%0 Journal Article
%9 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES
%A Hubert, P.
%A Bader, Jean-Claude
%A Bendjoudi, H.
%T Un siècle de débits annuels du fleuve Sénégal
%D 2007
%L fdi:010069198
%G FRE
%J Hydrological Sciences Journal. Journal des Sciences Hydrologiques
%@ 0262-6667
%K Senegal ; West Africa ; time series analysis ; Hubert segmentation ; drought ; discharge ; nonstationarity ; singularity ; abrupt change
%K FLEUVE SENEGAL VALLEE ; SENEGAL ; MALI
%M ISI:000244180100005
%N 1
%P 68-73
%R 10.1623/hysj.52.1.68
%U https://www.documentation.ird.fr/hor/fdi:010069198
%V 52
%W Horizon (IRD)
%X The discharges of the Senegal River, the catchment area of which is 218 000 km(2) at the Bakel gauging station located on the Malian-Senegalese border, integrating the climatological conditions of a wide West African region, have been measured since the beginning of the 20th century. Thus, we now have a century-long time series, partially reconstituted as the river discharges have been influenced since 1987 by the Manantali Dam operation. The segmentation procedure-previously applied to a shorter time series-was applied to the 1904-2003 time series. Originating from the study of the pluviometric abrupt change observed in West Africa at the end of the 1960s, the segmentation procedure can be seen as a stationarity test enabling one to determine whether or not a time series is homogeneous (stationary) and, if not, whether it can be cut into stationary segments. This procedure has been applied in an original way, by investigating all sub-series beginning in 1904 and all sub-series finishing in 2003. This analysis, which studies the neighbourhood of the two extremities of the series, shows the pluviometric jumps already observed in the previous studies, but also shows a new positive jump between 1993 and 1994 which appears, at least for the Senegal River catchment, as the end of the drought which began at the end of the 1960s.
%$ 062