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Recharge Estimation of Hard Rock Aquifers under Sahelian Climate Conditions Using Water Table Fluctuation:Case Study of Tougou Catchment,Burkina Faso

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Journal of Water Resource and Protection 2017年第12期9卷 1428-1448页

作者： Mahamadou Koita Wennegouda Jean Pierre Sandwidi amagana emmanuel dara Institut International d’Ingenierie de l’Eau et de l’Environnement OuagadougouBurkina Faso Ecole Nationale Superieure d’Ingenieurs de Fada/Universite Ouaga I Professeur Joseph Ki Zerbo OuagadougouBurkina Faso

This study aims to characterize water table fluctuations and estimate groundwater recharge in the Tougou catchment located in the Sahel zone of Burkina Faso. Water table fluctuation and groundwater budget approaches are developed on an experimental site equipped with observation wells. The trends of water fluctuations in the different layers of the weathering profile are similar. There is a time-lag response of groundwater recharge to the daily precipitation occurrences. The interaction between the upper (clayey alteration) and lower (transition zone-fractured schist complex) parts of the weathering profile shows that generally the hydraulic head in the upper part is higher than that of the lower part due to difference in drainage porosity. The latter varies at the catchment scale between 0.006 and 0.009 and is inversely proportional to the saturated thickness of the clayey alteration layer. The groundwater recharge is annually estimated between 36 and 49 mm, which correspond to 6% and 9% of mean annual rainfall in the catchment. Annual evapotranspiration was estimated to be about 223 to 443 mm.

关键词： Recharge Aquifer Specific Yield Water Table Fluctuation WTF Groundwater Budget Sahel Tougou Burkina Faso

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Estimation of Soil Hydrodynamic Parameters Related to Agricultural Practices -Case of the Tougou Experimental Site （Burkina Faso）

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Journal of Environmental Science and Engineering(A) 2017年第10期6卷 527-534页

作者： Dial Niang Mahamadou Koita Amadou Keita Medogbe Christelle Manuela Houndayi Cheick Oumar Zoure amagana emmanuel dara Department of Civil Engineering and Hydraulics. the International Institute for Water and Environmental Engineering Laboratory of Hydrolog v and Water ResourcesRue de la Science-BP 594 Ouagadougou 01 Burkina Faso

This study aims to estimate the hydrodynamic properties of soils under various agricultural practices in the Tougou catchment in northern Burkina Faso. The methodology adopted is based on the determination of the unsaturated hydraulic conductivity and capillary sorptivity close to saturation. This method relies on the measurement of the transient infiltration flux at the soil surface with imposed hydraulic head varying from -60 to -20 mm. These tests are carried out on control, stony line, half-moon and zai plots. The results show a difference in hydrodynamic parameters according to the agricultural practices. The unsaturated hydraulic conductivity is 33.1 cm/h, 13.1 cm/h, 20.3 cm/h and 4.0 cm/h for zai, control, stony line and half-moon plots respectively. The unsaturated hydraulic conductivity is 33.1 cm/h, 13.1 cm/h, 20.3 cm/h and 4.0 cm/h for zai, control, stony line and half-moon plots respectively. The pores participating to water transfer also differ. The mean size of drainable pores is 43.7, 56.2, 22.3 and 87.2 pm on control, stony line, half-moon and zai plots respectively.

关键词： Agricultural practice unsaturated hydraulic conductivity sorptivity soil Tougou Burkina Faso.

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