%0 Journal Article %T Impacts of small scale rainfall variability in urban areas: a case study with 1D and 1D/2D hydrological models in a multifractal framework %+ Hydrologie, Météorologie et Complexité (HM&Co) %+ Laboratoire Eau Environnement et Systèmes Urbains (LEESU) %+ Department of Physics [Montréal] %+ Centre de recherche sur la dynamique du système Terre (GEOTOP) %A Gires, Auguste %A Giangola-Murzyn, A. %A Abbes, J. B. %A Tchiguirinskaia, Ioulia %A Schertzer, D %A Lovejoy, S. %< avec comité de lecture %@ 1573-062X %J Urban Water Journal %I Taylor & Francis %V 12 %N 8 %P 607-617 %8 2015 %D 2015 %R 10.1080/1573062x.2014.923917 %Z Environmental Sciences %Z Sciences of the Universe [physics]/Earth Sciences/HydrologyJournal articles %X In this paper the sensitivity to small scale unmeasured rainfall variability (i.e. at scales smaller than 1 km by 1 km by 5 min in time, which are usually available with C-band radars) of a 1D/2D model with a 10 m resolution and a semi-distributed 1D model of the same 1.47 km2 urban area is analyzed. The 1D/2D model is the open source numerical platform Multi-Hydro, which couples (open source) distributed models of involved hydrological/hydraulic processes. The methodology implemented to evaluate the uncertainties consists of generating an ensemble of realistic rainfall fields downscaled to a resolution of 12.3 m in space and 18.75 s in time with the help of a stochastic universal multifractal model. The corresponding ensemble of hydrographs is then simulated. It appears that the uncertainty is significant and that Multi-Hydro unveils much more uncertainty than the simpler 1D model. This points out a need to develop high resolution distributed modelling in urban areas. © 2014 Taylor & Francis. %G English %2 https://enpc.hal.science/hal-01238347/document %2 https://enpc.hal.science/hal-01238347/file/Gires_et_al_Urban_Wat_J_2013_R2_postprint.pdf %L hal-01238347 %U https://enpc.hal.science/hal-01238347 %~ SDE %~ AGROPARISTECH %~ ENPC %~ PARISTECH %~ ENPC-LEESU %~ GIP-BE %~ UPEC %~ HMCO %~ AGREENIUM