Journal
URBAN WATER JOURNAL
Volume 12, Issue 8, Pages 607-617Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/1573062X.2014.923917
Keywords
rainfall variability; 1D; 2D modelling; multifractals; space-time downscaling
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Funding
- Chair Hydrology for Resilient Cities of Ecole des Ponts ParisTech
- Veolia
- EU FP7 SMARTesT project
- EU NWE INTERREG IV RainGain Project
- EU Climate KIC Blue Green Dream
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In this paper the sensitivity to small scale unmeasured rainfall variability (i.e. at scales smaller than 1km by 1km by 5min in time, which are usually available with C-band radars) of a 1D/2D model with a 10m resolution and a semi-distributed 1D model of the same 1.47km(2) 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 12.3m in space and 18.75s 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.
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