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

Copyright

This work is licensed under a Creative Commons Attribution 4.0 International License. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

References

[1]	Mahé, G. and Paturel, J., 1896-2006 Sahelian annual rainfall variability and runoff increase of Sahelian Rivers, Comptes Rendus Geosciences, 341(7), 538-546, 2009.
[2]	Niasse, M., Afouda, A., Amani, A., Réduire la vulnérabilité de l’Afrique de l’Ouest aux impacts du climat sur les ressources en eau, les zones humides et la désertification: éléments de stratégie régionale de préparation et d’adaptation, Iucn, Gland, Cambridge, Royaume-Uni; 2004.
[3]	Sivakumar, M., Climate prediction and agriculture: Current status and future challenges, Climate Research, 33(1), 3-17, 2006.
[4]	Kandji S.T., Mackensen, J., and Verchot, L., Climate Change and Variability in the Sahel Region: Impacts and Adaptation Strategies in the Agricultural Sector, Word Agroforestry Centre (ICRAF) and United Nations Environment Programme (UNEP), 58p, 2006.
[5]	Zerbo, l., Caractérisation des stations de recherches agronomiques. Rapport INERA, Ouagadougou, 100p., 1993.
[6]	Thiombiano, L., Etude de l’importance des facteurs édaphiques et pédo-paysagiques, dans le développement de la désertification en zone sahélienne du Burkina Faso. Thèse d’Etat, mention pédologie, Université de Cote d’Ivoire, 208p, 2000.
[7]	Casenave, A. and Valentin, C., A Runoff Capability Classification-System Based on Surface-Features Criteria in Semiarid Areas of West Africa. Journal of Hydrology, 130, 231-249, 1992.
[8]	Casenave, A. and Valentin, C., Les états de surface de la zone sahélienne: Influence sur l’infiltration. Editions de l’ORSTOM, Paris, 229p, 1989.
[9]	Valentin, C., Organisations pelliculaires superficielles de quelques sols de région subdésertique. Dynamique de formation et conséquences sur l’économie en eau. Etudes et Thèses. Editions de l’ORSTOM, 259p, 1981.
[10]	Valentin, C., Poesen, J., Li, Y., Gully erosion: Impacts, factors and control. Catena, 63 (2-3 Special Issues.), 132-153, 2005.
[11]	Podwojewski, P., Orange, D., Jouquet, P., Valentin, C., Nguyen Van, T., Janeau, J.L., Tran Duc, T., Land-use impacts on surface runoff and soil detachment within agricultural sloping lands in Northern Vietnam. Catena, 74: 109-118, 2008.
[12]	Malam-Abdou M., Vandervaere, J-P., Bouzou-Moussa, I., Descroix, L., Mamadou, I., Faran-Maiga O., Genèse des écoulements sur deux petits bassins versants cristallins de l’Ouest du Niger: approche multi-échelles du fonctionnement hydrodynamique. Géomorphologie, 22(4), 363-375, 2016.
[13]	Famiglietti, J.S. and Wood, E.F., Effects of Spatial Variability and Scale on Areally Averaged Evapotranspiration. Water Ressources Research, 31(3), 699-712, 1995.
[14]	Chanzy, A. and BRUCKLER, L., Estimation de l'évaporation à partir d'informations accessibles par télédétection microonde: approches mécaniste, semi-empirique et empirique INRA, Station de Science du Sol, Domaine St Paul, BP 91, F-84143 Montfavet Cedex, Franc., 1991.
[15]	Niang, D., Fonctionnement hydrique de différents types de placages sableux dans le sahel burkinabé. Laboratoire d'hydrologie et aménagements, EPFL, Lausanne, Suisse, thèse n°3667, 167p., 2006.
[16]	Niang, D., Mermoud, A., Yacouba, H., Ribolzi, O., Temporal evolution of the hydrodynamic behaviour of sandy deposits in the Sahelian part of Burkina Faso. Journal of Soil Science and Environmental Management, 3, 297-307, 2012.