Spring flood analysis using the flood-duration-frequency approach: Application to the provinces of Quebec and Ontario, Canada
Analyse des crues de printemps en utilisant l'approche débit-durée-fréquence : application aux provinces du Québec et de l'Ontario, Canada
Javelle, P. ; Ouarda, T.B.M.J., ; Bobée, B.
Type de document
Article de revue scientifique à comité de lecture
Affiliation de l'auteur
CEMAGREF AIX EN PROVENCE UR OHAX FRA ; INRS-EAU UNIVERSITY OF QUEBEC SAINTE-FOY CAN ; INRS-EAU UNIVERSITY OF QUEBEC SAINTE-FOY CAN
Résumé / Abstract
Most often, flood frequency analysis describes a flood event only by its peak. However, the true flood severity is also defined by its volume and duration. This paper presents an approach allowing flood events to be considered in a more complete way: the flood-duration–frequency (QdF) approach. In a similar manner to the rainfall intensity–duration–frequency analysis, averaged discharges are computed over different fixed durations d. For each duration a frequency distribution of maximum averaged discharges is studied. Finally, a continuous formulation is fitted, as a function of the return period T and the duration d over which discharges have been averaged. The proposed model has been tested for 169 catchments in the provinces of Quebec and Ontario, Canada. The shapes of the QdF curves enabled us to define different types of flood behaviour and to identify the corresponding geographic regions. This mapping of flood behaviour was the basis for the delineation of seven homogeneous geographical regions, containing catchments having the same hydrological behaviour as is required for regional flood frequency analysis.
Hydrological Processes, vol. 17, p. 3717 - 3736