Atmospheric analogues for physically consistent scenarios of surface weather in Europe and Maghreb - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue International Journal of Climatology Année : 2017

Atmospheric analogues for physically consistent scenarios of surface weather in Europe and Maghreb

Résumé

Flash-floods are among the most devastating hazards in the Mediterranean. A major subset of damage and casualties caused by flooding is related to road submersion. Distributed hydrological nowcasting can be used for road flooding monitoring. This requires rainfall–runoff simulations at a high space and time resolution. Distributed hydrological models, such as the ISBA-TOP coupled system used in this study, are designed to simulate discharges for any cross-section of a river but they are generally calibrated for certain outlets and give deteriorated results for the sub-catchment outlets. The paper first analyses ISBA-TOP discharge simulations in the French Mediterranean region for target points different from the outlets used for calibration. The sensitivity of the model to its governing factors is examined to highlight the validity of results obtained for ungauged river sections compared with those obtained for the main gauged outlets. The use of improved model inputs is found beneficial for sub-catchments simulation. The calibration procedure however provides the parameters’ values for the main outlets only and these choices influence the simulations for ungauged catchments or sub-catchments. As a result, a new version of ISBA-TOP system without any parameter to calibrate is used to produce diagnostics relevant for quantifying the risk of road submersion. A first diagnostic is the simulated runoff spatial distribution, it provides a useful information about areas with a high risk of submersion. Then an indicator of the flood severity is given by simulated discharges presented with respect to return periods. The latter has to be used together with information about the vulnerability of road-river cross-sections.
Fichier non déposé

Dates et versions

hal-02916877 , version 1 (18-08-2020)

Identifiants

Citer

Damien Raynaud, Benoit Hingray, Isabella Zin, Sandrine Anquetin, Samuel Debionne, et al.. Atmospheric analogues for physically consistent scenarios of surface weather in Europe and Maghreb. International Journal of Climatology, 2017, 37 (4), pp.2160-2176. ⟨10.1002/joc.4844⟩. ⟨hal-02916877⟩
35 Consultations
0 Téléchargements

Altmetric

Partager

Gmail Mastodon Facebook X LinkedIn More