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- W2023851039 abstract "The Maastrichtian aquifer in the Senegalese sedimentary basin appears completely confined and is characterised by a relatively high geothermal gradient (0.03–0.06°C m−1). In the upper part of the aquifer, temperatures are strongly related to the depth of the roof. At the basin scale, this could mask possible thermal transfer. However, in the SE, thermal anomalies have been observed in some boreholes; moreover, radiocarbon investigations have indicated abnormally long groundwater residence times. Recharge occurs mainly in this zone, near the basement margin, by leakage from the upper aquifer through semi-permeable beds. The natural vertical discharge of the Maastrichtian aquifer occurs beyond the line of equal piezometric level between the upper and lower aquifer. By comparing the aquifer to a porous U-tube and imposing the same input and output, the flow patterns have been studied numerically using the finite element method. Different numerical simulations have involved fluctuations of three quantities: the geothermal gradient, the intrinsic permeability and the input rate. They indicate that, for the mean values observed in the aquifer, natural convection could occur. When the input rate increases, the convective cells have a tendency to break up but significant mixing remains. In such cases, interpretation of residence times with natural isotopes is more difficult." @default.
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- W2023851039 date "1997-01-01" @default.
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- W2023851039 title "Temperatures and thermal gradients in the Senegalese Maastrichtian aquifer: simulated test on their effect on flow discharge" @default.
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- W2023851039 doi "https://doi.org/10.1016/s0022-1694(96)03046-6" @default.
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