La Houille Blanche
Number 1, Février 2001
|Page(s)||62 - 70|
|Published online||01 July 2009|
Estimation de paramètres statistiques des précipitations extrêmes dans les Alpes françaises
Cemagref, Unité de Recherche Qualité et Fonctionnement hydrologique des Systèmes aquatiques, Antony
2 Laboratoire d'Etude des Transferts en Hydrologie et Environnement, UMR 5564, CNRS-INPG-ORSTOM-UJF
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Knowledge of rare-frequency rainfall laws is a prerequisite in many hydrological cases: design of engineering structures, zoning of risk area... At raingauge, this determination is possible as soon as rain data are available for long periods (minimum 10 years). The aim of this paper is to define a methodology to determine heavy rainfall characteristics, for time steps from one to 24 hours, and for the French Alps, a domain submitted to heavy rainfall. Rainfall data for the French Alps were obtained from 90 recording raingauges (apparatus for measurements at short time steps, 1 h to 24 h) and 463 daily raingauges (apparatus for daily measurements). A statistical approach allows to determine local values of statistical parameters of heavy rainfall. The methodology is based on the definition of seasons of highest rainfall risk. Indeed heavy rainfall do not have the same probability of occurrence for all seasons and all time steps.
© Société Hydrotechnique de France, 2001
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