Messager C. auteur aut IRD Gallée H. auteur aut IRD Brasseur O. auteur aut IRD Cappelaere Bernard auteur aut IRD Peugeot Christophe auteur aut IRD Séguis Luc auteur aut IRD Vauclin Michel auteur aut IRD Ramel R. auteur aut IRD Grasseau G. auteur aut IRD Léger L. auteur aut IRD Girou D. auteur aut IRD text journalArticle eng text/pdf born digital access The forcing of a hydrologic model. (ABC) by both observed and simulated precipitation from a regional climate model (MAR) has been performed over the Sirba watershed (39,000 kin 2) located in the Sahelian region. Two aspects have been more specifically examined: the spatial and temporal representations of precipitation. The comparison between simulated and observed discharges-using observed rainfall datasets as forcing of the hydrologic model-has shown that the representation of daily precipitation (which is mainly convective in the Salielian region) was not sufficiently accurate to correctly simulate the hydrologic response of the watershed. Since this response drives the soil water budget and consequently the amount of evaporation in forthcoming coupling experiments, it is thus necessary to develop more realistic infra-daily precipitation associated with convective events. A new temporal disaggregation scheme has been then developed. Considering observed as well as simulated precipitation fields, this method has significantly improved the simulated discharge at the catchment outlet. The major role played by the temporal component compared to spatial component of the precipitation has been then underlined. In addition, the present study shows the unsuitability of the simulated precipitation from the RCM to directly force a hydrologic model at infra daily timescale even if the cumulative amount and the main features of the precipitation seasonal cycle are well simulated. specialized 062 27 2-3 199-214 2006 0930-7575 https://www.documentation.ird.fr/hor/fdi:010035765 10.1007/s00382-006-0131-y 0930-7575 [F B010035765] https://www.documentation.ird.fr/hor/fdi:010035765 https://www.documentation.ird.fr/intranet/publi/2006/09/010035765.pdf Accès réservé (Intranet de l'IRD) IRD - Base Horizon / Pleins textes 2006-10-06 2017-08-23 fdi:010035765 fre