Evolution of Actual Evapotranspiration in the Drying Phase on Sandy Deposits in Burkinabe Sahel

Dial Niang^1, , Amadou Keita¹, Chaim Vivien Doto¹ and Hamma Yacouba¹

¹International Institute for Water and Environmental Engineering, 1, rue de la Science, 01 PO BOX 594, Ouagadougou 01, Burkina Faso

Cite this paper:
Dial Niang, Amadou Keita, Chaim Vivien Doto and Hamma Yacouba. Evolution of Actual Evapotranspiration in the Drying Phase on Sandy Deposits in Burkinabe Sahel. American Journal of Water Resources. 2019; 7(4):163-172. doi: 10.12691/ajwr-7-4-5

Abstract

This article deals with the spatio-temporal variability of actual evapotranspiration on sandy veneers in the Burkinabe Sahel characterized by a large variability of rainfall and exceptional dry conditions according to the seasons. In order to establish a water balance, a tensio-neutronic device was deployed on seven (07) sites located on three (03) surface states (Unprotected grazed area, Restored fenced area and Protected area). Results showed a difference in the behavior of the actual evapotranspiration during the drying phase on the different surface states. Indeed, the presence of superficial film (site S1) significantly limits water infiltration. On desiccation sites (S3, S5, S6 and S7) characterized by the scattered or abundant presence of vegetation, the absence of indurated superficial film creates more favorable conditions for infiltration which results in a more or less significant accumulation of water in the soil. As for the partially encrusted sites (S2 and S4), we observed an intermediate behavior with respect to the other two sites with more or less water storage in the soil.

Keywords:
dry spells soil water content soil physic evapotranspiration sahel

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