; Javelle, Pierre; Nuissier, Olivier; Payrastre, Olivier; Roux, Hélène; Ruin, Isabelle; Vincendon, Béatrice

doi:10.1051/lhb/2019048

Cited by 4 publications

(3 citation statements)

References 30 publications

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“…Hydraulic 2D SWE models have been applied for a long time at regional and continental scales (Pappenberger et al, 2012;Alfieri et al, 2014;Sampson et al, 2015;Dottori et al, 2016;Schumann et al, 2016) but at resolutions (100 m to 1 km) that are incompatible with the representation of small rivers (Fleischmann et al, 2019). The main factors limiting the resolution were both the availability of global highresolution DTMs (Schumann and Bates, 2018) but also the computation capacities.…”

Section: Introductionmentioning

confidence: 99%

Performance of automated methods for flash flood inundation mapping: a comparison of a digital terrain model (DTM) filling and two hydrodynamic methods

Hocini

Payrastre

Bourgin

et al. 2021

Hydrol. Earth Syst. Sci.

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Abstract. Flash floods observed in headwater catchments often cause catastrophic material and human damage worldwide. Considering the large number of small watercourses possibly affected, the use of automated methods for flood inundation mapping at a regional scale can be of great help for the identification of threatened areas and the prediction of potential impacts of these floods. An application of three mapping methods of increasing level of complexity is presented herein, including a digital terrain model (DTM) filling approach (height above nearest drainage/Manning–Strickler or HAND/MS) and two hydrodynamic methods (caRtino 1D and Floodos 2D). These methods are used to estimate the flooded areas of three major flash floods observed during the last 10 years in southeastern France, i.e., the 15 June 2010 flooding of the Argens river and its tributaries (585 km of river reaches), the 3 October 2015 flooding of small coastal rivers of the French Riviera (131 km of river reaches) and the 15 October 2018 flooding of the Aude river and its tributaries (561 km of river reaches). The common features of the three mapping approaches are their high level of automation, their application based on a high-resolution (5 m) DTM, and their reasonable computation times. Hydraulic simulations are run in steady-state regime, based on peak discharges estimated using a rainfall–runoff model preliminarily adjusted for each event. The simulation results are compared with the reported flood extent maps and the high water level marks. A clear grading of the tested methods is revealed, illustrating some limits of the HAND/MS approach and an overall better performance of hydraulic models which solve the shallow water equations. With these methods, a good retrieval of the inundated areas is illustrated by critical success index (CSI) median values close to 80 %, and the errors on water levels remain mostly below 80 cm for the 2D Floodos approach. The most important remaining errors are related to limits of the DTM, such as the lack of bathymetric information, uncertainties on embankment elevation, and possible bridge blockages not accounted for in the models.

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Section: Introductionmentioning

confidence: 99%

Performance of automated methods for flash flood inundation mapping: a comparison of a digital terrain model (DTM) filling and two hydrodynamic methods

Hocini

Payrastre

Bourgin

et al. 2021

Hydrol. Earth Syst. Sci.

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“…For this reason, well documented case studies have been selected here, both in terms of peak discharges of the flood and observed inundation patterns. Particularly, extensive sets of peak discharge estimates on ungauged river sections, gathered within the HyMeX program (Ducrocq et al, 2019), are available for each selected event. These largely complement flood discharge data that are available for a generally limited number of stream gauging stations.…”

Section: Principle Of Evaluation Based On Observed Flood Eventsmentioning

confidence: 99%

Performance of automated flood inundation mapping methods in a context of flash floods: a comparison of three methods based either on the Height Above Nearest Drainage (HAND) concept, or on 1D/2D shallow water equations

Hocini

Payrastre

Bourgin

et al. 2020

Preprint

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Abstract. Flash floods observed in headwater catchments often cause catastrophic material and human damage worldwide. Considering the large number of small watercourses possibly affected, the use of automated methods for flood inundation mapping at a regional scale can be of great help for the identification of threatened areas and the prediction of potential impacts of these floods. An application of three mapping methods of increasing level of complexity (HAND/MS, caRtino 1D, and Floodos 2D) is presented herein. These methods are used to estimate the flooded areas of three major flash floods observed during the last ten years in South-Eastern France: the 15th of June 2010 flood on the Argens river and its tributaries (585 km of river reaches), the 3rd of October 2015 flood on small coastal rivers of the French Riviera (131 km of river reaches) and the 15th of October 2018 floods on the Aude river and its tributaries (561 km of river reaches). The common features of the three mapping approaches are their high level of automation, their application based on a high-resolution (5 m) DTM, and their reasonable computation times. Hydraulic simulations are run in steady-state regime, based on peak discharges estimated using a rainfall-runoff model preliminary adjusted for each event. The simulation results are compared with the reported flood extent maps and the high water level marks. A clear grading of the tested methods is revealed, illustrating some limits of the HAND/MS approach and an overall better performance of hydraulic models solving the shallow water equations. With these methods, the inundated areas are overall well retrieved, and the errors on water levels remain mostly below 80 cm for the 2D Floodos approach. The most important remaining errors are related to limits of the digital elevation model such as the lack of bathymetric information, uncertainties on embankment elevation and to possible bridge blockages not accounted for in the models.

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“…Dans un contexte plus large, la réalisation de retours d'expériences (REX) hydro-météorologiques à la suite de crues-éclair importantes s'est généralisée depuis quelques années, tout particulièrement depuis 2010 sous l'impulsion du programme de recherche HyMeX (Ducrocq et al, 2019). Ces études, couplant analyse météorologique, hydrologique et hydraulique, permettent, en combinant mesures sur le terrain et modélisation, d'évaluer les débits de pointe ayant transité sur des tronçons jaugés et non-jaugés.…”

Section: Introductionunclassified

Inondations sur la Côte d’Azur : bilan hydro-météorologique des épisodes de 2015 et 2019

Brigode

Vigoureux

Delestre

et al. 2021

LHB

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e Voir section remerciements pour la liste complète RESUME L'objectif de cet article est de présenter un bilan hydro-météorologique des trois dernières crues majeures observées sur les petits bassins côtiers de la Côte d'Azur (3 octobre 2015, 23 novembre 2019 et 1er décembre 2019). L'analyse conjointe de données issues de pluviomètres et de différents produits de lames d'eau (PANTHERE, ANTILOPE et RAINPOL) montre que les deux épisodes du 3 octobre 2015 et du 1er décembre 2019 sont caractérisés par des intensités très importantes, avec des cumuls localement supérieurs à 100 mm en moins de 3 heures, alors que l'épisode de novembre 2019 a été moins intense et plus uniformément réparti sur l'ensemble du territoire. Les débits de pointe estimés sont du même ordre de grandeur pour les épisodes de 2015 et de décembre 2019, soit entre 10 et 20 m3/s/km² pour les têtes de bassins versants, et autour de 5 m3/s/km² pour l'aval. Ces crues s'avèrent comparables aux autres crues majeures observées ces dernières années à l'échelle européenne, sans pour autant être celles ayant produit les débits spécifiques les plus importants. Ce bilan hydro-météorologique montre la valeur ajoutée d'organisation de retours d'expérience post-crue afin d'estimer les précipitations et débits susceptibles d'être observés dans ces régions sujettes aux crues éclairs.

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Le programme HYMEX – Connaissances et prévision des pluies intenses et crues rapides en région méditerranéenne

Cited by 4 publications

References 30 publications

Performance of automated methods for flash flood inundation mapping: a comparison of a digital terrain model (DTM) filling and two hydrodynamic methods

Performance of automated methods for flash flood inundation mapping: a comparison of a digital terrain model (DTM) filling and two hydrodynamic methods

Performance of automated flood inundation mapping methods in a context of flash floods: a comparison of three methods based either on the Height Above Nearest Drainage (HAND) concept, or on 1D/2D shallow water equations

Inondations sur la Côte d’Azur : bilan hydro-météorologique des épisodes de 2015 et 2019

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