Changements historiques à long terme du débit écoulé dans le Haut bassin du fleuve Sénégal
2021
Abstract. In this study, the flow trends on either side of the
Manantali dam, in the upper Senegal River basin, were assessed. The
assessment was carried out for the period 1970 to 2019 using the Sen slope
and the Mann-Kendall test. The Mann-Kendall trend test was used to indicate
the direction of the trends, while the Sen slope was used to assess the
magnitude of the change. The results of the study showed that there was an
upward trend in the flow of the Senegal River both annually and for every
month upstream (Bafing-Makana station) and downstream (Bakel station) from
the barrage. The strongest upward trend is noted in October on the upstream
station with 4.12 m 3 /month and in September on the downstream station with
10.99 m 3 /month. In return, the weakest upward trend is observed in May on
the upstream station with 0.07 m 3 /month and in August on the downstream
station with 0.67 m 3 /month. The annual flow also showed a significant
increase upstream (with a rate of 0.35 m 3 /year) and downstream (with a
rate of 4.53 m 3 /year) with a confidence level of 99 %. The results of
the study also showed that an increase in precipitation causes an increase
in runoff, despite the construction of hydraulic structures.
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