ABSTRACT
Development of an ASR scheme involves injecting and recovering water over a number of cycles. A finite difference solute transport model was used to simulate the operation of an ASR scheme in a borehole in a radially symmetrical, single porosity aquifer with no prevailing hydraulic gradient or density differences between injected and background water. Under these conditions, the dispersivity of the aquifer had the greatest effect on recovery efficiency whilst diffusion and permeability had no effect. The effect of other parameters could be summarised by their effect on the radius on the bubble of injected water in the ground (rb); parameter combinations that increased rb led to higher recovery efficiencies. The practice of increasing the volume injected on successive cycles will therefore lead to an over-estimate of the improvements in recovery efficiency over subsequent cycles.
