Hubert P., Bader Jean-Claude, Bendjoudi H. (2007). Un siècle de débits annuels du fleuve Sénégal. Hydrological Sciences Journal. Journal des Sciences Hydrologiques, 52 (1), p. 68-73. ISSN 0262-6667.
Hydrological Sciences Journal. Journal des Sciences Hydrologiques, 2007,
52 (1), p. 68-73 ISSN 0262-6667
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.
