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3 Result(s) for 'Ngounou Ngatcha Benjamin'
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1.
Use of Geological and Hydrogeochemical Data to Investigate Depressed Aquifers in the Southern Part of Lake Chad Basin (LCB), Cameroon
MVONDO Valentin, KEMGANG DONGMO TCHOUTA, FAVREAU Guillaume, Ngounou Ngatcha Benjamin
American Journal of Water Resources. 2018 6 (4). doi: 10.12691/ajwr-6-4-4
Keywords: lake chad, cameroon, depressed aquifers, geology, hydrogeochemistry
Context: Depressed aquifers highlighted on the Cameroon border of Lake Chad have not yet been closely studied. The purpose of this work is to improve the knowledge of these depressions by combining a dataset derived from geology and hydrochemistry. To do this, a field campaign was conducted. During this campaign, static levels and physicochemical parameters (pH, temperature, electrical conductivity and turbidity) were measured. Groundwater sampling was also carried out. This study shows that piezometric levels decrease from the edge to the central part of the depression, regardless of the flow line. Ph vary from 7.09 to 7.80, temperatures from 21.70°C to 24.50°C and conductivities from 181.66 μs/cm to 3446.66 μs/cm with the highest values in the depression; the mineralization is done within the aquifer. Two water facies: calcic/magnesic bicarbonate facies (87.5%) and sodic/potassic bicarbonate facies (12.5%) were noted. This facies change is due to substitutions within the clay formations and dissolution of evaporitic minerals. The different litho-stratigraphic logs show a heterogeneous aquifer of which the formations could not be correlated.
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2.
Contribution of Piezometry and Hydro-Geochemistry to a Better Understanding of the Adamawa-Yadé Hard Rock Aquifer System in Ngaoundéré
Tamonkem Adzeh Roger, Kemgang Dongmo Tchouta, Mvondo Valentin Yvan Emmanuel, Iwoudam Maïvow Edmond, Ngounou Ngatcha Benjamin
American Journal of Water Resources. 2024 12 (2). doi: 10.12691/ajwr-12-2-2
Keywords: hard-rock aquifer, hydrodynamic, water-mineralization, water-quality, Ngaoundere
Context: The hard rock-aquifer system in the urban context of Ngaoundere was investigated using piezometric measurements and hydro-chemistry to enhance understanding of its functioning and assess groundwater suitability for drinking and domestic purposes. Seasonal and intra-seasonal piezometric monitoring was conducted in different localities, along with chemical analysis of thirty-five ground and surface water samples. The chemical composition was determined for major elements was determined using ion chromatography, and water facies and mineralization processes were assessed using Piper and Gibbs diagrams. The water quality index (WQI) was calculated to evaluate groundwater suitability for human consumption. The findings revealed diverse piezometric behaviors depending on well/borehole geomorphological positions and seasons. Wells situated on hilltops exhibited high piezometric fluctuations, while those in valleys near rivers showed low fluctuations due to support from river water levels. Recharge occurred during the rainy season through direct infiltration from hilltops, with stream water levels influencing piezometric levels in surrounding wells and boreholes. The surface and ground waters exhibited low mineralization, characterized by calcium-magnesium bicarbonate and sodic-potassic bicarbonate facies. Water-rock interactions and dilution with rainwater were identified as the main processes controlling water mineralization. According to the WQI, all groundwater samples were classified as "excellent quality water" for human consumption. However, the microbiological quality of groundwater in and around Ngaoundere was influenced by human activities, making it unsuitable for drinking without treatment.
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3.
Piezometric Modelling of a Hard Rock Aquifer System in An Intertropical Zone: The Case of the Batouri Mining District (South-East Cameroon)
Djangue Moustapha Bouba, Badoga David, Kenyane Samaki Emile, Tamonkem Adzeh Roger, Iwoudam Maivow Edmond, Kemgang Dogmo Tchouta, Ngounou Ngatcha Benjamin
Journal of Geosciences and Geomatics. 2024 12 (2). doi: 10.12691/jgg-12-2-2
Keywords: modelling, piezometry, hydrodynamics, hard rock aquifer, batouri, cameroon
Context: The economic growth of Batouri and the surrounding area has considerably increased the population. This situation has led to a high demand of water, which much of it is met at the hard rock aquifer system. However, understanding the hydrodynamic functioning of this system remains unveil, which has turn a challenge for water management in the region, due to mining and agricultural activities that is being practised there. To overcome the consequences of these activities, a study was carried out using the modelling technique, by exploiting the linear correlation among the levels of the ground surface and the water table surface, with the thalwegs base surface; in order to map the geometry of the water table over an area of 189 km2. The data used includes boreholes data sheets, field measurements (static and dynamic levels) and a digital elevation model (DEM). The water table elevation deduced from the mathematical model were compared with those measured on the field; this has been revealing a variation of ±1.43 metres. This variation at the scale of the study and the non-synchronous conditions of the measurements is largely acceptable. The comparison indicates satisfactory consistency between the modelled and the observed data, reinforcing the validity of the model. The water table map obtained highlights the presence of numerous domes and reveals a groundwater flow pattern that follows the topography, draining towards surface water. Although the inverse relationship between groundwater and surface water was not clearly established at the study’s scale, it is interesting to note that the hydrological and hydrogeological catchment areas coincide, suggesting a close connection between the two systems. These results provide a solid basis for understanding groundwater flow in the Batouri area. They are essential for scientists and water managers, as they will enable more integrated management of water resources, taking into account the region's expanding economic activities.
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