3 research outputs found
Hydrogeological Parameters and Climate Variability Impacts on Groundwater Availability in M’Bahiakro (Central-East Côte d’Ivoire)
No full textIn the context of increasing climate variability in West Africa, this study analyzes groundwater dynamics in M’Bahiakro in relation to climatic conditions and aquifer characteristics. The data used include daily rainfall (1944–2016), monthly temperatures (1964–2015), and potential evapotranspiration (1971–1998) from the Bouaké station. The methodology combines the analysis of Nicholson indices after seasonal filtering using a Hanning low-pass filter. It also relies on hydrodynamic measurements of hydraulic conductivity, effective porosity, and groundwater flow velocities in four representative districts. The results identify three climatic phases: wet (1944–1972), normal (1973–1996), and dry (1997–2016), which directly influence aquifer recharge. Hydraulic conductivity ranges from 7.1 × 10⁻⁵ to 1.5 × 10⁻⁴ m/s, with permeable zones in N’guattakro and Koko and less permeable zones in Dougouba and Baoulekro. Effective porosity (20–40%) enhances water storage and infiltration in sandy areas but limits flow in clay-rich sectors. Groundwater recharge represents 34.85% of rainfall, while evapotranspiration accounts for 62.07%. Groundwater flow velocities, on the order of 10⁻⁵ m/s, indicate slow circulation and tend to decrease with declining rainfall and rising temperatures. These results highlight that groundwater availability depends on both lithology and climate, emphasizing the need for integrated and sustainable water resource management. They also provide critical information for local planning and climate adaptation, contributing to improved water-resource management in tropical environments
Evaluation of Water Resources in the Confront of Climate Variability in the N’Zi Watershed at M’Bahiakro (Central-East Côte d’Ivoire)
No full textThis study evaluates the availability and management of water resources in the N’Zi watershed at M’Bahiakro, in central-east Côte d’Ivoire, under the influence of climate variability. Water resources play a crucial role in water supply, the development of irrigated rice cultivation, and the preservation of local ecosystems. The analysis is based on rainfall series (1944‑2016) and hydrological data (1960‑2004). Climatic breaks were identified using the Pettitt test and the Lee & Heghinian test. The methods of precipitated and runoff water depths, the recession coefficient, and the volume of water mobilized by aquifers were applied to characterize hydrological dynamics and water availability. The results show significant breaks in 1968, 1973, 1989, and 2005, associated with rainfall deficits (11.7% to 18.8%) and a notable decline in streamflow and volumes mobilized by aquifers. Monthly analysis reveals a strong correlation between precipitation and runoff, with some localized anomalies indicating a complex hydrological response. The recession coefficient highlights a progressive drying of aquifers starting from the 1970s. These changes indicate a particularly high-water vulnerability in M’Bahiakro, which could threaten the sustainability of irrigated rice cultivation, food security, and water availability. Therefore, the study has been carried out to incorporate both historical climate variations and anthropogenic factors in the analysis of water resources, with the aim of ensuring sustainable and secure management of water systems, which is essential for agricultural production and drinking water supply
