Influence of rainfall spatial variability on hydrological modelling: case study on two urban catchments
SCHOORENS ; EMMANUEL ; LE BALIER ; GUILLON ; FLAHAUT
Type de document
COMMUNICATION AVEC ACTES INTERNATIONAL (ACTI)
Langue
anglais
Auteur
SCHOORENS ; EMMANUEL ; LE BALIER ; GUILLON ; FLAHAUT
Résumé / Abstract
The influence of rainfall spatial variability on the modelling of a catchment response to rainfall forcing has long been a concern for hydrologists. This subject has been a motivation of the research effort devoted by hydrologists to radar rainfall measurement. The significant improvement in radar images, combined with the spread of semi-distributed and distributed hydrological models needed to take the spatial variability of rainfall into account has resulted in an increasing number of studies. Despite this research effort, the added value of considering rainfall spatial variability in hydrological modelling remains an open question from both scientific and operational points of view. This study addresses this topic through the modelling of two urban catchments of different characteristics ('Boucle de Boulogne' and Saint-Etienne catchments) using weather radar images with a high spatial resolution (250 m x 250 m radar pixels). In this study, we have made a sensitivity analysis in order to evaluate if working with 250 m radar images give different modelling results than working with 1 km images.17 rainfall events of different rainfall typology and, thus, displaying different spatial variability have been considered.
