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Flux éolien et dynamique des front dunaires dans le Manga, sud-est du Niger

Abstract : Anthropic and climate changes reduced the vegetation cover and induced dunes movement in South-east of Niger. This work aimed to characterize wind erosion on moving dunes of the Manga in Niger. Specially, it aimed to measure wind erosion flux and to determine the velocity of the dunes fronts dynamics and the optimal period of their movement. Thus, an automatic meteorological station is installed in the village of Kilakina to direction and velocity of wind and rainfall. Metallic pickets have been installed in front of 22 dunes to measure theirs dynamics. And 3 masts of BSNE sand catcher have been installed to characterize wind erosion horizontal flux. The results show that wind erosion flux is maximal at the beginning of the rainy season while wind speeds are high. Dunes front without fixation device are more mobile. On their surfaces wind erosion happened all the year because of wind speed is regularly superior to the threshold velocity. Indeed, wind erosion flux present spatial and temporal variability which make complex thee comprehension of their dynamics.
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https://hal.ird.fr/ird-02535542
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Submitted on : Tuesday, April 7, 2020 - 4:20:28 PM
Last modification on : Tuesday, June 2, 2020 - 1:28:02 PM

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A.D. Tidjani, A. Abdourhamane Touré, Jean-Louis Rajot, B. Marticorena, C.L. Bielders, et al.. Flux éolien et dynamique des front dunaires dans le Manga, sud-est du Niger. revue ivoirienne des sciences et technologies, 2016, 28, pp.323-332. ⟨ird-02535542⟩

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