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Analyse des précipitations en hydrologie urbaine. Exemple de la Seine-Saint-Denis

Abstract : Until now, rainfall in urban hydrology has been essentially described through point measurements. Moreover, the information about the rain has been often limited to statistics of mean maximal intensities of heavy events (IDF curves), estimated by various methods. Data of dense urban raingauge networks are now available in France. This enables further researches on rainfall properties and rainfall modelling. This work is based on the analysis of a 250 station year rainfall series, measured since 1976 by the Seine-Saint-Denis county Water Authorities (Direction de l'Eau et de l'Assainissement). IDF-curve estimation methods are reviewed with an emphasis on regional analysis techniques. Results are given for frequent events with return period from several weeks to several decades. It is shown that the combination of two exponential distributions or the Pareto distribution gives rather good results for the whole frequency domain. A non-dimensional simple exponential distribution is fitted to the heaviest intensities (return period greater than 1,5 years), which does not depend on the observation space and time scales (10 - 60 minutes ; 0 -10000 hectares). The variability of the statistics with the season and the time of day has been studied, A simple description of rainfall heterogeneity is proposed under the form of a storm reduction factor. Finally, rainfall heterogeneity effects on the runoff flows are analysed on a real 1400 hectares urban watershed, with a mathematical simulation model.
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  • HAL Id : tel-00529474, version 1

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Christian Roux. Analyse des précipitations en hydrologie urbaine. Exemple de la Seine-Saint-Denis. Hydrologie. Ecole Nationale des Ponts et Chaussées, 1996. Français. ⟨tel-00529474⟩

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