Comparison of Streamflow Estimated by Image Analysis (LSPIV) and by Hydrologic and Hydraulic Modelling on the French Riviera During November 2019 Flood
2022
Vigoureux, Sarah | Liebard, Léa-Linh | Chonoski, Aubin | Robert, Etienne | Torchet, Louis | Poveda, Valentin | Leclerc, Frédérique | Billant, Jérémy | Dumasdelage, Rémi | Rousseau, Gauthier | Delestre, Olivier | Brigode, Pierre | Ecole Polytechnice Universitaire de Nice (EPU Nice -Polytech'Nice-Sophia) ; Université Nice Sophia Antipolis (1965 - 2019) (UNS)-Université Côte d'Azur (UniCA) | Géoazur (GEOAZUR 7329) ; Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de la Côte d'Azur ; Université Côte d'Azur (UniCA)-Université Côte d'Azur (UniCA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD [Occitanie]) | Métropole Nice Côte d'Azur (NCA) | Géosciences Rennes (GR) ; Université de Rennes (UR)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Observatoire des sciences de l'environnement de Rennes (OSERen) ; Université de Rennes (UR)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Rennes 2 (UR2)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Rennes 2 (UR2)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE) | Laboratoire Jean Alexandre Dieudonné (LJAD) ; Université Nice Sophia Antipolis (1965 - 2019) (UNS)-Centre National de la Recherche Scientifique (CNRS)-Université Côte d'Azur (UniCA) | Philippe Gourbesville | Guy Caignaert
International audience
Afficher plus [+] Moins [-]anglais. Short and heavy rainstorm events often lead to flash floods on the French Riviera coastal catchments: during the historical 2nd October 2015 flood, a peak streamflow value between 185 and 295 m3/s was estimated on the Brague River at Biot at 10:30 P.M., while the streamflow was around 1 m3/s at 6:30 P.M. at the same section. If the measurements of such streamflow values are highly important (for flood statistical analysis, flood modeling, hydraulic structure design), such measurements are dangerous when they require an operator to manipulate an instrument in or near the river. Alternative methods can be used, such as video analysis, by analyzing a sequence of images and locating the displacement of patterns on the water surface. Thus, the velocity field at the flow surface can be determined and then used for estimating flow discharge on specific cross sections. In this work, we applied two different Large-Scale Particle Image Velocimetry (LSPIV) algorithms (Fudaa-LSPIV and OpyFlow) to several videos of the November 2019 floods within the Brague catchment, in order to estimate streamflow values. The obtained streamflow values have then been compared to values estimated through available observations, and also to the results of (i) rainfall-runoff modeling and (ii) hydraulic modeling on the same sections. Both LSPIV estimations, rainfall-runoff simulations and observations are coherent on the studied sections, showing the interest of combining such different and independent techniques in order to estimate flood streamflow values.
Afficher plus [+] Moins [-]Mots clés AGROVOC
Informations bibliographiques
Cette notice bibliographique a été fournie par Institut national de la recherche agronomique
Découvrez la collection de ce fournisseur de données dans AGRIS