Étude Des Phénomènes Météorologiques Océaniques Et Méditerranéens Interagissant Sur La Génération Des Crues Exceptionnelles Du Bassin De La Seine À L’amont De Paris

We present the results of a study on the meteorological phenomena of oceanic and Mediterranean origins that could lead to exceptional floods in the Seine catchments upstream Paris. This analysis has been made feasible thanks to the exploitation of continuous time series during the 20(th) century of rain fall observations (MF and AESN rain gauges on more than 20 locations). In addition re-analysed meteorological fields have been used from NCEP as well as rebuilt ground pressure from WetterZentrale in order to extract the daily weather typologies from 1900 according to a simple extraction technique to sort out Mediterranean and oceanic origins of precipitations. Three studies have been conducted (meteorological fields, rain precipitation fields and hydrologic response) by using statistical analysis in both spatial and temporal dimension for the three Seine catchments upstream Paris (Yonne, Marne, Seine). Attempts have been performed to make appear causality chains between main phenomena. One interesting result is the rate flow of Seine in Paris for return period of 100 to 1000 years. In addition, perspectives given through similar use of longer time series (1850-2000) of ground pressure are presented to be applied to characterise the meteorological critical situation for the "point triple" that is the intersection location between Loire, Saone and Yonne catchments for which historical concomitant floods are known (e.g. 1866).