Abstract
A digital simulation model has been presented for the solution of the unsteady-state radial flow to a large-diameter dug well perforating the full saturated thickness of an unconfined aquifer. The numerical solution is based on the finite difference approach. The computational algorithm is an iterative version of the alternating direction implicit method. The time variant discharge from the aquifer, and the reduction in saturated thickness due to water withdrawal during both the abstraction and recovery phases have been suitably incorporated in the simulation model. A sensitivity analysis has been carried out on the model parameters of the aquifer, namely lateral permeability, anisotropy, specific storage and specific yield. The results indicate that the model response of hydraulic heads in the aquifer is mainly sensitive to variations in lateral permeability and specific yield alone. The simulation model has also been applied to analyse data from well pumping tests. The particular combination of parameters characterizing the aquifer at the test-site have been identified by a parameter adjustment procedure.
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