Groundwater recharge pathways to a weathered-rock aquifer system in a dryland catchment in Burkina Faso

Rusagara, Radegonde; Koïta, Mahamadou; Plagnes, Valérie; Jost, Anne

doi:10.1007/s10040-022-02506-4

Cited by 9 publications

(3 citation statements)

References 89 publications

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“…Land use/land cover (LULC) change is already known to be affecting the spatial variability of hydraulic properties of soils, especially in the unsaturated zone [7,10,11]. This, in turn, further impacts recharge pathways and processes [12,13].…”

Section: Introductionmentioning

confidence: 99%

“…A better understanding of the impact of LULC changes on deep drainage and groundwater recharge can help with the 2 of 22 development of well-informed policies and decision support strategies to ensure sustainable water supply for populations living in arid and semi-arid areas [14][15][16]. Some evidence of the impact of LULC on surface water resources is already well established [17,18], especially for the case of West African Sahelian hydrosystems [11]; however, the impact of LULC on groundwater recharge is still poorly studied [10,19] and even less so in the Sahelian context.…”

Section: Introductionmentioning

confidence: 99%

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Quantification of Soil Deep Drainage and Aquifer Recharge Dynamics according to Land Use and Land Cover in the Basement Zone of Burkina Faso in West Africa

Kafando

Koïta

Zouré³

et al. 2022

Sustainability

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Groundwater is a vital water supply for local populations and ecosystems globally. With the continuous population growth, the anthropic pressure on groundwater is ever increasing, thus reducing the amount of available water resource. Yet, estimating the impact of anthropogenic activities on aquifer recharge is still a significant challenge for research, especially in basement aquifers. This study aims to improve the actual knowledge of deep drainage and deep aquifer recharge pathways and dynamics in the basement as affected by land use/land cover (LULC). The methodology used in this study accounted for hydraulic processes in soil layers within both unsaturated and saturated zones in an integrated approach. An experimental setup consisting of three (3) experimental plots, respectively under natural vegetation (NV), cropped millet (CM) and cropped groundnut (CG) on which deep drainage was monitored during the years 2020 and 2021. The results show significant differences between the LULC types after two years of implementation. Deep drainage is improved under CM and CG plots located in the central valley, as compared to the NV plot located in the ridge zone. Deep drainage is estimated at 8%, 24% and 25% of the annual rainfall, respectively for NV, CM and CG. The ratio between the recharge value obtained by the water table fluctuation (WTF) method and the deep drainage tends to 1 for the CM and CG plots, highlighting a rapid water transfer between unsaturated and saturated zones. The central valley, which seems to be a preferential recharge pathway, provides promising insights under specific conditions for the implementation of artificial recharge infrastructures.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Quantification of Soil Deep Drainage and Aquifer Recharge Dynamics according to Land Use and Land Cover in the Basement Zone of Burkina Faso in West Africa

Kafando

Koïta

Zouré³

et al. 2022

Sustainability

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“…Croplands are growing cereals (millet, sorghum) in the wet season (early June to mid-October), during which traditional farming practices are carried out on these soils to sustain crop production [Zouré et al, 2019, Yonaba et al, 2021b]. In the watershed, populations are relying of traditional wells (of 15-30 m depth) for water consumption; however, the amounts of such withdrawals are negligible [Rusagara et al, 2022] and were therefore not considered in this study.…”

Section: Lulc Evolution In Tougou Watershedmentioning

confidence: 99%

Future climate or land use? Attribution of changes in surface runoff in a typical Sahelian landscape

Yonaba¹,

Mounirou²,

Fowé³

et al. 2024

Comptes Rendus. Géoscience

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La integración de datos geológicos, hidrogeológicos y geofísicos con el fin de identificar los recursos de aguas subterráneas en zonas de basamento granítico (Macizo de Guéra, Chad)

Nouradine,

Schamper,

Valdes

et al. 2024

Hydrogeol J

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In Chad, hard-rock aquifers are the main source of drinking water for the population located on basement areas. In these basement aquifers, and in particular those of the Guéra region, water drilling failure rates remain high despite research on one- and two-dimensional electrical resistivity techniques and lineaments as a means to improve access to the resource, mainly because these techniques are only used on an observational and structural basis to locate fractures. This study combines electrical resistivity tomography (ERT) with geology, hydrogeology and geomorphology, in order to characterise the structure and geometry of the aquifer system, assess borehole productivity and determine the factors controlling it. After validating the large dataset and its representativeness, 315 high- and low-yield wells, of which 41 have complete geophysical datasets, were selected. This large dataset allows a multi-parameter approach to (1) better characterise each facies according to its electrical resistivity and (2) clearly identify the main formations constituting the local conceptual hydrogeological model. The most suitable areas for productive boreholes are characterised by the presence of an overburden of <20 m depth, well-developed weathered and fractured horizons of granites and biotite granites (preferably) containing little or no clay, and a nearby drainage network. The most substantial flow rates are found in the first 30 m of the fissured horizon, below the base of the alterites. The experience gained from the present study will guide future analysis of ERT sections in order to reduce the probability of drilling dry wells.

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Groundwater recharge pathways to a weathered-rock aquifer system in a dryland catchment in Burkina Faso

Cited by 9 publications

References 89 publications

Quantification of Soil Deep Drainage and Aquifer Recharge Dynamics according to Land Use and Land Cover in the Basement Zone of Burkina Faso in West Africa

Quantification of Soil Deep Drainage and Aquifer Recharge Dynamics according to Land Use and Land Cover in the Basement Zone of Burkina Faso in West Africa

Future climate or land use? Attribution of changes in surface runoff in a typical Sahelian landscape

La integración de datos geológicos, hidrogeológicos y geofísicos con el fin de identificar los recursos de aguas subterráneas en zonas de basamento granítico (Macizo de Guéra, Chad)

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