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Fractured Gneiss aquifers present a challenge to hydrogeologists because of their geological complexity. Interpretation methods which can be applied to porous media cannot be applied to fractured Gneiss aquifers because flow and transport occur in fractures, joints, and conduits. In contrast, the rock matrix contribution to groundwater flow is not very important in Gneiss aquifers. Sodium chloride was injected into groundwater flow under steady state condition as tracer to determine transport parameters which are needed for transport modeling. QTRACER2 was used to evaluate the tracer test data. Lattice Boltzmann method was applied to simulate flow and tracer transport through a fracture zone in Gneiss. Experimental tracer data and the numerical solution by lattice Boltzmann method are compared. In general, the results indicate that a 2D Lattice Boltzmann model is able to simulate solute transport in fractured gneiss aquifer at field scale level.
State is located in the Niger delta region of Nigeria. The coastal plain sand
aquifer, which underlies the area, is the major source of potable water for
domestic, agricultural, and industrial use. The increase in demand for water
has led to an increased exploitation of the aquifer in the last few years.
Hence it is essential to quantify the amount of exploitable water in the aquifer.
To achieve this goal, a regional numerical groundwater flow model using MODFLOW
was calibrated under steady-state conditions to determine the aquifer’s
hydraulic conductivity (K) and the recharge characteristics of the area. The
hydraulic conductivity and recharge values from the pilot points calibration
ranged from 1 to 75 m/d and 5.89 × 10-6 m3/d to1.23 × 10-4 m3/d. The calculations of
the model showed that the average recharge rate amounts 0.40l/s/km2 or 12.60 mm/year. The estimated recharge suggests a high groundwater potential
for the area. This is the first time that such a study has been carried out in
the area, and it will serve as an important basis for future groundwater
management and simulation of transient groundwater flow modeling in Akwa Ibom