Changements historiques à long terme du débit écoulé dans le Haut bassin du fleuve Sénégal

Q3 Earth and Planetary Sciences
Cheikh Faye
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Abstract

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 m3/month and in September on the downstream station with 10.99 m3/month. In return, the weakest upward trend is observed in May on the upstream station with 0.07 m3/month and in August on the downstream station with 0.67 m3/month. The annual flow also showed a significant increase upstream (with a rate of 0.35 m3/year) and downstream (with a rate of 4.53 m3/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.
塞内加尔河上游流域流量的长期历史变化
摘要在本研究中,对塞内加尔河上游流域manantali大坝两侧的流量趋势进行了评估。该评估是在1970年至2019年期间使用Sen斜率和Mann-Kendall检验进行的。Mann-Kendall趋势检验用于指示趋势的方向,而Sen斜率用于评估变化的幅度。研究结果表明,塞纳河的上游(巴宁-马卡纳站)和下游(巴克尔站)的流量在年和月间均呈上升趋势。上游站10月上升幅度最大,为4.12 m3/月,下游站9月上升幅度最大,为10.99 m3/月。上游站5月上升趋势最弱,为0.07 m3/月,下游站8月上升趋势最弱,为0.67 m3/月。年流量在上游(0.35 m3/年)和下游(4.53 m3/年)均显著增加,置信水平为99%。研究结果还表明,尽管修建了水工设施,但降水的增加会导致径流的增加。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Proceedings of the International Association of Hydrological Sciences
Proceedings of the International Association of Hydrological Sciences Earth and Planetary Sciences-Earth and Planetary Sciences (all)
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